四川盆地丘陵区农田养分平衡研究

Study on the Farmland Nutrients Balance in the Hill Zone of Sichuan Basin

研究了四川盆地丘陵区3个生态亚区近20年(1981～1999)农田养分平衡与土壤养分动态变化趋势。结果表明:各生态亚区农田氮素平均盈余59 59%、39 75%、11 12%;磷素平均盈余40%以上;钾素平均亏缺38%以上。根据3个典型县土壤养分动态变化,阐述了农田养分平衡状况对土壤养分的影响。

The farmland nutrients balance and the dynamic changing tendency of soil nutrients were discussed during nearly 20 years (from 1981 to 1999) in three subecosystems zone of the hill of Sichuan basin. The results show that the nitrogen in farmland is surplus by 5959%, 3975% and 1112%, the phosphorus are surplus over 40%, the potassiums are deficient over 38% on the average. According to the dynamic changing tendency of soil nutrients in three counties, the effects of farmland nutrients balance on soil nutrients are discussed.