三峡库区典型坡改梯地土壤肥力质量评价——以重庆市巫山县为例

Study on Soil Fertility Evaluation of the Typical Terracing in Three Gorges Reservoir Area:a Case Study in Wushan County of Chongqing City

以三峡库区重庆市巫山县典型坡改梯地为例,经过土样采集、实验分析、数据处理等方法,从土地利用方式、坡改梯年限两方面对研究区土壤养分特征及肥力质量进行了分析,结论如下:研究区的土壤有机质及养分含量整体处于中下级水平;有机质和养分全量在土壤中比较稳定,速效养分的变异程度较大。除了全钾以外,其余各项评价指标均与有机质呈显著的正相关关系(p<0.05);不同土地利用方式的肥力质量综合评价从高到低依次排列为:荒地、菜地、林地、粮田、果园;随着坡改梯时间的增加,土壤肥力质量整体上呈上升趋势,但不呈现明显的规律性。研究认为当地土壤肥力的数量化综合评价研究起步较晚,还需要进一步改进和完善。

The research take Wushan County of Chongqing City as an example, the distribution of fertility indicators are analyzed. Then there is a further discussion on soil nutrients which are influenced by the different land use patterns and different terrace age. By the method of soil sampling and laboratory analysis, the results are as follows： the whole level of the soil nutrient is lower-mid-dle. The total nutrient is stable relatively while the available nutrient is affected by the fertilization and tillage easily; the correlation of soil organic matter content reached to very significant level compared with the soil nutrient except the total potassium. The evalu-ation of soil fertility quality by fuzzy comprehensive assessment method in different use land shows that, ranked as follows： waste- land）vegetable garden〉forest land〉grain crop fields〉orehard fertility after the slope farmland transformed into terraced fields, There is a significant improvement in soil nutrients content and but the variation is not obvious.