Sub-Recent Sexual Populations of Limnocythere inopinata Recorded for the First Time from>3500 m Altitude on the Tibetan Plateau

The central and northwestern Tibetan Plateau region,also called＂Qiangtang Plateau＂（30°27＇25＂-35°39＇13＂N,83o41＇14＂-95°10＇46＂E）,is the highest and largest arcticalpine area of the Earth covering approximately 600,000km^2 with altitude ranging from 4600 to 5100 m a.s.l.（Song et al.,2012,Fig.1）.

The Relevant Analysis on the Stop Time in Winter and Times of Plateau and the Index in Early Days for Garrisonned Plateau Constructors

Objective: Study the influence of the stop time in winter, times of plateau on the index in early days for plateau constructors meet;Method:Is it participate in plateau construction of 2002-2004 to choose,enter into the plateau again of 2003-2005 practise clothes finish to mate 326 materials “physical examination in front of the worker",which is passed in Nanshankou Hospital in early days, divided into 3 groups according to the difference of year for the physical examination, examine by leaning towards relevant analytical methods;Result: （1） In the situation of day controlling about the stop time in winter, times of garrison in plateau and blood and oxygen saturation lever （SaO2）, the systolic pressure （sBP） is presented and shouldered relevantly winter to control. Present positive correlation with the value of hemoglobin （Hb）;（2） It is stopped that in case of controlling and is garrisoned in the number of times of plateau in winter day and blood and oxygen saturation lever （SaO2） to present positive correlation. Present and shoulder with the hemoglobin （Hb） relevantly.Conclusion: In order to ensure the health of plateau constructors to the maximum extent, should try one’s best to reduce the number of times of returning to the plateau in possible cases. At the same time each one constructs for year and returns to the time that the hinterland concentrates rest should be on above 90 days.

Impact of time lags on diurnal estimates of canopy transpiration and canopy conductance from sap-flow measurements of Populus cathayana in the Qinghai–Tibetan Plateau

Recently, canopy transpiration （Ec） has been often estimated by xylem sap-flow measurements. However, there is a significant time lag between sap flow measured at the base of the stem and canopy transpiration due to the capacitive exchange between the transpiration stream and stem water storage. Significant errors will be introduced in canopy conductance （gc） and canopy transpiration estimation if the time lag is neglected. In this study, a cross-correlation analysis was used to quantify the time lag, and the sap flowbased transpiration was measured to pararneterize Jarvistype models of gc and thus to simulate Ec of Populus cathayana using the Penman-Monteith equation. The results indicate that solar radiation （Rs） and vapor pressure deficit （VPD） are not fully coincident with sap flow and have an obvious lag effect; the sap flow lags behind Rs and precedes VPD, and there is a 1-h time shift between Eo and sap flow in the 30-min interval data set. A parameterized Jarvis-type gc model is suitable to predict P. cathayana transpiration and explains more than 80% of the variation observed in go, and the relative error was less than 25%, which shows a preferable simulation effect. The root mean square error （RMSEs） between the predicted and measured Ec were 1.91×10^-3 （with the time lag） and 3.12×10^-3cm h^-1 （without the time lag）. More importantly, Ec simulation precision that incorporates time lag is improved by 6% compared to the results without the time lag, with the mean relative error （MRE） of only 8.32% and the mean absolute error （MAE） of 1.48 × 10^-3 cm h^-1.

Time Sequence of Himalayan Endogenetic Mineralization on the East Side of the Qinghai-Tibet Plateau

Among the endogenetic deposits in the Sanjiang area and at the west margin of the Yangtze platform, Himalayan deposits are the most important and contribute a large proportion of the resources of superlarge deposits. Among the controlled resources of this region, 84% of copper resources, 67% of Pb-Zn, 31% of Ag, 77% of gold and 24% of tin come from Himalayan deposits on the east side of the Qinghai-Tibet plateau. Himalayan endogenetic mineralization shows a relatively complete sequence evolution in the Sanjiang area and on the west margin of the Yangtze platform. Mineralization is manifested by gold deposits related to K-rich lamprophyre, REE deposits related to alkalic complexes and Cu-Au-polymetallic deposits related to alkaline porphyry. Six sequences of mineralization evolution since 65 Ma B.P. in the Sanjiang area and on the west side of the Yangtze platform can be recognized. Himalayan endogenetic mineralization on the east side of the Qinghai-Tibet plateau reached its peak before the Oligocene, corresponding to episodes I and II of the intracontinental orogenic cycle. Afterwards, mineralization waned obviously.

VARIATION OF d δ^(18)O/dT IN PRECIPITATION IN THE QINGHAI-XIZANG PLATEAU

The relations between δ18O and temperature on the different time scales were analysed,according to the data from Tuotuohe (34°13’N, 96°25’E; 4533 m a. s. l. ), Delingha (37°22’N,97°22’E; 2981 m a. s. l. ) and Xining (36°37’N, 101°46’E; 2261 m a. s. l. ) in the Qnghai-Xizang Plateau. The results show that the significance of d δ18O/dT on different time scales are different.The d δ18O/dT on the synoptic scale reflects the interdependent relation between δ18O and temperature in the short-term synoptic scale process; the d δ18O/d T on the seasonal scale reflects the relation between them whithin a year; and the d δ18O/d T on the climatic scale reflects the relation between them in the long-term climatic change. The calculated d δ18O/dT on climatic scale is very close to the theoretical values on the condition of advection transport for Tuotuohe Station. However, there are great differences between the calculated and the theoretical values for Delingha and Xining stations.

Soil water response to precipitation in different microtopographies on the semi-arid Loess Plateau,China

Soil water is an important factor restricting afforestation on the semi-arid Loess Plateau.The microtopography of the loess slope has changed the distribution pattern of soil water on the slope.To improve water utilization efficiency and optimize afforestation configuration patterns,the relationship between soil water and precipitation at micro-topographic scale must be studied.We used time series analysis to study the temporal variation of soil water and its response to precipitation in four kinds of micro-topographies and undisturbed slope on loess slopes.Micro-topographies significantly influenced soil water distribution and dynamics on the slopes.Soil water stored in the platform,sinkhole,and ephemeral gully influenced subsequent soil water for 4 weeks,whereas soil water stored in the scarp and undisturbed slope could influence soil water for 2 weeks.It took 12 weeks,10 weeks,18 weeks,6 weeks,and 12 weeks for precipitation to reach the deeper soil layer in the platform,sinkhole,scarp,ephemeral gully,and undisturbed slope,respectively.These soil water characteristics in different micro-topographies are vital factors that should be taken into consideration when undertaking afforestation on the Loess Plateau.

Isotope implications of groundwater recharge,residence time and hydrogeochemical evolution of the Longdong Loess Basin,Northwest China

Groundwater plays a dominant role in the eco-environmental protection of arid and semi-arid regions.Understanding the sources and mechanisms of groundwater recharge,the interactions between groundwater and surface water and the hydrogeochemical evolution and transport processes of groundwater in the Longdong Loess Basin,Northwest China,is of importance for water resources management in this ecologically sensitive area.In this study,71 groundwater samples(mainly distributed at the Dongzhi Tableland and along the Malian River)and 8 surface water samples from the Malian River were collected,and analysis of the aquifer system and hydrological conditions,together with hydrogeochemical and isotopic techniques were used to investigate groundwater sources,residence time and their associated recharge processes.Results show that the middle and lower reaches of the Malian River receive water mainly from groundwater discharge on both sides of valley,while the source of the Malian River mainly comes from local precipitation.Groundwater of the Dongzhi Tableland is of a HCO3-Ca-Na type with low salinity.The reverse hydrogeochemical simulation suggests that the dissolution of carbonate minerals and cation exchange between Ca^(2+),Mg^(2+)and Na+are the main water-rock interactions in the groundwater system of the Dongzhi Tableland.Theδ^(18)O(from-11.70‰to-8.52‰)andδ2H(from-86.15‰to-65.75‰)values of groundwater are lower than the annual weighted average value of precipitation but closer to summer-autumn precipitation and soil water in the unsaturated zone,suggesting that possible recharge comes from the summer-autumn monsoonal heavy precipitation in the recent past(≤220 a).The corrected 14C ages of groundwater range from 3,000 to 25,000 a old,indicating that groundwater was mainly from precipitation during the humid and cold Late Pleistocene and Holocene periods.Groundwater flows deeper from the groundwater table and from the center to the east,south and west of the Dongzhi Tableland with estimated migration rate of 1.29-1.43 m/a.The oldest groundwater in the Quaternary Loess Aquifer in the Dongzhi Tableland is approximately 32,000 a old with poor renewability.Based on theδ^(18)O temperature indicator of groundwater,we speculate that temperature of the Last Glacial Maximum in the Longdong Loess Basin was 2.4℃-6.0℃ colder than the present.The results could provide us the valuable information on groundwater recharge and evolution under thick loess layer,which would be significative for the scientific water resources management in semi-arid regions.

Classification of Vegetation in North Tibet Plateau Based on MODIS Time-Series Data

Based on the 16d-composite MODIS （moderate resolution imaging spectroradiometer）-NDVI（normalized difference vegetation index） time-series data in 2004, vegetation in North Tibet Plateau was classified and seasonal variations on the pixels selected from different vegetation type were analyzed. The Savitzky-Golay filtering algorithm was applied to perform a filtration processing for MODIS-NDVI time-series data. The processed time-series curves can reflect a real variation trend of vegetation growth. The NDVI time-series curves of coniferous forest, high-cold meadow, high-cold meadow steppe and high-cold steppe all appear a mono-peak model during vegetation growth with the maximum peak occurring in August. A decision-tree classification model was established according to either NDVI time-series data or land surface temperature data. And then, both classifying and processing for vegetations were carried out through the model based on NDVI time-series curves. An accuracy test illustrates that classification results are of high accuracy and credibility and the model is conducive for studying a climate variation and estimating a vegetation production at regional even global scale.

Return to sport following tibial plateau fractures: A systematic review

AIM To systemically review all studies reporting return to sport following tibial plateau fracture, in order to provide information on return rates and times to sport, and to assess variations in sporting outcome for different treatment methods.METHODS A systematic search of CINAHAL, Cochrane, EMBASE, Google Scholar, MEDLINE, PEDro, Scopus, SPORTDiscus and Web of Science was performed in January 2017 using the keywords "tibial", "plateau", "fractures", "knee", "athletes", "sports", "non-operative", "conservative", "operative", "return to sport". All studies which recorded return rates and times to sport following tibial plateau fractures were included. RESULTS Twenty-seven studies were included: 1 was a randomised controlled trial, 7 were prospective cohort studies, 16 were retrospective cohort studies, 3 were case series. One study reported on the outcome of conservative management(n = 3); 27 reported on the outcome of surgical management(n = 917). Nine studies reported on Open Reduction Internal Fixation(ORIF)(n = 193), 11 on Arthroscopic-Assisted Reduction Internal Fixation(ARIF)(n = 253) and 7 on Frame-Assisted Fixation(FRAME)(n = 262). All studies recorded "return to sport"rates. Only one study recorded a "return to sport" time. The return rate to sport for the total cohort was 70%. For the conservatively-managed fractures, the return rate was 100%. For the surgically-managed fractures, the return rate was 70%. For fractures managed with ORIF, the return rate was 60%. For fractures managed with ARIF, the return rate was 83%. For fractures managed with FRAME was 52%. The return rate for ARIF was found to be significantly greater than that for ORIF(OR 3.22, 95%CI: 2.09-4.97, P < 0.001) and for FRAME(OR 4.33, 95%CI: 2.89-6.50, P < 0.001). No difference was found between the return rates for ORIF and FRAME(OR 1.35, 95%CI: 0.92-1.96, P = 0.122). The recorded return time was 6.9 mo(median), from a study reporting on ORIF.CONCLUSION Return rates to sport for tibial plateau fractures remain limited compared to other fractures. ARIF provides the best return rates. There is limited data regarding return times to sport. Further research is required to determine return times to sport, and to improve return rates to sport, through treatment and rehabilitation optimisation.

Pollen records and time scale for the RM core of the Zoige Basin, northeastern Qinghai-Tibetan Plateau

A continuous pollen record from the Zoige Basin in the northeastern Qinghai-Tibetan Plateau not only provides information on the vegetation and climate changes during the last two glacial/interglacial cycles, but also gives proof to establish the time scale of the upper 60 m of the RM core. Subalpine spruce-fir forests colonized the Zoige Basin during the interglacials and interstadials, implying warm and wet climate conditions. Alpine periglacial desert or dry desert may have existed during the penultimate glacial and the last glacial maxima, respectively. Alpine sedge meadow dominated the landscape during MIS 4. The MIS 3 is punc- tuated by a number of stadials similar to those documented in the Guliya and GISP2 ice cores, as indicated by repeated rise and fall of subalpine spruce-fir forests. Our pollen re- cord reveals a regional climate history similar to those from the neighboring sites, including the Arabian Sea and the Guliya ice core, and thus supports the notion that the Qing- hai-Tibetan Plateau acts as an important link between cli- matic events in the North Atlantic realm and the Asian mon- soon domain.

The time and energy signals,counter plateau,energy resolution and gas gains performances of a new kind of micro-pattern gaseous detector-Micromegas

In present paper,a new Micromegas detector is developed,and its time and energy signals are obtained in the figure form.The rising time of fast time signal is less than 2 ns due to the very fast collection of avalanche electrons,and the rising time of the energy pulse is about 100 ns,which is corresponding to the total collecting time of the electrons and ions in the avalanche process.The counter plateau,energy resolution and the gas gains of the detector have been compared with other groups' experimental results and the Garfield simulation result.

MODULATION OF MADDEN-JULIAN OSCILLATION ON TIBETAN PLATEAU VORTEX

This study uses NCEP/NCAR daily reanalysis data,NOAA outgoing long-wave radiation(OLR) data,the real-time multivariate MJO(RMM) index from the Australian Bureau of Meteorology and Tibetan Plateau vortex(TPV)data from the Chengdu Institute of Plateau Meteorology to discuss modulation of the Madden-Julian Oscillation(MJO)on the Tibetan Plateau Vortex(TPV).Wavelet and composite analysis are used.Results show that the MJO plays an important role in the occurrence of the TPV that the number of TPVs generated within an active period of the MJO is three times as much as that during an inactive period.In addition,during the active period,the number of the TPVs generated in phases 1 and 2 is larger than that in phases 3 and 7.After compositing phases 1 and 7 separately,all meteorological elements in phase 1 are apparently conducive to the generation of the TPV,whereas those in phase 7 are somewhat constrained.With its eastward propagation process,the MJO convection centre spreads eastward,and the vertical circulation within the tropical atmosphere changes.Due to the interaction between the mid-latitude and low-latitude atmosphere,changes occur in the baroclinic characteristics of the atmosphere,the available potential energy and eddy available potential energy of the atmosphere,and the circulation structures of the atmosphere over the Tibetan Plateau(TP) and surrounding areas.This results in significantly different water vapour transportation and latent heat distribution.Advantageous and disadvantageous conditions therefore alternate,leading to a significant difference among the numbers of plateau vortex in different phases.

High-frequency climatic fluctuations over the past 30 ka in northwestern margin of the East Asian monsoon region, China

Whether millennial-to centennial-scale climate variations throughout the Holocene convey universal climate change is still widely debated.In this study,we aimed to obtain a set of high-resolution multi-proxy data(1343 particle size samples,893 total organic carbon samples,and 711 pollen samples)from an alluvial-lacustrine-aeolian sequence based on an improved age-depth model in the northwestern margin of the East Asian monsoon region to explore the dynamics of climate changes over the past 30 ka.Results revealed that the sequence not only documented the major climate events that corresponded well with those reported from the North Atlantic regions but also revealed many marked and high-frequency oscillations at the millennial-and centennial-scale.Specifically,the late stage of the last glacial lasting from 30.1 to 18.1 cal.ka BP was a dry and cold period.The deglacial(18.1-11.5 cal.ka BP)was a wetting(probably also warming)period,and three cold and dry excursions were found in the wetting trend,i.e.,the Oldest Dryas(18.1-15.8 cal.ka BP),the Older Dryas(14.6-13.7 cal.ka BP),and the Younger Dryas(12.5-11.5 cal.ka BP).The Holocene can be divided into three portions:the warmest and wettest early portion from 11.5 to 6.7 cal.ka BP,the dramatically cold and dry middle portion from 6.7 to 3.0 cal.ka BP,and the coldest and driest late portion since 3.0 cal.ka BP.Wavelet analysis results on the total pollen concentration revealed five substantially periodicities:c.5500,2200,900,380,and 210 a.With the exception of the c.5500 a quasi-cycle that was causally associated with the Atlantic meridional overturning circulation,the other four quasi-cycles(i.e.,c.2200,900,380,and 210 a)were found to be indirectly causally associated with solar activities.This study provides considerable insight into the dynamic mechanism of the Asian climate on a long-time scale and future climatic change.

“赶工游戏”对外卖骑手不安全驾驶的影响:基于压力认知评价的视角

为有效防范外卖骑手不安全驾驶行为,减少由外卖骑手引发的交通安全事故,基于外卖平台“赶工游戏”的工作机制,结合压力认知评价理论,从安全态度和示范性规范角度,构建时间压力和竞争氛围感知对外卖骑手不安全驾驶行为影响的理论模型;向全国各地的外卖骑手发放问卷并收集有效样本360份,通过SPSS 27.0和AMOS 24.0数据分析软件分析数据的可靠性,并利用Process 4.0进行层次回归分析验证理论模型。结果表明:时间压力和竞争氛围感知可以显著正向影响不安全驾驶行为;安全态度可以显著负向影响外卖骑手不安全驾驶行为;安全态度可以介导时间压力与不安全驾驶行为的关系,也能介导竞争氛围感知与不安全驾驶行为的关系;示范性规范可以正向调节安全态度与不安全驾驶行为的关系。

时频电磁技术在黄土塬覆盖区河道砂油藏分布预测中的应用

鄂尔多斯盆地西部黄土塬覆盖区的中生界侏罗系油藏成藏主控因素复杂,在未开展三维地震勘探的区域,仅利用二维地震资料进行钻探的成功率较低。为了提高钻井成功率,针对该区侏罗系河道砂油藏特点,采用时频电磁双侧、双源激发、多线接收的油气检测技术方案。在鄂尔多斯盆地西部ZB地区进行攻关试验,总结了适用于黄土塬覆盖区的时频电磁采集、处理、解释技术方案,即两项针对性采集方案设计和三项针对性处理、解释技术。利用GeoEast软件系统,基于深度学习开展时频电磁多参数智能油气预测。根据时频电磁解释成果,在时频电磁强异常区域部署并完钻Z6井,获得工业油气流,表明时频电磁预测结果与实钻结果吻合,证实了在黄土塬覆盖区利用时频电磁技术对侏罗系薄储层进行油气预测的可靠性。

黄土高原北部典型县域耕地土壤碳氮时空变异特征及影响因素

黄土高原生态环境脆弱,耕地质量的变化直接影响土地生产力的高低。选取其北部典型县域——天镇县,研究长时期耕地土壤有机质和全氮的时空演变规律及其影响因素,为黄土高原耕地质量提升和农业生态环境保护提供理论依据。基于1983年、2008年和2019年耕地质量数据,运用地统计学等方法分析天镇县有机质和全氮的时空演变特征。结果发现:(1)36年(1983—2019年)来,天镇县土壤有机质和全氮含量呈现整体上升、后期快速增加的变化特征。有机质和全氮含量的年均增加量前期(1983—2008年)较低,分别为0.20 g·kg^(–1)和0.01 g·kg^(–1),在后期(2008—2019年)较高,分别为0.29 g·kg^(–1)和0.03 g·kg^(–1)。碳氮比呈现前期无显著变化,后期显著降低。(2)36年来土壤有机质和全氮的块基比均提升至高于25%,表明地形等自然因素影响逐渐减弱,施肥等人为因素影响增强。(3)土壤有机质和全氮的空间分布特征相似,呈现西部低、东部高的格局,西北部和中部的变化速度快。综上,36年(1983—2019年)来,施肥及秸秆还田等因素是导致天镇县有机质和全氮含量变化的主要因素,因此,结合当地条件增施有机肥、推广秸秆还田并合理施用氮肥能快速提升耕地土壤肥力。

不同低氧胁迫方式下SD大鼠急进高原模型的比较研究

目的对SD大鼠在高原实地和模拟高原环境这2种低氧胁迫方式下建立的急进高原模型进行比较研究,进而鉴定模拟高原实验舱的可靠性。方法将SD大鼠分别急进模拟高原动物实验舱(4000 m)或高原实地实验室(4010 m)来建立大鼠急进高原模型,在暴露24 h或72 h后采集并测定高原生理病理变化相关指标,主要包括血常规、血生化、血气、氧化损伤指标(超氧化物歧化酶(superoxide dismutase,SOD)、丙二醛(malondialdehyde,MDA)、谷胱甘肽过氧化物酶(glutathione peroxidase,GSH-Px))、炎症指标(白细胞介素-1β(interleukin 1β,IL-1β)、γ干扰素(interferon-γ,IFN-γ)、单核细胞趋化蛋白1(monocyte chemotactic protein 1,MCP-1)和白细胞介素-6(interleukin 6,IL-6))、病理组织分析和低氧敏感基因(低氧诱导因子-1α(hypoxia inducible factor-1α,Hif-1α)和血管内皮生长因子A(vascular endothelial growth factor A,Vegfa))等,最终对结果进行差异性分析,得出差异性评估报告。结果相同海拔高度下,高原实地或模拟高原暴露72 h后均可以产生明显的肺部和脑部损伤。相同暴露时间下,动物机体的血常规、血生化和血气结果相近,炎症指标(IL-6,IL-1β,MCP-1和IFN-γ)、氧化损伤指标(MDA,SOD和GSH)和脑部低氧敏感基因(Hif-1α和Vegfa)等检测结果无显著性差异。但是,模拟72 h组的二氧化碳分压(partial pressure of carbon dioxide,PaCO_(2))和碱剩余(base excess,BE)显著高于其他低氧处理组、模拟72 h组的肺部低氧敏感基因(Hif-1α和Vegfa)与空白对照组无显著性差异,以及高原实地处理组脑系数显著高于模拟高原处理组等结果提示高原实地和模拟高原环境可能存在细微区别。结论模拟高原实验舱在4000 m海拔可成功建立急进高原动物模型,最优暴露时间应大于24 h但略短于72 h。模拟高原实验舱具有良好的可靠性,但条件允许情况下应尽量前往高原实地来建立急进高原动物模型。

城市道路隧道晚高峰环境参数时空差异性分析

隧道内晚高峰的出现会导致交通流量的时空分布发生很大的变化,并进一步影响隧道内的环境参数及CO浓度。为了改善隧道内环境质量,研究人员于晚高峰时段对玉涵路隧道内空气温度、风速、CO浓度、CO_(2)浓度和颗粒物浓度进行了详细的现场实测。测试结果表明:节假日的交通晚高峰时长更短以及高峰车流量更低,从而引起节假日的风速、温升、CO_(2)增量较工作日平稳且状况更优;工作日洞内风速减小1.7~3.2 m/s,纵向温升为6.1~7.7℃;随着车辆行驶速度延迟时间的增大,风速、温升、CO_(2)增量延迟时间呈增大趋势,最大延迟时间可达70 min;工作日隧道通风应考虑交通高峰开始后20 min至交通高峰结束后70 min时间段的延迟时间。

产生青海“22·8”极端强降水的三维环流结构分析

利用探空资料、台站逐时观测资料和ERA5逐时再分析资料,以包含对流层高层气温特征的三维环流结构为切入点,系统分析了2022年8月17—18日引发青海省西宁市大通县山洪灾害的短时极端强降水的精细化特征。结果表明,强降水发生前,中国西北地区上空300 hPa存在明显暖异常,随着时间推移暖异常略向东南方向移动且强度逐渐增强,并在降水峰值时刻达到最强。在静力平衡的调控作用下,对流层高层暖异常上层出现位势高度正异常,下层出现位势高度负异常。与这种配置相对应,对流层高层出现反气旋式环流异常,为高层辐散创造了有利条件。随着暖异常移动增强,高空西风急流异常向东南移动增强。另外,对流层中、低层出现气旋式切变,低层偏东气流转变为气旋前部偏南气流,为降水地区低层暖湿条件增强、大气不稳定度增大创造了有利条件。这种三维环流结构不仅为强降水形成提供了有利的高、低层环流条件与水汽条件,还为不稳定能量的积蓄奠定了基础。同时,在大通县西北高、东南低的喇叭口地形影响下,低层偏南气流携带的丰富水汽在此处聚集,配合较强的不稳定能量,共同促成了此次短时极端强降水过程。

川西北高原全株玉米与不同豆科牧草混贮品质研究

为发挥全株玉米与豆科牧草在家畜生产中的互补效应,提高川西北高原饲草利用率。本研究以全株玉米、全株大豆和全株箭筈豌豆为试验材料,设置三种饲草单独青贮及70%全株玉米和30%全株大豆混贮、70%全株玉米和30%全株箭筈豌豆混贮5个处理,采用聚乙烯袋密封保存30,60,90,120 d后开袋分析。结果表明:全株玉米与豆科牧草混贮可以显著提高全株玉米的粗蛋白含量和豆科牧草的可溶性碳水化合物及乳酸含量,显著降低豆科牧草的pH值、氨态氮及丁酸含量(P<0.05)。混贮处理中,全株玉米与全株箭筈豌豆混贮组的可溶性碳水化合物及乳酸含量增幅更大,pH值、丙酸、丁酸含量均值最低,分别为4.03,2.6和0.38 g·kg^(-1)DM。因此,全株玉米与全株大豆、全株箭筈豌豆混贮,可以均衡三种饲草的营养品质,获得更优质的青贮饲料,但在川西北高原地区以全株玉米和全株箭筈豌豆混贮效果更佳。