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1、SoIL AND WATER CONSERVATION IN CHINA No12(381)2013 Abstracts E船ects 0f Grazing Disturbance to the Soil and Vegetation of Desert Grassland ，XIAO Xu。pei SONG Naiping ，WANG Xing 。et a1 (1School of Resourees and EnvironmentNingxia University，Yinchuan，Ningxia 750021，China； 2Key Laboratory of the Ministry
2、 of Education of Restoration and Rehabilitation for the Degraded Ecosystem in Northwest China，Yinchuan，Ningxia 750021，China)(19) Grazing is one of the main interference factors on grassland ecosystem，affecting the ecological process of grassland ecosystem vegetation and soilTaking desert grassland a
3、rea in Yanchi County of Ningxia as a research object，the paper arranged 6 grazing disturbance gradients of CKTl，T2，13，T4 and T5 respectively according to the surface vegetation and surface accumulation of sheep manure and analyzed the response of vegetation and soil to the different grazing disturba
4、nce by using variance and regression analysisThe onteomes show that a)the biomass1itter on the groundvegetation coverage show the trend of first increase and then decrease along with the increase of grazing dis turbancesupporting the moderate interference theory；b)soil moisture increases-ith the inc
5、rease of grazing disturbance while the soil bulk density is no significant change and；e)the changes of soil organic carbon and total nitrogen are roughly the same along with the change tend- ency of grazing disturbance and both of them have a strong linear relationship，the change trend of CN and the
6、 variation law of organic car- ban is slightly differentCN and the ground biomass have remarkable linear relationship with the quantitv of sheep manure on the surface It shows that the quantity of sheep manure has a strong influenee to the soil carbon and nitrogen distribution and grassland producti
7、vity and re flects the complexity of the changes of organic carbon and total nitrogen content and interaction effect between each factor Key words：grazing disturbance；soil；vegetation；spatial variation；desert grassland Sensitivity Evaluation of SoiI Erosion of Dahuanjiang WatershedSUN Shuying，SONG Sh
8、uqiao，SU Yong (School of Resources and Environmental ScienceGuangxi Teachers Education University，Nanning，Guangxi 530001，China)(46) The paper made a comprehensive evaluation on the sensitivity of soil erosion of Dahuanjiang watershed by using GIS technology based on the Universal Soil Loss Equation(
9、USLE)，according to the natural geographic characteristics of the watershed and through selecting four fac tors of rainfall erosivity(月)，soil erodibility(K)，terrain factor( )and land cover(C)as the indicators of soil erosion sensitivity evalua- tion of the watershedThe outcomes show that the soil ero
10、sion of the watershed mainly belongs to the moderate level and the level belowac counting for 7361，ofwhichthe extremely sensitive area making up 1O05distributed in the southern border area and the slight sensi rive area making uD 1423mainly distributed in the northwest area of the watershedThe paper
11、 also analyzed the reasons of affecting the spatial distribution of soil erosion sensitivity of the watershed Key Words：soil erosion：sensitivity evaluation；GIS technology；Dahuanjiang watershed The Relationship of Rain伽l Inmtration Response and Water Content Monitoring of Landslide YANG Qiang DING We
12、icui 。LI Gang 。et a1 (1Center for Hydrogeology and Environmental Geology，CGS，Baoding，Hebei 071051，China； 2Institute of Geology，Chinese Academy of Geological Sciences，Beijing 1O0037，China)(52) It established rea1time monitoring system of water content by taking Sidaoqiao landslide in the Three Gorges
13、 Reservoir area as an object of studyIt studied the different drills，monitoring response of water content at different layers and time relationship between saturation process and sustainable saturation through monitoring the water content of the landslide during typical rainfall process and on the w
14、hole to find out the dynamic change process of water content in the landslide during the process of rainfall infiltrationIt could generally analyze the whole processes of rainfall infiltration rechargerunoff and drainage of the landslide according to rea1time monitoring data and combining with stra
15、turn data and drainage facilitiesIn additionthe analysis results of rainfall infihration and the effective data collected by realtime monitoring system had provided reliable basis for establishing related numerical models and simulating the influence of rainfall infiltration to the stability of the
16、landslide Key Words：Sidaoqiao landslide；rain；real-time monitoring；water content；the Three Gorges Reservoir area Group Roots E ct 0f Herbs and Its Contribution to Slope Protection in the Loess Area of Xining Basin LU Hai-jing YU Qinqin ，HU Xiasong et a1 (1Department of Geological Engineering，Qinghai University，Xining，Qinghai 810
