晋北赖草草地演替过程中土壤理化性质的变化

Effect of Leymus secalinus grassland succession inNorthern Shanxi Province on soil physical andchemical properties

摘要:

以晋北赖草草地盐碱化斑块演替过程中的土壤为研究对象,采用空间替代时间法研究不同斑块土壤的理化特征,探究斑块演替过程中土壤理化性质的响应,旨在为草地植被恢复与盐碱化草地治理提供理论依据。结果表明:随着光碱斑→碱蒿斑块→芦苇斑块→碱茅斑块→虎尾草斑块→赖草斑块的演替变化,土壤容重从2.20 g/cm³降低到1.61 g/cm³、pH从10.85降低到8.82、速效磷含量从2.25 mg/kg降低到1.49 mg/kg,土壤含水量从8.33%上升到18.46%、有机质含量从0.33%上升到1.11%、全氮含量从0.04 mg/kg上升到0.14%、全磷含量从0.02%上升到0.03%、全钾含量从2.31%上升到2.59%、速效氮含量从42.71 mg/kg上升到92.27 mg/kg、速效钾含量从61.36 mg/kg上升到81.78 mg/kg;各土壤理化性质发生相应变化。

Abstract:

Taking the soil in the process of salinization patches succession in Leymus secalinus grassland of Northern Shanxi Province as the research object,we used the method of space replacing time to study the physical and chemical characteristics of soil in different patches and explore its response to the succession process of salinization patches,which was used to provide theoretical basis for grassland vegetation restoration and salinized grassland management.The results showed that with the succession process of bare patch→Artemisia anethifolia patch→Phragmites australis patch→Puccinellia distans patch→Chloris virgata patch→ Leymus secalinus patch,soil bulk density decreased from 2.20 to 1.61g/cm³,pH decreased from 10.85 to 8.82,and available phosphorus decreased from 2.25 to 1.49 mg/kg;soil water content increased from 8.33% to 18.46%,organic matter from 0.33% to 1.11%,total nitrogen from 0.04% to 0.14%,total phosphorus from 0.02% to 0.03%,total potassium from 2.31% to 2.59%,available nitrogen from 42.71 to 92.27mg/kg,and available potassium from 61.36 to 81.78 mg/kg;the bulk density,organic matter,nitrogen and moisture had obvious correlation with other soil physical and chemical factors,and played a key role in improving the soil quality and promoting nutrient cycling.