| 荒漠灌丛内降雨和土壤水分再分配 |
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| 引用本文： | 王正宁,王新平,刘博. 荒漠灌丛内降雨和土壤水分再分配[J]. 生态学杂志, 2016, 27(3): 755-760. DOI: 10.13287/j.1001-9332.201603.029 |
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| 作者姓名： | 王正宁 王新平 刘博 |
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| 作者单位： | 1.福建农林大学林学院, 福州 350002;;2.中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站, 兰州 730000 |
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| 基金项目： | 本文由国家自然科学基金项目(41371101)资助 |
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| 摘 要： | 通过对降雨再分配,荒漠灌丛可改变降雨在灌丛内的水平空间分布,进而影响植被冠层下土壤水分的空间响应.本文以腾格里沙漠东南缘人工植被区柠条和油蒿灌丛为研究对象,分析了灌丛干扰下的降雨再分配过程及灌丛下土壤水分的空间响应.结果表明: 柠条和油蒿灌丛的穿透水、树干茎流分别占降雨量的74.4%、11.3%和61.8%、5.5%.次降雨过程中,柠条和油蒿穿透水空间变异性均较大,平均变异系数分别为0.25和0.30;由于可以将更多的降雨以树干茎流形式在根部富集,柠条主干基部土壤湿润锋深度明显比冠层其余位置深,而油蒿仅在大降雨事件时才较为明显.灌丛对降雨的再分配作用改变了降雨达到地表时的空间分配,致使冠层下土壤湿润锋深度呈现明显的不均一性.
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| 关 键 词： | 柠条 油蒿 树干茎流 土壤湿润锋 |
| 收稿时间： | 2015-08-24 |
Rainfall and soil moisture redistribution induced by xerophytic shrubs in an arid desert ecosystem |
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| WANG Zheng-ning,WANG Xin-ping,LIU Bo. Rainfall and soil moisture redistribution induced by xerophytic shrubs in an arid desert ecosystem[J]. Chinese Journal of Ecology, 2016, 27(3): 755-760. DOI: 10.13287/j.1001-9332.201603.029 |
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| Authors: | WANG Zheng-ning WANG Xin-ping LIU Bo |
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| Affiliation: | 1.College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
;2.Shapotou Desert Experimental and Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | Rainfall partitioning by desert shrub canopy modifies the redistribution of incident rainfall under the canopy, and may affect the distribution pattern of soil moisture around the plant. This study examined the distribution of rainfall and the response of soil moisture beneath the canopy of two dominant desert shrubs, Caragana korshinskii and Artemisia ordosica, in the revegetation area at the southeastern edge of the Tengger Desert. The results showed that throughfall and stemflow ave-ragely occupied 74.4%, 11.3% and 61.8%, 5.5% of the gross precipitation for C. korshinskii and A. ordosica, respectively. The mean coefficients of variation (CV) of throughfall were 0.25 and 0.30, respectively. C. korshinski were more efficient than A. ordosica on stemflow generation. The depth of soil wetting front around the stem area was greater than other areas under shrub canopy for C. korshinski, and it was only significantly greater under bigger rain events for A. ordosica. The shrub canopy could cause the unevenness of soil wetting front under the canopy in consequence of rainfall redistribution induced by xerophytic shrub. |
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| Keywords: | Caragana korshinskii Artemisia ordosica stemflow soil wetting front |
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