高潜水位矿区不同复垦方式下土壤热导率及其影响因素

发布时间：2018-01-31 00:29

本文关键词： 高潜水位矿区复垦土壤复垦方式土壤热导率　出处：《水土保持学报》2017年03期 　论文类型：期刊论文

【摘要】：以东部高潜水位采煤塌陷复垦耕地为研究对象,研究挖深垫浅复垦、充填复垦、预复垦3种复垦方式下土壤热导率的分布及原因。在3种复垦方式典型样地上开挖剖面,分别取0—20,20—40,40—60cm土层土样,经实验分析观测土壤热导率及相关物理指标。结果表明:(1)复垦方式、剖面层次和二者交互作用均是使热导率产生显著差别的因素(p0.01),对土壤热导率总体变异的贡献率分别为86.8%,89.6%,71.9%;(2)土壤热导率随土壤剖面深度增加呈先增加后降低的""型变化趋势;(3)复垦可以显著(p0.05)影响土壤热导率大小,并增加其在不同剖面层次上分布的差异;(4)在含水量和温度差异不大的条件下,土壤容重在1.205~1.593g/cm3时,砂粒含量为影响热导率的主要因素,当土壤容重在1.604~1.813g/cm3时,容重为影响热导率的主要因素。与未塌陷耕地相比,复垦土壤热导率偏低,在土层间分布差异性增加,因此应综合考虑容重和质地,从降低土壤容重的角度入手,改良复垦土壤热导率。
[Abstract]:Taking the coal mining collapse of the eastern part of the area as the research object, this paper studies the shallow reclamation and filling reclamation of the deep submersible. The distribution and cause of soil thermal conductivity under three kinds of pre-reclamation methods. The soil samples of 0-20 ~ (20) ~ (40) ~ (40) ~ (40) cm were taken from the typical ground excavation section of three different reclamation methods. The soil thermal conductivity and related physical indexes were observed through experimental analysis. The results showed that the reclamation mode, the level of section and the interaction between them were all the factors that caused the significant difference in thermal conductivity (p 0.01). The contribution rate to the total variation of soil thermal conductivity was 86.8% and 89.6%, respectively. (2) the soil thermal conductivity increased firstly and then decreased with the increase of soil depth. (3) Reclamation can significantly affect soil thermal conductivity and increase its distribution at different profile levels. (4) when the soil bulk density was 1.205 ~ 1.593g / cm ~ 3, the sand content was the main factor affecting the thermal conductivity under the condition of little difference between water content and temperature. When the bulk density of the soil was 1.604 ~ 1.813g / cm ~ 3, the bulk density was the main factor affecting the thermal conductivity. Compared with the uncollapsed cultivated land, the thermal conductivity of the reclaimed soil was lower, and the difference of soil distribution was increased. Therefore, comprehensive consideration should be given to bulk density and texture to improve the thermal conductivity of reclaimed soil from the point of view of reducing soil bulk density.
【作者单位】：山东农业大学资源与环境学院;
【基金】：国家自然科学基金项目(41171425)
【分类号】：S152
【正文快照】： 从2000年起,国家每年投入数十亿元进行采煤塌陷耕地复垦工作[1],这对保护我国耕地数量和粮食安全有重要意义。但复垦耕地质量偏低目前仍是棘手且严峻的问题[2-4],因此复垦耕地土壤质量引起越来越多的学者的重视。国内外学者在复垦土壤质量研究方面取得巨大成就。王平等[5]在山

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