摘要
把坡耕地耕层熟土和心土层生土进行五种重量组合,来模拟坡耕地不同土壤侵蚀状况;在五种组合的土壤上,采用盆栽试验来评估遭受不同侵蚀程度下的坡耕地生产力,以及通过施肥来恢复土壤生产力的效果。结果表明:耕层熟土所占比例越少,土壤中的有机质、铵态氮、硝态氮、速效磷、速效钾的含量和土壤pH越低,且土壤有机质、铵态氮、硝态氮、速效磷、速效钾的含量与熟土土壤比例呈极显著正相关;随着耕层熟土用量减少,玉米长势逐渐变差,籽粒产量和秸秆产量逐渐降低;坡耕地遭受严重土壤侵蚀后,生产力下降非常明显,即使采用平衡施肥和增施腐熟农家肥,短期内很难恢复到原有水平。
Five soil combinations prepared by mixing different proportions of the fertile top soil with the subsoil from sloping farmlands were used to simulate the different scenarios representing different severity of soil erosion in a pot experiment.This study aimed to assess the productivity of soils suffering from different soil erosion and to seek solutions to restore soil fertility via different fertilization practices.Results showed that the contents of soil organic matter,available ammonium nitrogen,nitrate nitrogen,available phosphorus,available potassium and pH were positively correlated with the proportions of the fertile top soil in the soil combination,and corn yield was affected in the same manner.It demonstrated that once the fertile top soil was severely eroded,crop yield significantly dropped and the soil erosion induced yield reduction could not be easily restored by fertilization in a short term.
出处
《土壤通报》
CAS
CSCD
北大核心
2012年第6期1480-1485,共6页
Chinese Journal of Soil Science
基金
国际植物营养研究所(IPNI)资助项目“云南持续农业的坡地管理”[NMS-Yunnan199801]
农业部公益性行业(农业)科研专项“绿肥作物生产与利用技术集成研究及示范”[201103005]资助
关键词
耕层熟土
心土层生土
土壤组合
坡耕地生产力
模拟试验
Fertile top soil
Subsoil
Soil combination
Productivity of sloping land
Simulated experiment
