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冻融循环对黄土区土壤饱和导水率影响的试验研究
赵春雷1,3; 贾小旭2
2015
Source Publication土 壤 通 报
Volume46Issue:1Pages:68-73
Abstract

为探明黄土高原北部冻融过程对土壤饱和导水率的影响,采用冻融循环模拟的方法,分析了不同土地利用和不同
土层深度下冻融循环前后土壤饱和导水率(Ks)的变化特征。结果表明:冻融过程对 Ks有显著影响,经 15 次冻融循环后,Ks
总体上呈减小趋势,其影响程度因土地利用类型和土层深度不同而异。冻融循环后 4 种土地利用 0 ~ 10 cm 土层 Ks均显著
下降,柠条林地下降幅度最大,其次为农地、苜蓿地和撂荒地,这与土壤的松散程度有关。除撂荒地外,冻融循环过程对其它
3 种土地利用 10 ~ 20 和 20 ~ 40 cm 土层 Ks无显著影响。4 种土地利用 0 ~ 10 cm 土壤田间持水量和饱和含水量经冻融循
环后均有不同程度下降,表明冻融循环后土壤孔隙度降低度降低。研究可为揭示冻融循环对黄土区土壤饱和导水率的影响
机理以及为土壤水分匮乏的寒区旱区春季降水及积雪融水的高效利用提供理论依据。

Other Abstract

To clarify the effects of freeze-thaw cycles on saturated soil hydraulic conductivity (Ks) in the northern
Loess Plateau,the variation characteristics ofKs atdifferentsoildepths before and after freeze-thaw cycles under the
differentland uses were determ ined using the m ethod of the freeze-thaw cycles sim ulation.Results showed that the
freeze-thaw cycles had significanteffects on Ks.The values ofKs generally decreased after15 freeze-thaw cycles,and
the degree of the decrease varied with different land uses and soil depth. Ks at the soil depth of 0 - 10 cm
significantly decreased underthe fourland uses,and the degree ofthe decrease in Ks was the highestunderCaragana
korshinskii land,followed by cropland,alfalfa land,and fallow land,which m ay be related to the soildensity.Except
forfallow land,freeze-thaw cycles had no obvious effecton Ks underthe otherthree land uses atthe soildepths of10
- 20 and 20 - 40 cm .The field capacity and saturated soilwater contentatthe depth of0 - 10 cm decreased under
the fourland uses afterfreeze-thaw cycles,suggesting a reduction in soilporosity.The results could provide theoretical
basis for the revealofresponse m echanism s ofKs to freeze-thaw cycles,and for the efficientuse ofspring rains and
snow watersources in cold and arid regions.

Keyword冻融循环 饱和导水率 入渗 土地利用 黄土区
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/361005/8383
Collection水保所知识产出(1956---)
Corresponding Author贾小旭
Affiliation1.西北农林科技大学 资源环境学院,陕西 杨凌 712100
2.中国科学院地理科学与资源研究所 生态系统网络观测与模拟重点实验室, 北京 100101
3.西北农林科技大学 黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西 杨凌 712100
Recommended Citation
GB/T 7714
赵春雷,贾小旭. 冻融循环对黄土区土壤饱和导水率影响的试验研究[J]. 土 壤 通 报,2015,46(1):68-73.
APA 赵春雷,&贾小旭.(2015).冻融循环对黄土区土壤饱和导水率影响的试验研究.土 壤 通 报,46(1),68-73.
MLA 赵春雷,et al."冻融循环对黄土区土壤饱和导水率影响的试验研究".土 壤 通 报 46.1(2015):68-73.
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