首页|放牧强度对环青海湖地区高寒草地土壤理化性质及土壤粒径分形特征的影响

放牧强度对环青海湖地区高寒草地土壤理化性质及土壤粒径分形特征的影响

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以青藏高原环青海湖地区高寒草地为研究对象,探讨放牧对土壤理化性质和土壤粒径分形特征的影响,并且分析了土壤单重分形维数与土壤理化性质及土壤粒径组成之间的关系.结果表明:(1)随放牧强度的增加,土壤质地变差,土壤黏粒、粉粒体积含量逐渐减少,砂粒体积含量逐渐增加,且随着土层深度的增加,土壤砂粒体积含量逐渐增大.(2)放牧会提高土壤中全磷含量和pH值,但会降低0～10 cm土层土壤含水量.(3)随放牧强度的增加和土层的加深,土壤单重分形维数逐渐减小.(4)土壤单重分形维数随土壤黏粒和粉粒体积含量的增加而增大,随土壤全磷、土壤全氮和土壤pH值的增加而增大,而随土壤含水量和土壤容重的增加而减小(P＜0.01).综上,土壤单重分形维数能够表征青藏高原环青海湖地区土壤质地的变化,随放牧强度的增加,土壤黏粒、粉粒体积含量和单重分形维数均逐渐减小.该研究结果可为青藏高原环青海湖地区土壤状况评价提供一定的参考依据.
Effects of Grazing Intensity on Soil Physicochemical Properties and Soil Particle Size Fractal Characteristics of Alpine Grassland in the Qinghai Lake Area
This study investigated the effects of grazing intensity on soil physicochemical properties and soil particle size fractal characteristics within alpine grassland of the Qinghai Lake region on the Qinghai-Tibet Plateau.The relationship between the soil single fractal dimension and soil physicochemical proper-ties and particle size composition was also analyzed.The results showed the following:(1)Increasing graz-ing intensity led to a textural shift towards coarser soil particles,with decreases in clay and silt volume con-tent and an increase in sand volume content.Additionally,with increasing soil depth,the volume content of soil sand gradually increased.(2)Surface soil water content declined with intensified grazing,while soil pH and phosphorus content increased.(3)The soil single fractal dimension decreased with increasing graz-ing intensity and soil depth.(4)The soil single fractal dimension increased with the volume content of soil clay and silt,soil total phosphorus,total nitrogen,and soil pH,while it decreased with soil water content and soil bulk weight(P＜0.01).In conclusion,the soil single fractal dimension effectively characterizes changes in soil texture in the Qinghai Lake region of the Tibetan Plateau.Furthermore,both the volume content of soil clay and silt and the single fractal dimension decreased with increasing grazing intensity.This study provides a useful reference for assessing soil conditions in the Qinghai Lake region of the Tibetan Plateau.

Alpine grasslandAround Qinghai LakeGrazing intensitySoil physicochemical proper-tiesSoil particle compositionSingle fractal dimension

孙彩彩、安海涛、董全民、吕卫东、杨晓霞

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青海大学畜牧兽医科学院/青海省畜牧兽医科学院/三江源区高寒草地生态教育部重点实验室/青海省高寒草地适应性管理重点实验室,青海 西宁 810016

高寒草地 环青海湖 放牧强度 土壤理化性质 土壤粒径组成 单重分形维数

国家自然科学基金联合基金国家自然科学基金地区科学基金2021年度中国科学院"西部之光"人才培养计划青海省科技厅创新团队项目

U20A2007321603432021-ZJ-901

2024

10.16742/j.zgcdxb.20240082

中国草地学报
中国农业科学院草原研究所 中国草地学会

中国草地学报

CSTPCD北大核心
影响因子：1.347
ISSN：1673-5021
年,卷(期)：2024.46(8)
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