农牧交错带退耕还草对耕作层土壤磷、钾含量的影响  

Soil Content of Phosphorus and Potassium in the Agro-Pastoral Transitional Zone After Cropland Being transformed into Grassland

作　　者：韩永伟[1] 韩建国[1] 王堃[1] 张蕴薇[1] 康俊梅[1] 

机构地区：[1]中国农业大学草地研究所,北京100094

出　　处：《草地学报》2003年第3期228-233,共6页Acta Agrestia Sinica

基　　金：国家重点基础研究发展规划G2000018606项目资助

摘　　要：在农牧交错带以小麦为对照,研究退耕还草对土壤磷、钾含量的影响。结果表明,退耕还草后,土壤0～20cm速效磷、钾含量均高于小麦地。冰草和无芒雀麦能较好地提高土壤速效磷和速效钾的含量。老芒麦与无芒雀麦混播(3∶1)可以明显提高土壤速效磷含量。无芒雀麦与冰草混播(3∶1)可以较好地提高土壤速效钾含量。A study,comparing the soil content of phosphorus and potassium in a plot of grassland that has been transformed from cropland with that of a plot of wheat field in the agropastoral transitional zone,reveals that the quickacting P and K in a soil depth of 0～20 cm of the former are higher than those of the latter of the same soil depth.Land cultivated with wheatgrass and smooth bromegrass could effectively have its soil content of quickacting P and K enhanced.Mixed sowing of Siberian wildrye and smooth bromegrass(3∶1) could raise the soil content of quickacting phosphorus,while smooth bromegrass and wheatgrass sowed in a ratio of 3∶1 could raise the soil content of quickacting potassium effectively.

关 键 词：草原学 农牧交错带 退耕还草 磷含量 钾含量 

分 类 号：S812.2[农业科学—草业科学]