川中丘陵区农田养分变化与可持续发展研究

采用典型抽样法,以梓潼、资中和犍为为例,根据实地调查、有关统计资料和土壤分析结果,研究了川中丘陵区1985～1999年农田养分平衡和主要土壤养分变化。结果表明:1990年后,农田氮素开始出现盈余,平均盈余率超过35%;磷素平均盈余率超过40%;钾素一直呈大比例的亏缺状态,平均亏缺近50%。通过2000年和第2次土壤普查结果的对比分析研究,阐述了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状况提出了实现川中丘陵区农田可持续利用的对策和措施。

Study on Farmland Nutrients Change and Sustainable Development in Central Hilly Area of Sichuan

According to statistical material and analytic data of soil related, the farmland nutrients balance and the dynamic changing tendency of the main soil nutrients from 1985 to 1999 in hilly areas in the middle basin of Sichuan were discussed through Zitong, Zizhong and Qianwei counties. The results showed that after 1990, the nitrogen in farmland was changing from equilibrium to surplus, it was surplus over 35 percent; the phosphorus was surplus over 40 percent; the potassium was deficient all along with high proportion, it was deficient nearly 50 percent. Meanwhile, comparing the content of soil nutrients between 2000 and the second soil investigation, the effect of farmland nutrients balance on soil nutrients level was discussed also, thus the regulating ways relevant was given for sustainable farmland development.