黄土丘陵区典型牧草对土壤理化性质的影响

Effects of Typical Herbage on Soil Physical and Chemical Properties in Loess Hilly Region

摘要: 本研究选取位于内蒙古东南部的林格尔县中部黄土丘陵区，设置径流小区，在径流小区内选择种植当地的优势草种：苜蓿、草木樨和冰草，并与裸地进行对比，分析牧草地对土壤pH值、土壤含水量、土壤颗粒组成和土壤养分的影响，进而得出能够改善土壤环境更好的草种，从而服务于当地的经济发展和生态环境，为该区域的退耕还草工作的进一步开展、水土保持措施的制定，生态环境的恢复与改善、以及实现区域发展可持续提供依据。研究结果表明，3种牧草均能改善土壤养分状况，且均在不同程度改善土壤环境，其中，冰草对土壤各个方面的效应最好，苜蓿次之，草木樨较差。

Abstract: This study selected the Loess Hilly Region in the central part of Helingeer County in the southeast of Inner Mongolia. Based on the selection of runoff plots, selecting the dominant grass species planted in the region: Agropyron cristatum (L.) Gaertn (冰草), Melilotus suaveolens Ledeb (草木樨), Medicago sativa L. (苜蓿) and bare land to analyze the effects of pasture on soil pH, soil moisture content, soil particle composition and soil nutrients. In order to obtain better grass species that can improve the soil environment, so as to serve the local economic development and ecological environment, and to further develop the returning farmland to grassland in this region, formulate soil and water conservation measures, restore and improve the ecological environment, and realize regional development, which can provide the basis for sustainable development. The results of the study showed that the three grasses all improved the soil nutrient status and improved the soil environment in varying degrees. Among them, the effect of Agropyron cristatum (L.) Gaertn on all aspects of the soil is best, followed by the Medicago sativa L. (苜蓿), and Melilotus suaveolens Ledeb is poor.