Effects of natural covers on soil evaporation of the shelterbelt along the Tarim Desert Highway

查看全文 作　　者：ZHOU [1,2,3]HongWei;LI [1]ShengYu;SUN [1,2]ShuGuo;XU [1]XinWen;LEI [1]JiaQiang;LIU [3]Shang;DU [3]WenYi;YAN [5]Zeng;WANG [4]YongChang

机构地区：[1]Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;[2]Graduate University of the Chinese Academy of Sciences,Beijing 100049,China;[3]Tarim Branch,PetroChina Company Limited,Korla 841000,China;[4]Tuha Branch,PetroChina Company Limited,Korla 839009,China;[5]不详

出　　处：《Chinese Science Bulletin》索引2008年第53卷第S2期,共9页

基　　金：Supported by Major Orientation Foundation of the CAS Innovation Program (Grant No. KZCX3-SW-342);CAS Action-Plan for West Development (Grant No. KZCX2-XB2- 13);Major Scientific and Technological Special of Xinjiang Uygur Autonomous Region (Grant No. 200733144-3);National Natural Science Foundation of China (Grant No. 40701098);the research projects of the Tarim Branch of PetroChina Company Limited (Grant Nos. 971008090016 and 971008090017);CAS Xinjiang Institute of Ecology and Geography 'Dr. Talent' Project of Oasis Scholars Training Plan 摘　　要：The control of soil evaporation is one of important approaches to save water. The artificially simulated evaporation experiments have been conducted in the hinterland of the Taklimakan Desert to reveal the effects of the natural covers on the soil evaporation of the Tarim Desert Highway shelterbelt as well as provide some insights in the efficient utilization of water resources and optimization of irrigation systems. The results showed that (1) All the covers, including the sand deposit, the salt crust, the litter, the sand-litter mixed layer and so on, can significantly inhibit the soil water evaporation. Specifically, the daily evaporation, the total evaporation, and the evaporation rate in covered sands were much smaller than that of sands without cover. The cover inhibition effects increased with the cover thickness. Particularly, the soil evaporation of the covered sands was less affected by external and internal factors than that of the bare sands. Moreover, the variation of daily evaporation of covered sands was smaller than that of bare sands. The cumulative evaporation varied linearly with time in the covered sands whereas it varied logarithmically in the bare sands. In addition, the soil evaporation in the bare sands showed significantly different characteristics in the early and late stages of the evaporation. (2) All the covers exhibited the significant inhibiting effect on the soil evaporation, and the inhibition efficiency increased logarithmically with the cover thickness. However, as the cover thickness was above a certain value, the increase in the inhibition efficiency was slow. Particularly, at a cover thickness of 2 cm, there was no obvious difference in the inhibition efficiency among all kinds of covers. The maximum inhibition efficiency as calculated from the daily evaporation on the first day of irrigation was: sand-litter mixed layer (79.92%) > litter layer (78.96%) > salt crust (75.58%) > sand bed (74.11%), whereas the average inhibiting efficiency as calculated from the cumulative soil evaporation at the end of an irrigation cycle (the fourth day) was: salt crust (67.78%) > sand-litter mixed layer (66.72%) > sand deposit (63.28%) > litter layer (61.74%). 关键词：Taklimakan DESERT SHELTERBELT IRRIGATION COVER soil EVAPORATION inhibition efficiency

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Effects of natural covers on soil evaporation of the shelterbelt along the Tarim Desert Highway

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