Influence of land cover changes on the physical and chemical properties of alpine meadow soil中国科学通报：英文版论文
【题名】：Influence of land cover changes on the physical and chemical properties of alpine meadow soil中国科学通报：英文版论文(Influence of land cover changes on the physical and chemical properties of alpine meadow soilZhongGuoKeXueTongBao：YingWenBanLunWen) 【关键词】：青藏高原 高山草甸土 物理性质 化学性质 地被物变化 土壤性质 草地退化 植被 【keywords】：QingCangGaoYuan GaoShanCaoDianTu WuLiXingZhi HuaXueXingZhi DiBeiWuBianHua TuRangXingZhi CaoDiTuiHua ZhiBei 【作者】：WANGGenxu,CHENGGuodong,      【来源】： 知识词典 【期刊名称】：中国科学通报：英文版(ZhongGuoKeXueTongBao：YingWenBan) 【国际标准刊号】：1001-6538        【国内统一刊号】： 【作者单位】：[1]StateKeyLab,OffrozenSoilEngineering,ColdandAridRegionsEnvironmentalEngineeringResearchInstute,ChineseAcademyofSciences,Lanzhou730000,China [2]StateKeyLab,OffrozenSoilEngineering,ColdandAridRegionsEnviron([1]StateKeyLab,OffrozenSoilEngineering,ColdandAridRegionsEnvironmentalEngineeringResearchInstute,ChineseAcademyofSciences,Lanzhou730000,China [2]StateKeyLab,OffrozenSoilEngineering,ColdandAridRegionsEnviron) 【分类号】：S155.294       【页码】：-118-124      【出版年】：2003.2 【下载地址】：下载pdf全文         Taking the alpine cold meadow grassland in the southeastern part of the Qinghai-Tibetan Plateau as an example ,this researcdh deals with the characteristics of apline meadow soil property changes,including soil nutrients,soil physical properties and soil mositure content under differcent land coverage conditions.With the degradation of grassland vegetation and the decline of vegetation coverage ,soil compactness reduces ,gravel content increases and bulk density increases ,The originally dense root-system layer is gradually denuded,making the soil coarse and gravel .The change of the organic matter contents with the vegetation coverage change in the surface soil layer (0-20cm) has shown an obvious cubic polynomial curve process ,The organic matter contents increas rapidly when land coverage is above 60%,contrarily decreases on a large scale when land coverage is below 30%,Between 30%-60% of land coverage the organic matter contents remain stable,The total N and organic matter contents remain stable.The total N and organic matter contents in soil have shown quite similar change regularity ,Following this the mathematic equations are derived to describe such change processes ,Moisture content in soil changes sharply with the vegetation coverage change,Soil moisture content change with the vegetation coverage change,Soil moisture content change with the vegetation coverage change has shown a quadratic parabola process,Results have shown that organic matter conternt and the total N content of the apline meadow soil decrease by 14890 kg/hm^2 and 5505kg/hm^2 respectively as the vegetation coverage reduces from 90% to less than 30%,the heavey changes of soil physical and chemical proerties with grassland degradation have made the recovery of alpine meadow ecological system impossible,The protection of alpine meadow vegetation is of vital importance to the maintenance of the regional soil environment and the regional ecological system.
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