不同农田土壤养分可持续性指数的研究

Study on Sustainability Indices of Soil Nutrients Under Different Agroecosystems.

讨论了不同农田土壤碳、氮、磷、钾养分的可持续性指数。结果表明，不同施肥方式、不同土壤类型对碳、氮养分可持续性指数的影响表现为有机肥配施化肥处理＞有机肥处理＞化肥处理，潮土＞水稻土＞红壤；对磷、钾养分表现为化肥处理＞有机肥配施化肥处理＞有机肥处理，水稻土＞潮土＞红壤。相关分析表明，土壤养分可持续性指数与土壤养分相关或极相关。这表明，土壤养分可持续性指数可以用来评价土壤肥力和指示土壤养分的动态变化。

The sustainability indices of C, N, P, K under different agroecosystems were discussed. The results showed that different fertilizer application methods and different soil types had different impacts on the sustainability indices of soil nutrients. Their impacts on sustainability indices of soil C and N showed the following order: organic integrated chemical fertilizer treatment > organic fertilizer treatment > chemical fertilizer treatement, and meadow soil > paddy soil > red soil. Their impacts on sustainability indices of soil P and K showed the following order: chemical fertilizer treatment > organic integrated chemical fertilizer treatment > organic ferilizer treatment, and paddy soil > meadow soil > red soil. The results of correlation analyses indicated that the sustainability indices of soil nutrients were related or extremely related to soil nutrients, which proves that the sustainability indices of soil nutrients could be used for evaluation of soil fertility and for indicating the dynamic changes of soil nutrients.