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采用时空互代法,运用模糊数学判别模式,以重庆市巫山县典型坡改梯地为研究对象,对三峡库区不同坡改梯年限土壤肥力质量进行研究并评价。结果表明:整体而言,该地区土壤肥力较差;从变异系数来看,在该研究区土壤养分的8项评价指标中,除硝态氮为强变异性外,其余7项指标均属于中等变异;根据加乘法则对各个肥力因子指标值采用乘法进行合成,各不同坡改梯年限土壤综合肥力指数(IFI)大小排序为:14 a>35 a>20 a>9 a>0 a(坡耕地)>2 a,坡改梯工程短时间内不利于土壤养分的集聚,但随着年限的增加,土壤肥力变化总体呈上升趋势。
The spatial and temporal substitution method was applied to study the soil fertility quality of different slopes in the Three Gorges Reservoir Area by using the fuzzy mathematics discriminant model and the typical slope-changing land in Wushan County, Chongqing Municipality as the research object. The results showed that: Overall, the soil fertility was poor in this area. From the coefficient of variation, among the eight indicators of soil nutrients in the study area, except for nitrate-N, which was strong variability, the remaining seven indicators were medium According to the rule of multiplication and multiplication, the index values of each fertility factor were synthesized by multiplication. The order of soil fertility index (IFI) in different years was: 14 a> 35 a> 20 a> 9 a> 0 a Arable land)> 2 a, slope to ladder project is not conducive to short-term accumulation of soil nutrients, but with the increase of years, soil fertility changes overall upward trend.