伊犁河谷草地土壤容重的变异性与测定标准化

发布时间：2018-03-08 18:20

本文选题：砾石　切入点：垂直变异　出处：《新疆农业科学》2017年01期 　论文类型：期刊论文

【摘要】：【目的】研究剖面尺度水平方向和垂直方向土壤容重的变异性,砾石含量对容重测定结果的影响,促进土壤分析和土壤资源管理的标准化。【方法】基于野外土壤调查,在伊犁河谷草地挖掘了56个土壤剖面,按照统一设定的深度范围,用环刀法采集土样,每层土壤重复5次。当有砾石时,测定该土层的砾石含量。用变异系数定量表征水平方向土壤容重的变异性。【结果】每层土壤5次重复容重变异系数的平均值均在8%以内,存在砾石会使土壤容重偏高约16%。垂直方向不同深度范围土壤容重差异显著,容重随深度增加而升高。【结论】研究草地土壤剖面的容重时,土层深度的划分要合理。需要针对新疆草地土壤砾石含量较高的状况,修订容重测定的相关标准方法。
[Abstract]:[objective] to study the variability of soil bulk density in horizontal and vertical direction of profile and the effect of gravel content on the results of bulk density measurement, and to promote the standardization of soil analysis and soil resource management. [methods] based on field soil survey, 56 soil sections were excavated in the grassland of the Yili River Valley, and soil samples were collected with a circular knife method according to a uniformly set depth range, and repeated five times per layer of soil. The variation coefficient of soil bulk density in the horizontal direction was quantitatively characterized by the coefficient of variation. [results] the mean value of the coefficient of variation of the repeated bulk density of each layer of soil was less than 8%. The existence of gravel will cause the soil bulk density to be about 16% higher. There are significant differences in soil bulk density in different depth range in vertical direction, and the bulk density increases with increasing depth. [conclusion] when we study the bulk density of grassland soil profile, The classification of soil depth should be reasonable, and the standard method of bulk density measurement should be revised according to the situation of high gravelly content in grassland soil in Xinjiang.
【作者单位】：新疆农业大学草业与环境科学学院/新疆土壤与植物生态过程实验室;
【基金】：中国科学院战略性先导科技专项(XDA05050405) 国家自然科学基金青年基金项目(41301231) 国家大学生创新创业训练计划项目(201410758014)~~
【分类号】：S812.2

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