锡林郭勒退化草原不同恢复年限土壤物理性质与渗水性能

摘要

对锡林郭勒草原白音锡勒牧场不同年限围封样地土壤物理性质及渗水能力进行了研究,结果表明:(1)不同恢复年限土壤物理性质存在明显差异,随着恢复年限的增长,土壤机械组成中砂粒和粘粒含量减少、粉粒含量增加；自然含水率、总孔隙度、团粒水稳性均随恢复年限增长而增长；容重则随着恢复年限增长而减小.(2)土壤入渗性能随着恢复年限的增长而增加,而且初渗速率、稳渗速率均与总孔隙度、团粒水稳度具有显著正相关性；初渗速率与自然含水率、容重具有极显著负相关性,与稳渗速率具有显著负相关性.随着植被的恢复,土壤的物理性状得到了良好的改善,土壤的渗透性能得到提高.%Soil infiltration capacity and other physical characteristics of soil samples collected in restoration plots in Baiyinxile ranch of Xilingol grassland characterized by different stages of ecosystem recovery were examined to provide a scientific basis for soil water conservation and ecological restoration of the Xilingol grassland. The results showed that:(l) Soil physical properties were correlated with the length of time since the beginning of grassland restoration. In particular, in terms of soil texture,it was found that sand and clay content decreased, while silt increased with the increase in restoration years. Soil moisture content, total porosity, and water stable aggregate all increased and bulk density decreased in plots with longer restoration years; (2) Soil infiltration was higher in plots with longer restoration years. Initial infiltration rate and steady infiltration rate were significantly positively correlated with total porosity and water stable aggregate. At the same time,the initial infiltration rate was highly negatively correlated with soil water content and bulk density, and significantly negatively correlated with steady infiltration rate. The restoration of vegetation has significantly improved soil physical properties and infiltration of soil.