The effects of land use and its patterns on soil properties in a small catchment of the Loess Plateau
Due to relatively strong human activities in the hilly area of Loess Plateau, the natural vegetation has been destroyed, and landscapepattern based on agricultural land matrix was land use mosaic composing of shrub land, grassland, woodland and orchard.This pattern has animportant effect on soil moisture and soil nutrients.The Danangou catchment, a typical small catchment, was selected to study the effects ofland use and its patterns on soil moisture and nutrients in this paper.The results are as follows: The comparisons of soil moisture among sevenland uses for wet year and dry year were performed: (1) the average of soil moisture content for whole catchment was 12.11% in wet year,while it was 9.37% in dry year; (2) soil moisture among seven land uses was significantly different in dry year, but not in wet year; (3) fromwet year to dry year, the profile type of soil moisture changed from decreasing type to fluctuation-type and from fluctuant type to increasingtype; (4) the increasing trend in soil moisture from the top to foot of hillslope occurred in simple land use along slope, while complicateddistribution of soil moisture was observed in multiple land uses along slope.The relationships between soil nutrients and land uses and landscapepositions were analysed: ( 1 ) five nutrient contents of soil organic matter (SOM), total N (TN), available N (AN), total P (TP) andavailable P (AP) in hilly area were lower than that in other areas.SOM content was less than 1%, TN content less than 0.07%, and TPcontent between 0.05% and 0.06%; (2) SOM and TN contents in woodland, shrub land and grassland were significantly higher than that infallow land and cropland, and higher level in soil fertility was found in crop-fruit intercropping land among croplands; (3) soil nutrientdistribution and responses to landscape positions were variable depending on slope and the location of land use types.
作 者： WANG Jun FU Bo-jie QIU Yang CHEN Li-ding 作者单位： WANG Jun(Department of Systems Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;Land Consolidation and Rehabilitation Center, Ministry of Land and Resources, Beijing 100035, China)FU Bo-jie,CHEN Li-ding(Department of Systems Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)
QIU Yang(Beijing Normal University, Department of Resources and Environmental Sciences, Beijing 100875, China)
刊 名： 环境科学学报(英文版) ISTIC SCI 英文刊名： JOURNAL OF ENVIRONMENTAL SCIENCES 年，卷(期)： 2003 15(2) 分类号： Q149 P968 关键词： hilly area of Loess Plateau land use pattern soil moisture soil nutrient