黔中喀斯特石漠化地区不同土地利用类型土壤养分含量研究

目的]探讨不同土地利用方式对土壤养分含量与分布的影响。方法]从贵州普定县典型喀斯特山区耕地、林地和荒地采集96份土壤样品,并对3种土地利用类型的土壤养分进行室内理化分析。结果]3种土地利用类型的土壤pH值依次为:荒地>林地>耕地;土壤有机质含量依次为:林地>荒地>耕地。3种土地利用类型的土壤全氮含量均较丰富,碱解氮含量偏低,尤其是耕地;全磷含量水平很低,全磷含量低于1.0 g/kg的土壤分别占耕地、林地和荒地的95.23%、95.83%和100%;耕地有效磷含量较高,而林地和荒地有效磷含量较低;荒地全钾和速效钾含量较高,林地和耕地均存在不同程度地缺钾。结论]该研究为喀斯特石漠化地区生态系统的恢复重建和农业生产提供参考。

Soil Nutrient Content of Different Land-use Types in Karst Rocky Desertification Area in Central Guizhou Province

Objective] The study aimed to discuss the effect of different land-use types on the soil nutrient content and distribution.Method] Ninety-six samples of soil were selected from cultivated land,forest land and waste land in the classic Karst mountain area in Puding County of Guizhou Province and the physical and chemical analysis on the soil nutrients from 3 kinds of land-use types were made in lab.Result] The pH in soils from 3 kinds of land-use types in order was the waste land>forest land>cultivated land;the organic matter content in soil in order was forest land>waste land>cultivated land.In the in soil from 3 kinds of land-use type,the total N content was rich;the available N was lower,especially in cultivated land;the total P content was very low and the soils in which the total P content was lower than 1.0 g/kg were 95.23%,95.83% and 100% of the cultivated land,forest land and waste land resp.;the effective P content in the cultivated land was higher,but that in forest land and waste land were lower;the total K and available K content in waste land were higher and the cultivated land and forest land lacked K to different extent.Conclusion] This study provided the reference for recovering and reconstructing the ecosystem and agricultural production in Karst rocky desertification area