伊犁河谷草地土壤容重的变异性与测定标准化  

Soil Bulk Density Variation of Grassland in Ili Valley and the Measurement Standardization

作　　者：张文太[1] 陈诗[1] 刘耘华[1] 盛建东[1] 苏悦[1] 

机构地区：[1]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,乌鲁木齐830052

出　　处：《新疆农业科学》2017年第1期165-170,共6页Xinjiang Agricultural Sciences

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)~~

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。[ Objective] The purpose of this project is to study the variation of soil bulk density in the hor- izontal and vertical directions and the influence of the gravel content on the determination results of bulk densi- ty in the hope of promoting the standardization of soil analysis and soil resource management. [ Method] Based on field soil survey, 56 soil profiles were dug in grassland of the Ill Valley. Soils were sampled by using core method at uniformly set soil layers, and each layer was repeatedly sampled five times. Gravel content was measured in lab when it existed at a certain soil layer. The coefficient of variation （CV） was used to quantita- tively express lateral variation of soil bulk density. [ Result]The mean CV values of soil bulk densities meas- ured from five samples for all soil layers were lower than 8%. Gravel could improve soil bulk density by about 16%. Soil bulk densities of varied soil layers at vertical direction were significantly different, and bulk density increased along with increasing soil depth. [ Conclusion ] Soil layer should be rationally classified when stud- ying bulk density of soil profile in grassland. In view of the fact that highly stony soils existed in grassland of Xinjiang, we suggest that the relevant standard for measuring bulk density should be modified.

关 键 词：砾石 垂直变异 变异系数 土壤质量标准化 

分 类 号：S151.9[农业科学—土壤学]