用土壤生物和养分指标表征土壤肥力的可持续性

运用土壤生物和养分指标讨论了不同农田土壤肥力可持续性指数。结果表明， 不同施肥处理对土壤肥力可持续性指数有很大影响。有机肥明显提高土壤碳、氮和生物管理指数。单施化肥促进土壤磷、钾管理指数的上升。厩肥比绿肥更有利于提高土壤肥力可持续性指数。与参比土壤相比， 化肥处理的土壤肥力可持续性指数平均每年都增长， 红壤为５ ． ６３ ， 水稻土为５ ． ８ ， 潮土为４ ． ８３ ； 而对照处理的土壤肥力可持续性指数平均每年都下降， 红壤为５ ． ６ ， 水稻土为６ ． ５８ ， 潮土为４ ． ５６ 。不同施肥方式对土壤肥力可持续性指数的影响顺序为有机肥、有机肥配施化肥＞ 化肥＞ 参比土壤＞ 对照。

Soil Biological and Biochemical Properties Are highly Sensitive to Environmental Stress and thus Can Be Used to Assess the Sustainability of Soil Fertility.

The sustainable fertility index (SFI) in different agroecosystems was discussed by integrating soil nutrients and biological indices. Results indicated that fertilization had great influences on SFI. Organic manure enhanced soil C, N and biological management indices, while chemical fertilizer increased soil P, K management indices. Farmyard manure was better than green manure in raising management index of soil carbon, nitrogen and biology. Compared with the reference, chemical fertilizer enhanced SFI annually 5.63 in red soil, 5.8 in paddy soil and 4.83 in meadow soil, while SFI under the check decreased annually 5.6 in red soil, 6.58 in paddy soil and 4.56 in meadw soil respectively. The order of SFI influenced by different treatments was manure, manure combination chemical fertilizer>chemical fertilizer>reference>check.