摘要
农田养分平衡状况不仅直接影响土壤肥力的发展方向,而且关系到农业的可持续发展。根据投入产出核算的基本原理分析1949-2005年江西省农田养分平衡状况,得出如下结论：①氮素在1965-1977年开始有10%左右低水平盈余,1978年以后江西农田氮素投入一直维持在20%以上的高盈余率,到20世纪80年代中期以后（1986-2005年）年平均氮素盈余率高达46.6%,每年平均盈余约3.85×10^5t氮（为未扣除化肥氮素损失的理论值）;②20世纪80年代中期以后,磷素的平衡盈亏率比前期大大增加,年平均盈余率高达43.4%,即每年平均盈余约1.74×10^5t磷;③长期以来江西农田钾素亏缺状况比较严重,在20世纪80年代中期以前,钾素的平衡亏缺率高达50%以上,此后钾素化肥用量逐年增加,直到21世纪初才基本实现了盈亏平衡。
The status of nutrient balance not only influences the soil fertility but also concerns the sustainable development of cropland ecosystem. Through analyzing the nutrient balance of nitrogen, phosphorus and potassium in cropland during 1949 to 2005 in Jiangxi Province, the following results were achieved：（1）the average surplus rate of nitrogen was only 10% during the year of 1965 to 1977 and increased gradually to 20% since 1978, and during 1986 to 2005 the surplus rate of nitrogen was more than 46. 6% ,namely there was 3.85 ×10^5 t N in surplus ;（2）the average surplus rate of phosphorus was more than 43.4% since the middle of 1980s ,namely there was 1.74 ×10^5 t P2O5 in surplus;（3）the average deficit of potassium was more than 50% before the middle of 1980s,and the potassium was balanced in cropland till the beginning of 21st century.
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2008年第5期919-926,共8页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家科技支撑计划项目(2006BAC08B05)
科技部国际合作重大项目"鄱阳湖流域生态系统综合治理研究"(2006DFB91920)
关键词
农田
养分平衡
江西省
cropland
nutrients balance
Jiangxi Province
