三峡库区耕地土壤肥力特征及对策研究

三峡库区土壤肥力差异明显。主要土壤类型紫色土、水稻土、和黄壤,肥力水平差异较大,全量、有效态含量在不同土壤类型不一致。沿江从上而下,全N、全P、有效P含量较稳定,全K、有效K、碱解N含量变化较大。不同土壤类型肥力比较结果表明全N、全P含量为黄壤>水稻土>紫色土;全K、碱解N、有效P、有效K含量为紫色土>黄壤>水稻土。不同区县土壤肥力相关性分析表明全N、全P具有显著相关性,碱解N、有效P、有效K相互之间无相关性。主要土壤类型相关性分析表明水稻土、黄壤中全N同碱解N具有显著相关性。在不同区县和不同土壤类型土壤肥力指标有较大差异,因此在施肥水平上应区别对待。

Soil Fertility in the Three Gorges Reservoir Area

The difference of soil fertility is obvious in the three gorges reservoirarea. The difference of fertility level of the main purple soil , rice soil and yellow soil is bigg. The comparative results of fertility of different soil types show that the contents of N and P in the yellow soil is higher than those in rice soil and purple soil; the contents of K,alkaline N,available P,available K in purple soil is higher than in yellow soil and rice soil. The analysis of correlation of the main soil types make it clear that the contents of N and alkalization N are related in rice soil and yellow soil. The quality analysis result of fertility of soils make it clear that fertility of soils are different in different counties and soil types in the three gorges reservoirarea.