ISWC OpenIR  > 水保所知识产出(1956---)
砒砂岩区排土场新构土体保水效应研究
任志胜1; 申卫博1,2; 解倩1; 王彤彤1; 郑纪勇1,2
2016
Source Publication土壤学报
Volume53Issue:5Pages:1148-1158
Abstract

以晋陕蒙露天煤矿区排土场为研究对象,利用土壤水分定位试验观测数据,研究了
不同复配方式人工新构土体水分时空变化规律。结果表明:(1)排土场土体年内变化周期可分为雨
季丰水期(7月—10月)和旱季贫水期(11月—翌年6月),土壤水分主要受自然降雨、蒸散、底层
渗漏的影响;(2)与无防渗层土体相比,7月—10月雨量丰沛期防渗层的水分蓄积作用明显,较对
照高9.65%~13%,防渗层处理的土体底层体积含水量增加了21.6%,砒砂岩防渗层、工程防渗布在
蓄积水分上并没有显著差异;(3)风化煤增加了表层土体蒸发损失,不利于土体的持水性的提高;
砒砂岩增加了土体剖面持水能力,相对于沙黄土,复配土体0~30 cm层次土壤体积含水量增加约
3.36%~9.57%,30~40 cm底层约增加11.16%~13.65%。综合来看,砒砂岩掺混显著增强了土体的持
水蓄水能力,防渗层有效截留渗漏水分并持续供给土体,对涵养土壤水库有积极作用。

Other Abstract

【Objective】The Shanxi-Shaanxi-Inner Mongolia adjacent region is one of the most important
coal energy bases in China,and also one of those the most fragile in ecology. In recent years,the ecological
system and the landform therein has been severely and widely destructed as a result of the environment of
opencast coal mining,which has also triggered a series of ecological and safety crises. And then how to rapidly
and effectively improve the reconstructed soil(especially in soil water holding capacity)on a large scale
at overburden disposal sites formed during coal mining has become an important scientific problem to land
reclamation and ecosystem restoration. At present,the soil in these sites has some main problems,that is,
relatively thin in soil layer(less than 50 cm),and relatively coarse in texture,(over 70%,sands 0.02~2
mm in particle size),which means that the soil is rather low in water holding capacity. Besides,in the arid
and semi-arid region,the precious soil moisture is mostly lost through evaporation and leakage. To save as
much as possible soil water from evaporating and leaching,a series of measures are designed and adopted,
such as incorporating soft sandstone,which contains about 30% of montmorillonite and weathered coal into
the local sandy loess,and spread a layer of soft sandstone or a water-proof plastic sheet underneath the soil to
prevent water leaching.【Method】In order to investigate dynamics of soil moisture content in reconstructed
soils relative to composition pattern(sandy loess,soft sandstone,weathered coal)and impervious layer
(soft sandstone or plastic sheet),an experiment was carried out,designed to have 6 treatments and 3
replicates for each treatment,making up a total of 18 experimental plots. 【Result】Results show as follows.
(1)The overburden disposal sites are subject to a wet season(July-October)and a dry season(November-
June)in a year as affected by the climate in the region,and natural rainfall,evapotranspiration and leaching
are the main factors affecting the soil moisture content therein;(2)During the wet season when rainfall
is rich,the effect of the existence of a impervious layer was significant,raising soil moisture content by
9.65%~13% in the soil body as a whole(p< 0.05,the same below)and by 21.6% in the bottom layer
as compared with their respective treatments without the layer,but no significant difference was observed
between the treatments with soft sandstone as impermeable layer and the treatments with plastic sheets in
the effect. However,on the other hand,the existence of an impervious layer weakened temporal and spatial
stability of soil moisture,especially in deep soil layers;(3)Incorporation of weathered coal increased
soil water loss through surface evaporation,which is no good to improving soil water holding capacity,while
incorporation of soft sandstone affected soil water holding capacity reversely. So in the practice,it still calls
for further study on feasibility of the use of weathered coal as soil amendment from the view point of efficient
utilization of water sources. Incorporation of soft sandstone increased soil water content by 3.36%~9.57% in
the 0~30 cm layer and 11.16%~13.65% in the 30~40 cm layer. In addition,laying of an impervious layer
is more effective than incorporation of soft sandstone and/or weathered coal in increasing water content of theartificial soils in the overburden disposal sites. 【Conclusion】To sum up,incorporation of soft sandstone
significantly enhances the soil water retention and water holding capacity of the soil,and the impervious layer
effectively controls soil water leaching and hence has a positive effect on soil holding water like a reservoir.
Besides illustrating the effects of the soil amelioration measures on spatial and temporal variation of soil
moisture content and the improvement of soil water regime,the study provides some references for choosing
schemes for reconstruction of farmland soil using different components in mining areas.

Keyword晋陕蒙矿区 砒砂岩 排土场 新构土体 土壤体积含水量
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8753
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学资源环境学院
2.中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室
Recommended Citation
GB/T 7714
任志胜,申卫博,解倩,等. 砒砂岩区排土场新构土体保水效应研究[J]. 土壤学报,2016,53(5):1148-1158.
APA 任志胜,申卫博,解倩,王彤彤,&郑纪勇.(2016).砒砂岩区排土场新构土体保水效应研究.土壤学报,53(5),1148-1158.
MLA 任志胜,et al."砒砂岩区排土场新构土体保水效应研究".土壤学报 53.5(2016):1148-1158.
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