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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。
The soil fertility in the Three Gorges Reservoir area is obviously different. The main soil types of purple soil, paddy soil, and yellow soil, fertility levels vary greatly, the total amount of available content in different soil types are inconsistent. Along the river from top to bottom, the content of total N, total P and available P is relatively stable, and the content of total K, available K, and alkaline solution N changes greatly. The results of soil fertility comparison showed that the content of total N and total P were yellow soil> paddy soil> purple soil. The total K, alkali hydrolysis N, effective P, available K were purple soil> yellow soil> paddy soil. Correlation analysis of soil fertility in different districts and counties showed that total N and total P had significant correlations, and there was no correlation between alkali N, effective P and available K. Correlation analysis of major soil types showed that there was a significant correlation between total N and alkaline N in paddy soil and yellow soil. Soil fertility indicators in different districts and different soil types are quite different, so the level of fertilizer should be treated differently.