Study on Rural Domestic Waste Treatment in Loess Plateau Region——Taking Longfang Town in Shaanxi Province as Example

With the continuous development of economy and changes in people’s lifestyle,rural domestic waste brought about serious harm to water,air,human health,ecological landscape and so forth.In this paper,taking Longfang Town in Loess Plateau region as example,the source,amount and harms of rural domestic waste were analyzed firstly,as well as the current situation and existing problems of treatment,and then a suitable waste disposal technology for the town was chosen,finally the reasonable treatment methods combining new countryside and non-new countryside with township was summed up,so as to realize the reduction,harmless and resource treatment of rural domestic waste.

Study on the Climate Changes Characteristics in the Hilly Region of the Loess Plateau and Its Influence on Agricultural Production

[Objective] The aim was to study the climate changes characteristics in the hilly region of the loess plateau and its influence on agricultural production.[Method] Taking Yan’an City as an example,and by dint of temperature and precipitation in nine meteorological stations from 1957 to 2007 and accumulated anomaly curve,linear regression and relevant analysis,the climate changes characteristics in 51 years in Yan’an were expounded.The climate changes in the hilly region of the loess plateau were studied and its influences on agricultural production were concluded.[Result] The characteristics of climate changes in the hilly region were as follow:high temperature in winter and warm winter trend was clearly;the temperature in spring enhanced fast and the drought disaster was increasing worse;rainy days occurred now and then in autumn.The climate changes had different levels of influences on agricultural production in Yan’an City.Because of rising temperature in winter,facility agriculture was vigorously developed and the apple range expanded;in the meantime,because of rising temperature in spring,drought was worsen and sowing in spring can not proceed;constant rain in autumn damaged the quality of date.[Conclusion] The study provided theoretical basis for the regional agricultural production and agricultural structure adjustment.

Land-use changes in the small watershed of the Loess Plateau,hilly-gully region, China

As more and more farmland is converted to forestry, the need for effective decision support regarding the use of land in the fragile ecological environment of the Loess Plateau hilly-gully area. The Luoyugou watershed was chosen as the study area to calculate the single dynamic degree, integrated dynamic degree, and change indexes of land use, as well as the land-use type transition matrix. This was done by interpreting the TM and SPOT images of the Luoyugou watershed in 1986, 1995, and2004 and making statistical analysis. The results of ou statistical analysis show that the conversion of slope farm land to terrace and forest land plays a dominant role in land-use changes in the Luoyugou watershed from 1986 to2004. The land-use changes are mainly driven by popula tion growth, socio-economic development, consume spending, and investment in forest ecology.

Dynamic Land Use /Cover Change and Analysis of Landscape Pattern in the Hilly and Gully Region of Loess Plateau: A Case Study of Pengyang County in Southern Ningxia

The quantitative evaluation on land use /cover change as well as its influence on landscape pattern under the background of returning grain plots to forestry is significant to the sustainable utilization of land resources and ecological environment reconstruction in the southern Ningxia.Based on multi-temporal remote sensing data from four periods of Landsat TM /ETM,and combination of ecological quantity analytical method with GIS,the change of land use /cover and landscape pattern in Pengyang County of Ningxia Province were analyzed.The conclusions showed that the amount of each land use type was changed with different degrees,the area of forest /grass land increased,while farmland and unused land decreased.The change of landscape pattern was characterized as that the degree of landscape fragmentation,mixed distribution of patches,diversity index and evenness index increased gradually and then decreased,the connectivity between patches decreased gradually and then increased,and landscape shape presented irregular.

Autumn Daily Characteristics of Land Surface Heat and Water Exchange over the Loess Plateau Mesa in China

The Loess Plateau, located in northern China, has a significant impact on the climate and ecosystem evolvement over the East Asian continent. In this paper, the preliminary autumn daily characteristics of land surface energy and water exchange over the Chinese Loess Plateau mesa region are evaluated by using data collected during the Loess Plateau land-atmosphere interaction pilot experiment （LOPEX04）, which was conducted from 25 August to 12 September 2004 near Pingliang city, Gansu Province of China. The experiment was carried out in a region with a typical landscape of the Chinese Loess Plateau, known as ＂loess mesa＂. The experiment＇s field land utilizations were cornfield and fallow farmland, with the fallow field later used for rotating winter wheat. The autumn daily characteristics of heat and water exchange evidently differed between the mesa cornfield and fallow, and the imbalance term of the surface energy was large. This is discussed in terms of sampling errors in the flux observations-footprint; energy storage terms of soil and vegetation layers; contribution from air advections; and low and high frequency loss of turbulent fluxes and instruments bias. Comparison of energy components between the mesa cornfield and the lowland cornfield did not reveal any obvious difference. Inadequacies of the field observation equipment and experimental design emerged during the study, and some new research topics have emerged from this pilot experiment for future investigation.

Vegetation and environmental changes in western Chinese Loess Plateau since 13.0 ka BP

Pollen records from the Chinese Loess Plateau revealed a detailed history of vegetation variation and associated climate changes during the last 13.0 ka BP. Before 12.1 ka BP, steppe or desert-steppe vegetation dominated landscape then was replaced by a coniferous forest under a generally wet climate （12.1-11.0 ka BP）. The vegetation was deteriorated into steppe landscape and further into a desert-steppe landscape between 11.0 and 9.8 ka BP. After a brief episode of a cool and wet climate （9.8-9.6 ka BP）, a relatively mild and dry condition prevailed during the early Holocene （9.6-7.6 ka BP）. The most favourable climate of warm and humid period occurred during mid-Holocene （7.6-4.0 ka BP） marked by forest-steppe landscape and vegetation alternatively changed between steppe and desert-steppe from -4.0 to -1.0 ka BP.

Dynamic Simulation of Land Use in the Southern Loess Plateau

To study the dynamic changes of land use and predict the future land use scenarios based on the current land use,this paper uses Cellular Automata- Markov( CA- Markov) model to simulate the landscape pattern in 2030. The results show that in the study area during the period 1980- 2005,grassland and construction land increased,and woodland increased slightly; waters and unused land decreased,and arable land underwent dramatic changes. The simulation precision of CA- Markov model is 87. 28%,indicating that the use of it for simulation is reliable. The land use of the study area will be changed greatly in the future. This method provides a reference for the regions to carry out land prediction,and the research results can provide a basis for the study of optimization of land.

THE SYSTEMATIC DYNAMIC EMULATION ON THE AGRICULTURAL DEVELOPMENT ON THE LOESS PLATEAU

The Loess Plateau, covered with thick loess, lies in the middle reaches of the YellowRiver to the west of the Taihangshan Mountains, east of the Wuqiao Mountains south ofYinshan Mountains and north of the Qinling Mountains with a total area of 56×10~4km^2.The plateau is 1000--2500m above sea level and has loess as thick as 100--200 metres, be-

Review on Regional Climate Change Induced by Qinghai-Tibet Plateau Uplift

[Objective]The aim was to study the influence of Qinghai-Tibet Plateau uplift on regional climate in China.[Method] Trough relevant study of Qinghai-Tibet Plateau and its surrounding movement,the tectonic movement of the Qinghai-Tibet Plateau and its surrounding areas,especially the case of the impact caused by plateau phased uplift were studied based on paleomagnetic measurements.[Result]The increasing Qinghai-Tibet Plateau led to obvious transition from dry to cold in northwest China and it became dry quickly,which led to loess accumulation,replacement of vegetation types and human activity.Meanwhile,it was dry,and there was certain degree of climate changes in the area.[Conclusion] Qinghai-Tibet Plateau had far-reaching significance on basic climate characteristics in northwest China.

黄土高原河谷城镇“川—沟”融合单元发展路径研究

通过分析黄土高原河谷城镇独特的城乡关系与发展困境,认为川道与次沟空间结构一体化、功能结构差异化发展是振兴黄土高原丘陵沟壑区的重要突破口,由此提出“川—沟”融合单元的概念内涵与划定方法。以榆林市绥德县为例,打破镇域行政边界和小流域镇村体系,基于川道城镇和次沟乡镇的空间关联关系划定10个融合单元,并从用地形态结构、产业经济地理、服务设施配置等方面对融合单元的空间构型、功能类型和服务水平进行剖析,探讨川道与次沟协同视角下以融合单元为抓手推动黄土高原河谷城镇高效发展和管控治理的新路径。

2005-2019年陕西长武农田生态系统国家野外科学观测研究站气象数据集

陕西长武农田生态系统国家野外科学观测研究站(长武站)所在区域代表了黄土高塬沟壑区的典型农田,在研究站内设置气象自动观测系统对气象要素进行长期定位观测,对该区气候变化背景下农田生态系统水、土、气、生过程研究具有重要意义。本数据集对2005–2019年长武站的原始气象数据进行处理、质量控制和评估,对大气温度、相对湿度、降水量、大气压、总辐射、反射辐射、紫外辐射、净辐射、光合有效辐射、日照时数和各土层土壤温度(0 cm、5 cm、10 cm、15 cm、20 cm、40 cm、60 cm和100 cm)18项气象观测指标,以180条月尺度和15条年尺度的格式进行信息公开,以期为黄土高原沟壑区农业生态研究、天气灾害预警和气候生产潜力模拟等提供基础数据支撑。

文化保护与乡村振兴协同的杨家沟建设规划研究

以杨家沟为代表的一类特殊乡村具有红色文化资源丰富但地处偏远、对外交通不便、产业基础薄弱、土地资源紧缺等特征,长期面临红色文化资源保护与乡村振兴的双重压力.基于乡村地域系统理论与评估框架,诊断杨家沟乡村子系统发展水平及问题,结果表明:杨家沟乡村子系统呈两极化发展水平,虽然红色文化资源丰富、历史文化底蕴深厚,但在生态环境脆弱、土地资源紧缺、遗产保护要求约束的影响下,该村农业和旅游业难以充分发展,导致人口外流、产业空心化、经济发展缓慢,进一步加剧遗址维护人员及资金短缺、遗址保护管理不善等问题.对此,规划提出“红色文化+X”的发展模式,形成文化遗产带动红色旅游、红色旅游反哺遗产保护、促进乡村振兴的良性循环,并采用“枝状网络分形”的空间布局,解决遗址环境保护与旅游产业发展、移民搬迁安置的潜在用地冲突.

黄土高原近30年降水集中度分析及时空演变特征

选取近30年的黄土高原地区58个气象站点的降水数据,分析了黄土高原年降水以及降水集中度(PCD)和集中期(PCP)的时空变化特征,结果表明:(1)黄土高原地区年均降水量在50~900 mm,空间分布上东南高西北低。降水高值区分布在三门峡站与武功站附近以及五台山站,年均降水量为900 mm;低值区位于临河站附近,年均降水量为50 mm;(2)黄土高原地区的降水集中度分布于0.43~0.76,自东南向西北递增;而降水集中期的变化则不太明显,多集中于夏季的7-8月份。因此在降水集中的7-8月份,水土流失会比较加重,应加强水土流失防治工程,在降水量大的月份做好灾害防护,为工农业生产提供预警,减少工农业生产损失与经济损失。

双螺孔型重建板前路双关节融合术治疗黄土高原地区晚期踝大骨节病

目的探讨双螺孔型重建板前路双关节融合术治疗黄土高原地区晚期踝大骨节病的疗效。方法采用双螺孔型重建板前路双关节融合术治疗36例黄土高原地区晚期踝大骨节病患者。记录手术情况、疼痛VAS评分、AOFAS踝-后足评分以及并发症发生情况。结果患者均获得随访,时间6~20(9.4±2.2)个月。手术时间50~60(55.0±5.0)min。切口均一期愈合,术后未发生断钉、断板等并发症。疼痛VAS评分及AOFAS踝-后足评分:术后6个月、末次随访时均较术前改善(P<0.05)。末次随访时,X线片显示踝关节植骨均融合,患侧外观正常,患肢行走无明显不适感;采用AOFAS踝-后足评分评价疗效:优30例、良6例,优良率100%。结论采用双螺孔型重建板前路双关节融合术治疗黄土高原地区晚期踝大骨节病,术中能够充分处理关节面,实现坚强固定,术后能够较好地恢复和维持踝关节的矫形位置,并发症少,疗效满意。

黄土高原和六盘山区的林水协调多功能管理

【目的】面对实施黄河流域生态保护和高质量发展重大国家战略、推进“山水林田湖草”系统治理的国家要求,黄土高原等旱区的林业发展和植被恢复必须改变传统方式,增加考虑水资源的限制和对水资源的影响,关注森林的多种功能优化,探索如何克服长期存在的忽视水资源承载力、造林成活率低和生长不良、减少河川径流危及区域供水安全、整体功能低下等问题,实现森林多功能性的整体提升。【方法】针对深入理解林水关系和进行森林多功能管理的科技需求,自2000年以来在黄土高原的泾河流域和作为黄土高原区域重要水源地的六盘山土石山区,围绕“结构”、“格局”、“过程”、“耦合”、“尺度”等关键内容,在从单株到区域的多个空间尺度上,采用观测对比、统计分析、模型模拟等多种手段,长期开展旱区森林生态水文和多功能管理研究。【结果】1)林业高质量发展的本质是森林多功能优化的定量精准管理,为此需深入理解和准确量化立地环境与林分结构对多种功能形成的影响,在考虑多种功能的相互作用和供需关系基础上明确各功能的重要性差异,通过科学设计和合理调控森林的数量、质量(结构)和空间格局而权衡优化相互竞争的多种功能,在保证森林本身稳定的前提下尽可能同时满足对主导功能及其他功能的需求。2)提出了旱区林水协调多功能管理的实现途径,即在管理决策时除继续考虑可造林土地面积、立地质量、可用造林苗木等限制外,增加水资源管理及多功能管理的决策内容,并嵌入到传统的森林单功能经营决策过程中,这涉及流域森林覆盖率(造多少?)、森林空间分布(在哪造?)、植被类型和树种组成(造什么?)、林分结构(怎么管?)4个决策层。3)按决策层梳理总结了相关技术成果,在确定黄土区流域合理森林覆盖率方面,将仅考虑年降水量限制的潜在森林覆盖率提升为同时考虑降水量与产流要求限制的合理森林覆盖率,这可藉助于有关统计关系及率定过的流域水文模型模拟;在确定流域内的森林合理空间分布方面,提出相关决策需增加考虑立地类型的产流差别及其造林响应,这可借助于分布式流域水文模型模拟结果或研发的区域植被承载力计算系统;在林分尺度的森林多功能管理方面,提出了5个决策步骤,即进行立地质量分类、确定各地类的主要功能及优先性、调查现有林分结构特征、诊断现有林分的结构与功能、编制面向结构与功能的管理计划;为给森林多功能管理提供参照和目标,提出了不同详细程度的多功能水源林理想结构,包括表示为“3×0.7+X”的一般化理想结构(郁闭度0.7左右,0.6~0.8;地表覆盖度0.7以上;林木高径比0.7 m/cm以下,至少不超过0.9;X表示其他要求)、通过权衡多种功能和林分稳定的需求而确定的华北落叶松中龄林多功能合理密度、基于主要功能的变化规律和重要性排序而确定的不同海拔和林龄时的华北落叶松林多功能合理密度。【结论】本文证实了林水协调多功能管理的理论先进性和技术可行性,是旱区林业高质量发展的可行途径。通过深入认识和定量分析森林多种功能的变化规律,结合应用本文提出的管理技术,就可以科学设计和合理调节森林的数量(覆盖率)、质量(结构)和分布格局,整体提升森林的多种功能,更好地满足社会发展需求。但是,现有成果还有局限性,仍需针对各地情况开展更多理论与技术研究,助力“山水林田湖草”生命共同体治理及黄河流域生态保护和高质量发展。

陕北黄土高原无资料地区洪水特征值分位数估算方法研究

数据短缺是制约陕北黄土高原区科学防御洪水灾害的关键性因素,探索数据短缺区域的洪水特征值分位数估算方法具有科学意义。以榆林市28个水文站点的实测最大一日流量(MDF)的分位数为响应变量,以集水面积、淤地坝控制面积、水文站点的经纬度等12个指标为解释变量,研究了线性CCA与非线性NLCCA两种同质区域识别方法与线性MLR和非线性GAM两种区域水文分位数估计方法交叉耦合所形成的4种区域洪水频率分析模型的估算效能,并评价了其在陕北黄土高原的适用性。结果显示,NLCCA-GAM凭借其非线性优势,相比其他耦合模型(CCA-MLR、NLCCA-MLR、CCA-GAM)具有更高的精度和鲁棒性,可作为陕北黄土高原无资料地区洪水特征值分位数的最优估计方法。

黄土高原地区4种常见树种适宜区对气候变化响应

【目的】分析黄土高原地区4个常见树种(樟子松、油松、柠条、华北落叶松)在当前和未来的潜在分布,揭示气候变化对植物空间分布格局的影响。【方法】基于19个气候因子结合来自Ho1dridge生命地带模型和Kira指标体系的5个指标:年生物温度(ABT)、潜在蒸散率(PER)、温暖指数(WI)、寒冷指数(CI)、干燥指数(HI),运用Maxent模型,模拟预测了4个树种在当前、未来(2041-2060年、2061-2080年)ssp126、ssp245、ssp585气候情景下的潜在地理分布。运用刀切图分析影响其分布的主要环境因子,并采用受试者工作特征曲线(ROC)下的面积(AUC)对预测结果进行检验。【结果】(1)Maxent模型可以较好地模拟黄土高原4个主要常见种的地理分布范围,各物种的10次平均AUC结果均大于0.8;(2)对于樟子松、油松、柠条来说,温度和水分共同限制其分布,而对于华北落叶松来说,影响其分布的主导因子是降水。温度季节性变化标准差、潜在蒸散率、最湿润季节降雨量、最干燥月降水都影响樟子松分布。年均温变化范围、温度季节性变化标准差、最冷月最低温度,最暖季度降水量、潜在蒸散率是影响油松分布的主导因子。影响柠条适宜区分布的主导因子为最暖月最高温度、温暖指数、等温性和潜在蒸散率、最冷季度降水量。影响华北落叶松分布的主导因子主要与降水有关,分别是最湿润月降雨量、最湿润季节降雨量、降水量变异系数和潜在蒸散率。(3)油松、柠条和华北落叶松的潜在适生区将向西北方向迁移,樟子松的潜在适生区向西南方向迁移。油松和华北落叶松的潜在适宜区面积呈现先扩大后缩小的趋势,而柠条和樟子松的潜在适生区将持续扩张,尤其是樟子松的高适生区占比将在2070s扩大至50.97%。【结论】气候变化将使油松和华北落叶松丧失一部分的高适生区,但同时会使柠条和樟子松的高适生区扩张明显。在黄土高原退耕还林建设中,可优先考虑种植柠条和樟子松。

黄土高塬沟壑区植被恢复方式对小流域土壤水分的影响

研究植被自然恢复和人工造林不同恢复方式下的土壤水分特性,对于揭示退耕还林(草)的长期水土保持生态效应具有重要的科学价值。本文基于黄土高塬沟壑区西峰水土保持科学试验站长达60多年的董庄沟(自然恢复草地)和杨家沟(人工造林)对比小流域,分析对比小流域土壤理化性质及土壤体积含水率的差异,阐明特定气候条件下植被自然恢复和人工造林2种不同植被恢复方式下流域的土壤持水能力。结果表明:(1)人工造林植被恢复方式下杨家沟小流域0~100 cm的土壤密度和土壤孔隙度分别是植被自然恢复的董庄沟的91.9%和1.1倍,土壤有机质质量分数和阳离子交换量分别高于董庄沟21.4%和22.6%,表层土壤理化性质未表现出差异性,不同植被恢复方式对持水能力的影响更多表现在深层土壤;(2)相同降雨条件下,董庄沟0~80 cm土层土壤体积含水率较降雨前平均增加8.85%,总量蓄水增加71.7 mm;杨家沟0~80 cm平均增加12.74%,总量蓄水增加102.1 mm;(3)董庄沟土壤体积含水率对降雨事件响应迅速,而杨家沟土壤水分随土层深度增加滞后现象明显。黄土高塬沟壑区西峰水土保持试验站经过60多年长期的植被恢复后,人工造林的杨家沟土壤持水能力要优于植被自然恢复的董庄沟。

陇东黄土高原农田生态系统服务及其权衡协同关系

陇东黄土高原是中国农耕文明发祥地之一,探究其农田生态系统服务及其权衡协同关系对于维持农田生态系统多功能性,促进耕地保护、保障粮食安全具有重要价值。为了厘清其农田生态系统服务之间的权衡协同关系,该研究基于社会经济与资源环境数据,运用降水贮存量法、通用土壤流失方程、InVEST等6种生态系统服务评估模型,测算2020年农田生态系统供给服务(食物供给)、调节服务(水源涵养、碳固存)、支持服务(土壤保持、生境维持)和文化服务(美学景观)的物理量,并采用皮尔逊相关系数、双变量莫兰指数,分别识别供给服务与其他3类服务之间的权衡协同关系、各项服务之间关系的空间异质性。结果表明:1)研究区农田生态系统食物供给、水源涵养、碳固存、土壤保持服务物质量分别为4.61×10^(6)t、2.45×10^(8)m^(3)、2.94×10^(6)t、6.61×10^(9)t,生境质量服务均值为0.26;供给服务与文化服务均呈“东西高、中北低”的分布格局,调节服务与支持服务则呈“带状”分布格局。2)研究区农田生态系统供给服务与调节、支持、文化服务之间以及食物供给服务与水源涵养、碳固存、土壤保持、生境维持、美学景观服务之间均表现为不同程度的协同关系。3)研究区农田生态系统4类服务之间、各项子服务之间的权衡协同关系均具有空间自相关性,空间异质性显著。各项服务之间的协同关系“组团”出现在陇东中北部地区,聚集性较明显;各项服务之间的权衡关系则零散分布,聚集性不明显。因此,应全力维持陇东黄土高原农田生态系统多功能性,实施分区管理策略,充分发挥农田生态系统各类服务的协同效应,整体提升农田生态系统服务功能(特别是食物供给服务),巩固新时代“陇东粮仓”地位。

黄土高原水蚀风蚀交错区固氮微生物群落多样性在生物结皮中的演变规律

生物土壤结皮在黄土高原的水土保持、养分补给等方面发挥着重要生态功能。固氮微生物是固氮过程的关键功能群,影响着土壤氮素平衡,然而黄土高原水蚀风蚀交错区严重的水土流失导致土壤养分大量损失,尤其是氮素。该区域生物结皮广泛发育,它们在干旱半干旱区土壤氮素积累过程中起着重要作用。但是该区域生物结皮不同发育阶段中的固氮潜力、固氮微生物群落多样性及其关键环境控制因子尚不清楚。以黄土高原水蚀风蚀交错区为研究区,三种生物结皮类型和裸地对照为研究对象,采用Illumina HiSeq平台对nifH基因扩增产物进行生物信息学分析,揭示了固氮潜力及微生物群落多样性的分布规律。结果表明,生物结皮演替显著影响固氮酶活性、nifH基因丰度和固氮微生物α-多样性,各值均在苔藓结皮最高,显著高于其它演替阶段,且生物结皮层高于结皮下层土壤。在固氮微生物群落组成上,裸地以变形菌门的红螺菌目、酸硫杆菌目和根瘤菌目为主;而在藻结皮、地衣结皮和藓结皮阶段,均表现为蓝藻门的念珠藻目占绝对优势,是固氮微生物的关键类群,其中Trichormus、念珠藻属是优势固氮物种;与藻结皮、地衣结皮相比,藓结皮中念珠藻目的相对丰度显著降低,而变形菌门的红螺菌目、酸硫杆菌目和根瘤菌目的丰度明显上升。除此之外,蓝杆藻属、鱼腥藻属、斯克尔曼氏菌属、瘤胃梭菌属在藻结皮、地衣结皮、藓结皮也占明显优势。念珠藻目以及Trichormus的丰度与固氮酶活性、nifH基因丰度呈显著正相关关系,而与红螺菌目、酸硫杆菌目、梭菌目、根瘤菌目呈显著负相关;Trichormus相关的物种在黄土高原生物结皮氮输入过程中可能发挥着关键作用。生物结皮演替通过改变土壤pH值、有机质、全氮、含水量等理化特征而影响了微生境,通过环境筛选和物种重排作用对固氮微生物群落进行综合调控,其中pH与土壤全氮(TN)发挥着关键作用。