华北农牧交错带农田-草地景观土壤速效氮界面研究  

Study on Soil Available Nitrogen Boundaries of Farmland-grassland Mosaic in Agro-pastoral Transition of North China

作　　者：傅尧[1,2] 刘利[2] 林长存[1] 

机构地区：[1]北京林业大学林学院,北京100083 [2]中国环境科学研究院,北京100012

出　　处：《草地学报》2014年第6期1222-1226,共5页Acta Agrestia Sinica

基　　金：中央高校基本科研业务费专项资金(BLX2012037)资助

摘　　要：利用非线性回归的生态界面测试分析法(BEDA),对华北农牧交错带农田-草地景观土壤的速效氮界面在生长季(5-9月)的时空动态进行分析,为干旱、半干旱地区以植被恢复为主的大规模生态环境建设提供参考。结果表明:农田-草地边界的土壤速效氮生态界面位于草地内。在少雨的5月,农田-草地的边界影响域最小,仅为37.5m;而在雨水较为丰沛的8月,边界影响域最大,为57.5m。相对于少雨期,丰雨期的速效氮生态界面会更靠近草地内部。速效氮素在农田-草地界面上表现出地表生态流季节动态性。In order to provide reference to the vegetation restoration of large scale ecological construction in the arid and semi-arid area,the spatial and temporal variability of soil available nitrogen border at the grassland-farmland ecotone were analyzed by the method of a border-and-ecotone detection analysis （BEDA） based on non-linear regression analysis.The study was located in a mosaic of anthropogenic deciduous grasslands and farmland in the agro-pastoral transition of North China from the dry period （May） to rainy period （September） of 2012.The results showed that the minimum DEI towards the grassland interior was 37.5 m in the dry period （May）.The maximum DEI of 57.5 m occurred in the rainy period （August）.The amount of precipitation affected the simple diffusion process of available nitrogen,which represented the seasonal dynamics of ecological flows between grassland and farmland.

关 键 词：农牧交错带 农田-草地界面 界面影响域 速效氮 

分 类 号：S812-05[农业科学—草业科学]