科尔沁沙地盐碱化草地及其生态修复研究进展OA

Located at the southeastern edge of the northern semi-arid agro-pastoral ecotone,the Horchin Sandy Land is the largest sandy land among China's four major sandy regions and faces prominent salinization issues.In re-cent years,under the combined effects of climate change and irrational land use,grassland degradation has intensified,and the area of salinization continues expanding.Here,we summarized the restoration techniques for salinized grass-lands in Horchin,based on the evolution of vegetation community structure,soil physicochemical properties,and micro-bial characteristics in lightly,moderately,and heavily salinized grasslands.In terms of physical measures,methods such as deep loosening and plowing,drainage and water table control,and"sand mulching to suppress alkalinity"are em-ployed to improve soil structure and block the upward movement of water and salt.For chemical measures,the applica-tion of gypsum,polymer amendments,and organic materials facilitates ion exchange,pH regulation,and soil aggregate reconstruction biological measures include grazing exclusion,planting salt-tolerant forage grasses and shrubs,microbial inoculants,and green manure rotation,which restore vegetation cover and soil nutrient cycling,enhancing ecosystem sta-bility and resilience.Future restoration efforts for salinized grasslands in Horchin should adhere to the principle of"water-determined greening"and develop an integrated"engineering-chemical-biological"restoration model.