压实新土体水分动态研究

发布时间：2018-07-26 07:19

【摘要】：新土体是资源化利用矿化垃圾和采矿、采石场弃渣石配置而成的工矿企业污染场地植被修复生长基质。为了提高新土体的持水能力,解除弃渣场、尾矿库等困难立地条件下土壤水分对植物存活、生长的制约,本试验对新土体进行不同程度的机械压实,对10~100cm的土壤含水量进行为期2年的观测,在不同的时间尺度上分析土壤水分动态变化特征。研究结果表明:1)压实显著提高新土体含水量和持水能力。2)由于持水能力增加,重度压实区月平均含水量峰值滞后于月降水量峰值,对照及轻度压实区月平均含水量峰值与月降水量峰值时间一致。3)轻度压实区不同深度的土壤月平均含水量与降水量具有非线性相关关系,重度压实区下层含水量与降水量相关性不显著。4)雨季新土体含水量由雨前含水量和降雨量决定,决定系数为0.657~0.861。随着压实度增加,雨前含水量和降雨量的影响增加。5)随着土壤深度增加,土壤含水量的波动幅度下降,60~100cm土层在观测期间仅接受过1次降雨补给。
[Abstract]:The new soil mass is the growth substrate of vegetation restoration in polluted sites of industrial and mining enterprises, which is formed by using mineralized garbage and mining and disposing of abandoned slag in quarries. In order to improve the water holding capacity of new soil and to remove the restriction of soil moisture on plant survival and growth under difficult site conditions such as abandoned slag field and tailings reservoir, this experiment compacted the new soil with different degrees of mechanical compaction. The soil moisture content of 10~100cm was observed for 2 years, and the dynamic characteristics of soil moisture were analyzed on different time scales. The results show that the water content and water holding capacity of new soil are significantly improved by compaction. 2) the peak value of monthly average water content in heavy compaction area lags behind the peak of monthly precipitation due to the increase of water holding capacity. The peak of monthly average water content was the same as the peak time of monthly precipitation in the control and mild compaction areas (3. 3) there was a nonlinear correlation between monthly average water content and precipitation in different depth of soil in mild compaction area. There is no significant correlation between the water content of the lower layer and the precipitation in the heavy compaction area) the new soil water content in the rainy season is determined by the water content before the rain and the rainfall, and the determining coefficient is 0.657 ~ (0.861). With the increase of compaction degree, the effect of water content and rainfall before rainfall increased by 5. 5) with the increase of soil depth, the fluctuation range of soil water content decreased to 60 ~ 100 cm soil layer only received one rainfall recharge during the observation period.
【作者单位】：轻工业环境保护研究所;北京林业大学水土保持学院;
【分类号】：S152.7

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