Integration of Multiple Heterointerfaces in a Hierarchical 0D@2D@1D Structure for Lightweight,Flexible,and Hydrophobic Multifunctional Electromagnetic Protective Fabrics

The development of wearable multifunctional electromagnetic protective fabrics with multifunctional,low cost,and high efficiency remains a challenge.Here,inspired by the unique flower branch shape of“Thunberg’s meadowsweet”in nature,a nanofibrous composite membrane with hierarchical structure was constructed.Integrating sophisticated 0D@2D@1D hierarchical structures with multiple heterointerfaces can fully unleash the multifunctional application potential of composite membrane.The targeted induction method was used to precisely regulate the formation site and morphology of the metal–organic framework precursor,and intelligently integrate multiple heterostructures to enhance dielectric polarization,which improves the impedance matching and loss mechanisms of the electromagnetic wave absorbing materials.Due to the synergistic enhancement of electrospinning-derived carbon nanofiber“stems”,MOF-derived carbon nanosheet“petals”and transition metal selenide nano-particle“stamens”,the CoxSey/NiSe@CNSs@CNFs(CNCC)composite membrane obtains a minimum reflection loss value(RL_(min))of-68.40 dB at 2.6 mm and a maximum effective absorption bandwidth(EAB)of 8.88 GHz at a thin thickness of 2.0 mm with a filling amount of only 5 wt%.In addition,the multi-component and hierarchical heterostructure endow the fibrous membrane with excellent flexibility,water resistance,thermal management,and other multifunctional properties.This work provides unique perspectives for the precise design and rational application of multifunctional fabrics.

Review on carbon storage estimation of forest ecosystem and applications in China

Background:The accuracy in estimating forest ecosystem carbon storage has drawn extensive attention of researchers in the field of global climate change.However,incomparable data sources and various estimation methods have led to significant differences in the estimation of forest carbon storage at large scales.Methods:In this study,we reviewed fundamental types of forest carbon storage estimation methods and their applications in China.Results:Results showed that the major forest carbon storage estimation methods were classified into 3 major categories and 15 subcategories focusing on vegetation carbon storage estimation,soil carbon storage estimation,and litter carbon storage estimation,respectively.The application in China showed that there have been 3 development stages of research in China since the 1990s.Studies of forest carbon storage estimation in province scales were conducted more frequently in the northeastern,eastern and southwestern provinces such as Zhejiang,Heilongjiang and Sichuan with high forest coverage or large forest area.Inventory-based methods,soil type method,and biomass model were the main forest estimation methods used in China,focusing on vegetation,soil and litter carbon storage estimation respectively.Total forest carbon storage of China was approximate 28.90 Pg C,and the average vegetation carbon density(42.04±5.39 Mg·ha?1)was much lower than that of the whole world(71.60 Mg·ha?1).Vegetation carbon density from average biomass method was the highest(57.07 Mg·ha?1)through comparing nine types of vegetation carbon storage estimation methods applied during 1989 to 1993.Conclusions:Many studies on forest carbon storages have been carried out in China at patch scales or regional scales.These efforts enabled the research of forest carbon storage to reach a relatively advanced stage.Meanwhile,the accumulation of massive research data provides the basis for subsequent research work.Some challenges are also existing.This review could provide a reference for more accurate estimation of forest carbon storage in the future.

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Layered double hydroxides(LDHs)have a special structure and atom composition,which are expected to be an excellent electromagnetic wave(EMW)absorber.However,it is still a problem that obtaining excellent EMWabsorbing materials from LDHs.Herein,we designed heterostructure NiCo-LDHs@ZnO nanorod and then subsequent heat treating to derive NiCo@C/ZnO composites.Finally,with the synergy of excellent dielectric loss and magnetic loss,an outstanding absorption performance could be achieved with the reflection loss of−60.97 dB at the matching thickness of 2.3 mm,and the widest absorption bandwidth of 6.08 GHz was realized at 2.0 mm.Moreover,this research work provides a reference for the development and utilization of LDHs materials in the field of microwave absorption materials and can also provide ideas for the design of layered structural absorbers.

Fine-scale activity patterns of large-and medium-sized mammals in a deciduous broadleaf forest in the Qinling Mountains,China

The composition of animal species and interactions among them are widely known to shape ecological communities and fine-scale(e.g.,<1 km)monitoring of animal communities is essential for understanding the relationships among animals and plants.Although the co-existence of large-and medium-sized species has been studied across different scales,research on fine-scale interactions of herbivores in deciduous broadleaf forests is limited.Camera trapping of large-and medium-sized mammals was carried out over a 1 year period within a 25 ha deciduous broadleaf forest dynamics plot in the Qinling Mountains,China.Fourteen species of large-and medium-sized mammals,including six carnivores,six ungulates,one primate and one rodent species were found.Kernel density estimations were used to analyse the diel or 24 h activity patterns of all species with more than 40 independent detections and general linear models were developed to explore the spatial relationships among the species.The combination of overlapping diel activity patterns and spatial associations showed obvious niche separation among six species:giant panda(Ailuropoda melanoleuca David),takin(Budorcas taxicolor Hodgson),Reeves’s muntjac(Muntiacus reevesi Ogilby),tufted deer(Elaphodus cephalophus Milne-Edwards),Chinese serow(Capricornis milneedwardsii David)and wild boar(Sus scrofa Linnaeus).Long-term fine-scale monitoring is useful for providing information about the co-existence of species and their interactions.The results demonstrate the importance for fine-scale monitoring of animals and plants for improving understanding of species interactions and community dynamics.

Highly Durable Ag-CuO Heterostructure-Decorated Mesh for Efficient Oil/Water Separation and In Situ Photocatalytic Dye Degradation

It is of great necessity yet still a challenge to develop superwetting functional interfacial materials for simultaneously separating insoluble oil and degrading soluble dye pollutants in practical wastewater.In this work,a Ag-CuO heterostructure-decorated mesh was fabricated via facile alkali etchingcalcination and photoreduction approaches.The as-synthesized mesh with superhydrophilicity and underwater superoleophobicity displayed high separation efficiency(>99.998%)for diverse oil/water mixtures.Besides,it demonstrated more superior photocatalytic performance in dye degradation than those of bare CuO nanostructure-coated materials,which is primarily attributed to the intensive visible light harvesting and efficient electron-holes separation occurred on noble metal-semiconductor heterostructures.Furthermore,on account of the tenacity of Cu substrate as well as enhanced structural stability,this binary composite-decorated mesh exhibited highly reliable durability and robustness after 10 cycles of photocatalytic degradation tests,and even being ultrasonic worn for 30 min.More importantly,our developed mesh was capable of in situ catalytic degrading water-soluble organic dyes during oil/water separation under visible light irradiation.Therefore,such a dexterous and feasible strategy may afford a new route to construct bifunctional and predurable materials for actual sewage purification.

Construction of NiCeO_(x) nanosheets-skeleton cross-linked by carbon nanotubes networks for efficient electromagnetic wave absorption

In this work,two-dimensional NiCeOx nanosheet-modified carbon nanotubes(CNTs)composites were prepared by a hydrothermal method.NiCeOx with different morphologies can be formed by adjusting the addition ratio of nickel salt and cerium salt,and the introduction of CNTs in the subsequent synthesis process can effectively prevent the aggregation of NiCeOx nanosheets.Microstructural studies show that hexagonal NiCeOx nanosheets with a size of 100 nm are uniformly intertwined with CNTs.When applied to the attenuation of electromagnetic waves,NiCeOx/CNTs composites exhibit better electromagnetic wave(EMW)absorption performance than pure CNTs and NiCeOx nanosheets due to improved impedance matching and multiple polarization relaxation.At the matching thickness of 1.9 mm,the composite exhibits a minimum reflection loss(RL_(min))of–53.2 dB and an effective absorption bandwidth(RL<–10 dB)of 5.04 GHz with a thickness of 2.3 mm.These results indicate that the as-prepared NiCeOx/CNTs composites have excellent EMW absorption performance and are expected to be a candidate material for EMW absorption.

Characteristics of the three-dimensional deep electrical structure in the Helan Mountains-Yinchuan Basin and its geodynamic implications

Located in the north segment of the North-South seismic belt where the Alxa block(AB)and the Ordos block(OB)contact,the Helan Mountains-Yinchuan Basin(HLM-YCB)constitutes a typical normal faulting basin-mountain structure on the Chinese mainland.The 1739 M8.0 Pingluo earthquake occurred in the Yinchuan fault depression basin with such a basinmountain structure.Data on five magnetotelluric profiles encompassing distinct segments of the HLM-YCB were utilized for three-dimensional(3D)joint inversion in order to collect fine 3D electrical structure information at a crustal and upper mantle scale across the entire region.The electrical structure between the main blocks in the HLM-YCB and adjacent areas is characterized by east-west horizontal blocks OB,YCB,and HLM,which are divided by the Yellow River fault(F5)with the HLM eastern piedmont fault(F2)as electrical boundary zones on the east and west sides.The two main block units,AB and OB,exhibit an obvious layered resistivity structure.Besides,the HLM-YCB is characterized by a typical basin-mountain structure with the mountains as a high-resistivity body and the basin as a low-resistivity body,and in the northern YCB a large-scale lowresistivity structure exists,extending to the upper mantle,probably derived from the upwelling of mantle-derived materials.It is speculated from a combination of recent 3D crustal movement field information and other data that the HLM-YCB is an active tectonic zone formed via regional tensile action.The formation of the HLM-YCB lies in the interaction of the Tibetan Plateau(TP),AB,and OB and abnormal mantle activities beneath the YCB.The HLM-YCB reflects the joint action of upwelling and diffluence caused by the underplating of hot materials from the deep mantle with gravity and the redistribution of regional tectonic stress on the earth’s surface,which may be the main dynamic reason for the 1739 M8.0 Pingluo earthquake.

Catalytic oxidation of vinyl chloride over Co-Ce composite oxides derived from ZIF-67 template:Effect of cerium incorporation

Transition metal oxides are regarded as an economical and efficient catalytic alternate for catalytic oxidation of volatile organic compounds(VOCs)emissions.The morphological decoration and the incorporation of extrinsic metals were demonstrated to be effective strategies for achieving noticeable catalytic improvement.In this work,a novel Co-Ce composite oxides catalyst was obtained by the pyrolysis of ZIF-67 template with the impregnation of certain cerium cations(denoted as ZIF-CoCe).Compared with the reference Co-Ce composite oxides by the sol-gel(denoted as SG-CoCe)and physical mixing(denoted as MIX-CoCe)methods,ZIF-CoCe delivers significantly higher catalytic activity for vinyl chloride oxidation,which are demonstrated to be closely related with its superior redox capacity,more abundance of surface active Co^(3+)sites and adsorbed active oxygen species from oxygen vacancies.In addition,the unique cage-like morphological feature of the Co-based catalysts derived from ZIF-67 template plays a crucial function in kinetically facilitating the mass transfer of catalytic reaction and promoting the catalytic VC oxidation activity.With regard to in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTs)analysis,enol and carboxylic acid species are identified to be the key organic intermediates during catalytic vinyl chloride oxidation.

关于社会保险费费基的国际比较及经验借鉴

《中共中央关于深化党和国家机构改革的决定》指出,“将基本养老保险费、基本医疗保险费、失业保险费等各项社会保险费交由税务部门统一征收”。为有效借鉴其他国家(地区)对社会保险费进行征收管理的成熟经验,为我国下一步社会保险制度的深化改革提供有益参考,本文选取11个国家和地区,对其社会保险费费基管理的相关内容进行了统计与对比分析,并针对当前我国社会保险费费基管理方面存在的问题,提出了相关改革建议。

秦岭中段野生动物多样性的红外相机监测数据库平台介绍

秦岭地处我国中西部,生物地理位置重要,拥有丰富的生物多样性,有大熊猫(Ailuropoda melanoleuca)、秦岭羚牛(Budorcas bedfordi)、金丝猴(Rhinopithecus roxellana)和朱鹮(Nipponia nippon)等4个秦岭森林旗舰物种,被称为"秦岭四宝"。利用红外相机技术开展秦岭野生动物的非损伤性监测不仅可以为秦岭山系提供物种名录信息,还可以为了解秦岭野生动物的行为和活动格局提供科学数据。清华大学环境学院生态团队自2009–2020年在秦岭中段南坡先后实施了7个项目,对秦岭南坡的4个保护区进行了野生动物监测,面积达1,113 km2(26.5 km×42 km),红外相机位点数267个,相机日数152,160天,共获取红外相机照片855,260张。共鉴定出27种野生兽类和63种野生鸟类,并应用这些照片数据开展了信息挖掘工作,对野生动物行为、稀有物种、与生境的关系,以及人为活动对野生动物的影响等领域进行了研究,已取得部分成果。在此基础上建立了"秦岭中段野生动物多样性的红外相机监测数据库平台",供团队内部及合作者使用。通过10年的监测,我们提出未来研究建议:(1)对于非常偶见的物种,还需要更长的时间并在更多样化的生境布设相机,以获取更多影像数据评估其现状;(2)数据库需要在更大程度和深度上进行信息挖掘,尤其在种间关系、物种–生境关系、种群动态等方面;(3)对典型大种群数量的物种(如秦岭羚牛和野猪Sus scrofa)及食物链顶端大型捕食动物(如金钱豹Panthera pardus)进行种群动态研究,为整个秦岭生态系统的健康持续提供科学支撑;(4)利用数据库的数据及今后红外相机监测数据进行野生动物疾病的发生发展监测研究。

高压氧治疗对中重度至极重度突发性聋患者血清神经元特异性烯醇化酶的影响

目的:探讨中重度至极重度突发性聋患者血清神经元特异性烯醇化酶(NSE)的变化特点及高压氧(HBO)治疗对其的影响,并分析不同治疗后患者听力恢复与血清NSE水平的关系。方法:采用方便抽样法选取单侧中重度至极重度突发性聋住院患者90例为研究对象,按随机数字表法分为观察组和对照组,每组45例。对照组接受激素、银杏叶注射液及营养神经等治疗,观察组在对照组治疗的基础上联用HBO治疗。治疗前及治疗20 d进行纯音测听以获得听力水平,采用酶联免疫吸附法测定血清NSE水平。比较2组患者治疗有效率、NSE变化及与听力变化水平的关联。结果:突发性聋患者血清NSE水平高于健康对照,且与听力下降水平相关( P<0.01);极重度患者血清NSE水平高于中重度和重度患者( P<0.01)。治疗后,观察组临床有效率(82.2%)高于对照组(60.0%)( P<0.05);2组患者听力均较治疗前提高,且观察组纯音听阈均值低于对照组( P<0.05)、听阈增益高于对照组( P<0.01);2组患者NSE水平均下降,观察组NSE水平低于对照组( P<0.05)、NSE下降值大于对照组( P<0.01)。2组患者血清NSE下降值与听阈增益值均呈正相关(观察组 r=0.686, P<0.01;对照组 r=0.418, P<0.01)。 结论:中重度至极重度突发性聋患者血清NSE水平升高,且与听力下降的严重程度有关,而治疗后NSE下降值与听阈增益相关。联用HBO治疗可改善患者听力、提高治疗有效率、降低突聋患者血清NSE水平。

Water quality monitoring in a slightly-polluted inland water body through remote sensing-Case study of the Guanting Reservoir in Beijing,China

This study focused on the water quality of the Guanting Reservoir,a possible auxiliary drinking water source for Beijing.Through a remote sensing(RS)approach and using Landsat 5 Thematic Mapper(TM)data,water quality retrieval models were established and analyzed for eight common water quality variables,including algae content,turbidity,and concentrations of chemical oxygen demand,total nitrogen,ammonia nitrogen,nitrate nitrogen,total phosphorus,and dissolved phosphorus.The results show that there exists a statistically significant correlation between each water quality variable and remote sensing data in a slightly-polluted inland water body with fairly weak spectral radiation.With an appropriate method of sampling pixel digital numbers and multiple regression algorithms,retrieval of the algae content,turbidity,and nitrate nitrogen concentration was achieved within 10% mean relative error,concentrations of total nitrogen and dissolved phosphorus within 20%,and concentrations of ammonia nitrogen and total phosphorus within 30%.On the other hand,no effective retrieval method for chemical oxygen demand was found.These accuracies were acceptable for the practical application of routine monitoring and early warning on water quality safety with the support of precise traditional monitoring.The results show that performing the most traditional routine monitoring of water quality by RS in relatively clean inland water bodies is possible and effective.

Hierarchical composite of biomass derived magnetic carbon framework and phytic acid doped polyanilne with prominent electromagnetic wave absorption capacity

To solve the electromagnetic pollution,herein,a CoFe_(2)O_(4)/C/PANI composite was developed by a green route,which was constructed with spinel of metal oxide,graphitized carbon and conductive polymer composites.Benefiting from the designable interfaces and increased dipoles,the microwave dielectric response capability can be boosted significantly and resulted in the enhanced microwave absorbing performance.As revealed by the reflection loss curve,the minimum reflection loss(RLmin) reached-51.81 dB at 12.4 GHz under a matched thickness of 2.57 mm.At 2.5 mm,the effective absorbing band covered 8.88 GHz,suggesting the desirable wideband feature.In our case,the method of utilization of a novel green way to fabricate multiple-component EM absorber can be a promising candidate for high-performance EM absorber.

Synthesis of MnxOy@C hybrid composites for optimal electromagnetic wave absorption capacity and wideband absorption

The fabrication of high-performance electromagnetic(EM)wave absorption(EMA)materials is an effective strategy to deal with ever-increasing EM pollution.In this work,a series of manganese oxides/porous carbon(Mn_(x)O_(y)@C)hybrid composites are obtained by a two-step process.It is revealed that different manganese oxides play various influence on the dielectric properties of absorbers.Owing to the moderate complex permittivity of MnO@C hybrid composites,the optimal reflection loss could reach as high as-76.0 dB at the matching thickness of 2.0 mm with 5.2 GHz of effective absorption bandwidth at thickness of 2.1 mm.We demonstrated that the addition of porous carbon is vital for enhancing EMA performance of composites,which not only coordinates impedance matching allowing more EM waves enter the absorber,but also provides the path for electron movement,thus profiting conductive loss.Besides,different heterogeneous interfaces including porous carbon,manganese oxide and so on,are conducive to contribution of interface polarization.The most noteworthy is ingenious design of composite materials and systematic research of EM energy attenuation mechanism in this work will provide the possibility to realize high-performance EMA.

Controllable synthesis of Ni/NiO@porous carbon hybrid composites towards remarkable electromagnetic wave absorption and wide absorption bandwidth

The reasonable design of the composition of the composite materials is of great significance to optimized the electromagnetic(EM)wave absorption performance.Herein,the Ni/NiO@C hybrid composites with tunable Ni proportion were successfully synthesized through a two-step process.With the assistance of X-ray diffraction with refinement treatment,the specific proportion of Ni of as-obtained hybrid composites could be obtained.Employing controlling calcination time to adjust the Ni content of Ni/NiO@C hybrid composites,it has been found that the composite carbonized at 500℃exhibited remarkable EM wave absorption with the minimum reflection loss(RLmin)of-49.1 dB at 4.9 mm and the widest effective absorption bandwidth(EABmax)of 4.56 GHz at 2.1 mm.Moreover,by adjusting the Ni source,the optimal EM wave absorption performance could be achieved.Results illustrated that the N3PC with the Ni proportion of 13.17%showed the RLm inas low as-51.1 dB at 2.4 mm and the EABmax was 5.12 GHz at 2.7 mm.It is worth noting that this work demonstrates the relevance of the composition and EM wave absorption performance of hybrid composites,which offers a feasible reference for the absorption mechanism of absorber.

PdPb bimetallic nanowires as electrocatalysts for enhanced ethanol electrooxidation

Less-expensive but efficient electrocatalysts are essential to accelerate the commercialization of fuel cells.Herein,ultrathin PdPb nanowires(PdPb NWs)with a diameter of around 3.5 nm were prepared by using a one-step hydrothermal method.The introduction of Pb in Pd-based bimetallic nanostructures produced high differences in the morphology from Pd nanoparticles(NPs)to various PdPb NWs.All the as-prepared PdPb NWs exhibited better electrocatalytic activity and durability than Pd NPs due to the synergistic effect.Especially,Pd65Pb35 possessed the highest current density of about 3460 mA mgPd^−1 for the ethanol electrooxidation which was around 6.3 times higher than commercial Pd/C.The high-performance of Pd65Pb35 is attributed to the defect-rich and stable nanowire structure with optimized surface atomic arrangement,as evidenced by high resolution transmission electron microscopy measurements and long-time treatment in an acidic media.The differences in the morphologies and electrocatalytic activities of PdPb NWs with varied Pb contents have also been discussed and analyzed.

Copper and zinc interaction on water clearance and tissue metal distribution in the freshwater mussel,Cristaria plicata,under laboratory conditions

Copper and zinc interaction on clearance from water and distribution in different tissues was investigated for the freshwater mussel,Cristaria plicata,under laboratory conditions.Clearance rate of Cu or Zn from water was highly dependent on exposure concentration.Interaction effect was most evident at 300μg·L^(-1) Cu exposure and depressed the Zn clearance rate significantly(p<0.05).However,the presence of 100μg·L^(-1) and 300μg·L^(-1) Zn hardly affected the Cu clearance rate.The 300μg·L^(-1) Cu presence enhanced Cu accumulation in each tissue most significantly(p<0.01),but caused Zn content to decrease in the gills by 62%(p<0.05),viscera by 49%(p<0.05)and foot by 31%(p<0.05),and increase in the mantle by 97%(p<0.05)and the muscles by 243%(p<0.05)for different Zn exposure treatments.The response of metal accumulation in various tissues of the test mussels indicated that Zn transferred from the gills,viscera and foot to the mantle and muscles might be one of the important characteristics of the Zn regulatory mechanism by leading to a narrow range of Zn concentration in the different tissues.

Improvement of electrocatalytic alcohol oxidation by tuning the phase structure of atomically ordered intermetallic Pd-Sn nanowire networks

Atomically ordered intermetallic compounds(OICs)have aroused remarkable interests for wide applications and are considered as very promising materials for electrocatalysis owing to the strict stoichiometry,well-defined atom binding environment,and the specific crystalline phase.However,the tunable synthesis of the intermetallics remains a giant challenge.Herein,this study reports the preparation of the Pd-Sn OICs composed of an interconnected nanowire network structure with adjustable molar ratios of elements Pd and Sn.The co-reduction of Pd(acac)_(2) and SnCl_(2)·2H_(2)O in ethylene glycol(EG)in the presence of sodium hypophosphite(NaH_(2)PO_(2))as the reducing agent affords OICs of three phases:hexagonal Pd_(3)Sn_(2-)P6_(3)/mmc,orthorhombic PdSn-Pnmb,and orthorhombic PdSn_(2)-Aba_(2).Also,the pure phase can convert to two mixed phases(Pd_(3)Sn_(2)/PdSn and PdSn/PdSn_(2))by just altering the feed ratio.It is found that orthorhombic PdSn-Pnmb OIC has a large electrochemically active surface area(ECSA),excellent electrocatalytic performance(4857 mA mg_(Pd)^(−1)),and outstanding stability toward ethanol oxidation reaction(EOR),which could be attributed to its optimal electronic structure.These results demonstrate that the phase engineering of OICs with desired components is an excellent way for catalysts design.

Evaluating and structuring indicators for wetland assessment

Wetland assessment has been a popular field of research worldwide.However,various indicators have been used in wetland assessment for different purposes and backgrounds and also because of the research limitations.Therefore,a more comprehensive,sound,and efficient indicator system is needed for researchers’referencing to evaluate wetlands.After an extensive review of wetland assessment literatures,the reported indicators were evaluated using the developed assessment system,based on the Analytical Hierarchy Process(AHP)with three main goals:nature protection,function utilization,and sustainable development.Each indicator was evaluated using two methods.The first method was to study the percentage of the indicator application,and the second was to assess the weighted ratios assigned to the indicators according to principles of comparability,typicality,sensibility,and availability.The results of these two methods were compared to study the commonalities and specialties of the indicators.They also showed that some indicators were widely used,including biodiversity,weather and climate,hydrological change,and the output of wetland.On the other hand,other sustainable indicators were easily ignored,such as environmental carrying capacity and wetland planning.Furthermore,an indicator system for wetland assessment was structured and strategized to discuss how to choose indicators for wetland assessment under different conditions.The proposed approach can be used to guide the process of wetland assessments in the future.

Evaluation of ecosystem health for regional development in the southwestern Beijing,China

Ecosystem health assessment is one of the most important issues in regional ecological quality and safety studies.It also has a great significance to ecological conservation and regional development.This study focused on assessing the health status of forest,agriculture and urban ecosystems in the southwestern Beijing,China,including the Fangshan and Fengtai Districts.Based on field surveys and data collection,an assessment index system containing the vigor,organization and resilience factors was developed to measure the ecosystem health.Each index was scored from 1 to 5,representing five levels that contribute to the whole ecosystem health.The analytic hierarchy process(AHP)method was used to measure the weights of each index and three factors,and thus an overall score for a certain ecosystem was calculated.The results show that the forest ecosystem in the Fangshan District had higher health value than the Fengtai District,while the urban ecosystem had a slightly lower value in the Fangshan District than the Fengtai District.Both districts show lower resilience values in forest and urban ecosystems.Maintaining the ecosystem health will definitely benefit the long-term development of two districts.This study suggested that an approach for assessing the regional ecosystem health could be further developed to address spatial and synergy relationships between ecosystems and the three health factors.