围封对荒漠草原土壤理化特性的影响

Impact of Enclosure on Soil Physicochemical Properties in Desert Grassland

围封不仅有助于恢复草地物种多样性、提升生产力,并且有利于土壤结构与功能的维持。本研究以内蒙古苏尼特荒漠草原为研究对象,分析围封10 a对内蒙古苏尼特荒漠草原土壤理化特性的影响。结果表明:和对照样地相比,围封10 a土壤0~20 cm土层中砂粒含量降低4.7%,粉粒和黏粒含量分别增加14.4%和27.2%;围封10 a可以促进荒漠草原土壤表层0~5 cm的持水情况,但5~20 cm土层土壤持水能力降低;围封10 a土壤有机质、全碳、全氮、全钾含量分别增加22.8%、26.3%、16.6%、2.2%。研究结果可为荒漠草原制定合理的围封政策、制度提供科学依据。

Enclosure not only helps restore grassland species diversity and enhance productivity,but also helps maintain soil structure and function.Taking Sonid Desert Steppe in Inner Mongolia as research object,the impact of 10-year enclosure on the soil physicochemical properties of Sonid Desert Steppe was analyzed.The results showed that compared with the control plot,the sand content in 0-20 cm soil layer of 10-year enclosure decreased by 4.7%,while the silt and clay content increased by 14.4%and 27.2%,respectively.Enclosure for 10 years could promote the water holding capacity of 0-5 cm surface soil layer,but the water holding capacity of 5-20 cm soil layer decreased.The contents of soil organic matter,total carbon,total nitrogen and total potassium increased by 22.8%,26.3%,16.6%and 2.2%,respectively after 10-year enclosure.The results can provide scientific basis for formulating reasonable enclosure policies and systems in desert steppe.