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为研究175 m蓄水前三峡库区消落区土壤养分分布特征,选择12个采样区,采用野外调查和室内分析相结合的方法,研究结果表明土壤呈中性偏碱性p,H值为6.93～7.91;全磷、全钾、有效钾和铵态氮的含量分布比较集中,差异较小;有效磷、有机质、全氮和硝态氮比较分散,差异较大;土壤类型和土壤粒级对土壤养分含量会产生重要影响。主成分分析和聚类分析将研究区大致分为4类:土壤综合养分较高型、土壤贫瘠型、有效磷含量较高型和全磷、全钾含量较高型,并针对不同类型的土壤分别提出改善措施。本研究为三峡库区消落区的生态环境保护和土地资源的合理规划提供一定的指导意义。
In order to study the characteristics of soil nutrient distribution in the fluctuation area of the Three Gorges Reservoir before the 175 m impoundment, 12 sampling areas were selected. The field survey and indoor analysis were used to analyze the results. The results showed that the soil was neutral and alkaline with p and H values of 6.93 ~ 7.91. The contents of total phosphorus, total potassium, available potassium and ammonium nitrogen were more concentrated and the differences were smaller. The contents of available phosphorus, organic matter, total nitrogen and nitrate nitrogen were relatively dispersed and varied greatly. The soil types and soil fractions Soil nutrient content will have a significant impact. The principal component analysis and cluster analysis divided the study area into four categories: higher soil general nutrient, poor soil type, higher available phosphorus and total phosphorus, higher total potassium, and different types of soils Respectively proposed improvements. This study will provide some guidance for the eco-environmental protection and rational planning of land resources in the watershed of the Three Gorges Reservoir.