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 agropastoral transitional zone,reveals that the quickacting 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 quickacting P and K enhanced.Mixed sowing of Siberian wildrye and smooth bromegrass(3∶1) could raise the soil content of quickacting phosphorus,while smooth bromegrass and wheatgrass sowed in a ratio of 3∶1 could raise the soil content of quickacting potassium effectively.
出处
《草地学报》
CAS
CSCD
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
关键词
草原学
农牧交错带
退耕还草
磷含量
钾含量
Grassland science
agro-pastoral transitional zone
transforming cropland into grassland
phosphorus content
potassium content
