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龙洞沟泥石流滩地剖面结构和土壤物理结构较差 ,砂石化现象严重 ;土壤微团聚体数量较少 ,粒级间比例不合理 ;土壤养分除全钾极丰富外 ,其它大部分养分都处于缺乏或极缺状态。通过开发利用 ,其表土层结构特性和养分状况得到显著改善 :砾石含量由 63 .0 3～ 70 .78%减少到 3 9.66～ 57.62 % ,粉粒和粘粒含量由 2 6.75～ 3 1.89%增加到 3 0 .54～41.93 % ;有机质由 7.1～ 10 .8gkg- 1提高到 15.8～ 2 6.9gkg- 1;全氮由 1.2 0～ 1.40gkg- 1提高到 1.50～ 1.93gkg- 1;全磷由0 .46～ 0 .57gkg- 1提高到 0 .48～ 0 .79gkg- 1;有效氮由 47.2 2～ 56.67mgkg- 1提高到 79.3 9～ 119.46mgkg- 1;有效磷由 2 .2 1～ 4.69mgkg- 1提高到 5.58mgkg- 1;有效钾由 2 9.84～ 40 .3 6mgkg- 1提高到 51.89～ 89.3 6mgkg- 1。不同利用模式的改良作用不同 ,依次为 :菜园地 >苹果 +蔬菜地 >苹果园地 >苹果 +花椒地 >花椒园地 >荒滩地
Longdonggou debris flow beach cross-sectional structure and the physical structure of the poor soil, gravel serious; soil microaggregates less, the proportion of particle size is unreasonable; addition to soil nutrients extremely rich in potassium, the other most of the nutrients are in short or Very short of state. Through the development and utilization, the topsoil structural characteristics and nutrient status have been significantly improved: the gravel content decreased from 63.0 to 70.68% to 39.66 to 57.62%, and the content of silt and clay increased from 2.75 to 3.89% To 30.54 ~ 41.93%; the organic matter content increased from 7.1 ~ 10 .8gkg-1 to 15.8 ~ 2 6.9gkg-1; the total nitrogen increased from 1.20 ~ 1.40gkg-1 to 1.50 ~ 1.93gkg-1; 0.46 ~ 0.57gkg-1 increased to 0.48 ~ 0.79gkg-1; available nitrogen increased from 47.22 ~ 56.67mgkg-1 to 79.39 ~ 119.46mgkg-1; available phosphorus increased from 2.21 ~ 4.69 mgkg-1 increased to 5.58mgkg-1; available potassium increased from 9.88 ~ 40.36mgkg-1 to 51.89 ~ 89.3 6mgkg-1. Different utilization modes have different improving effects, which are as follows: vegetable garden> apple + vegetable land> apple orchard> apple + pepper> pepper garden> wasteland