大理永乐小流域坡改梯前后剖面土壤肥力分析

Analysis of Slope Section Soil Fertility before and after Slope- Terrace Transformation in Small Watershed in Yongle of Dali City

坡耕地水土流失严重,选取大理市洱源县永乐小流域研究了坡改梯工程前后土壤养分及土壤肥力变化状况,并对不同土层土壤肥力的变化进行比较分析。结果表明,在0~90 cm的土层内,土壤有机质和土壤全氮、全磷养分及土壤肥力的垂直变化特征明显,均表现为上层〉中层〉下层。随着坡改梯工程的实施,坡改梯初期、后期土壤养分及土壤肥力质量整体均呈上升趋势,其中全氮含量在坡改梯前后增加的变化规律相当明显。通过对比坡改梯前后土壤综合肥力指数增加变化幅度分析,表明坡改梯初期、后期两次改造土壤肥力增加变化幅度分别达12.8%、18.7%。坡改梯的实施对土壤养分的改善有明显作用,土壤肥力质量有一定提高。

Soil and water loss on slope farmland was severe,this study researched the changing condition of soil nutrients and soil fertility after slope changed into the terrace, and compared soil fertility variation on different soil layer in Yongle basin in Eryuan County of Dali. The results showed that,it had obvious vertical variation characteristics of soil organic matter,soil fertility,soil total nitrogen and total phosphorus in the 0 ~ 90 cm soil layer,it were upper middle lower. Soil nutrients and soil fertility quality were on the upward trend with the implementation of slope land terracing, the total nitrogen content increased quite obvious. By comparing the soil integrated fertility index of cultivated sloping land before and after terracing, the results indicated that the early and late terracing stage is increased respectively 12. 8%, 18. 7%. when slope land is rebuilded to terrace, there is a significant effect in the soil nutrient, also the soil fertility quality is improved.