摘要
根据有关统计资料、实地调查和土壤分析数据,采用典型抽样法,以犍为县为例,研究了近14年(1985～1999年)来该县农田养分平衡与土壤养分变化的趋势。结果表明:20世纪90年代以后,农田氮素由持平转向盈余;磷素全面扭亏为盈,盈余率已超出50%;钾素一直处于大比例亏缺状态。通过1981年和2000年的土壤主要养分含量对比研究,获得了近20年来土壤养分动态变化的基本趋势,以及农田养分平衡状况对土壤养分变化的影响,并针对农田养分平衡与土壤养分变化的趋势,提出了四川紫色丘陵区县级农田养分平衡与土壤养分变化的相应调控对策和措施。
According to statistical material and analytic data of soil related, the farmland nutrients balance and the dynamic changing tendency of soil nutrients during nearly 15 years (from 1985 to 1999) in Qianwei county were discussed. The result showed that in 1990s, the nitrogen in farmland was changing from equilibrium to surplus; the content of phosphorus was varying throughout from deficiency to surplus, it is surplus over 50 percent at present time; the potassium was deficient all along with high proportion. Meanwhile, comparing the content of soil nutrients between 1981 and 2000, the dynamic changing tendency during nearly 20 years was analyzed, the effect of farmland nutrients balance on soil nutrients level was discussed also, and the regulating ways relevant was given.
出处
《水土保持学报》
CSCD
北大核心
2003年第1期103-106,共4页
Journal of Soil and Water Conservation
基金
四川省教育厅重点基金项目资助(SC9801402)
关键词
农田
养分平衡
收支结构
生态系统
farmland
soil nutrient balance
construction of input and output
ecosystem
