高寒草甸“黑土滩”对土壤养分的影响

The Influence of "Black Beach" to Soils Nutrient on Alpine Meadow

对玛多县花石峡镇原生植被土壤和"黑土滩"土壤养分的研究结果表明:玛多县花石峡镇高寒草甸"黑土滩"土壤与原生植被土壤相比,总的养分含量均下降了,并且随着土层的加深,所有供试土壤的有机碳、全氮和全磷含量都呈下降趋势;土壤的有机碳和全氮在各土层间都表现出显著的差异(P<0.05);并且土壤的有机碳密度随退化程度的加剧和土层的加深而显著下降;原生植被(未退化地)土壤的pH均小于"黑土滩"土壤,并随着土壤深度的加深而升高;总的来看,8月土壤养分含量总体上均高于6月的土壤,并且都主要集中在表层土壤中。

The undegradation and ＂black beach＂ soils nutrient on Huashixia town of Maduo county was studied. It revealed that ＂black beach＂ soils nutrient decreased comparing with undegradation soils of alpine meadow, and the contents of all soils organic carbon, total nitrogen and total phosphorus decreased. Soil organic carbon and total nitrogen contents at a scale of 0 - 40 cm is significant （P〈 0.05）. Soil organic carbon density decreased with the increase of degraded level and soil depth. The pH （H2O） of undegradation soils is less than ＂black beach＂ soils, and it increased with increase of soil depth. In all, the soil nutrient contents in August are higher than that in June, and the nutrients are all mainly concentrated in surface soil.