Water balance change for a re-vegetated xerophyte shrub area/Changement du bilan hydrique d’une zone replantée d’arbustes xérophiles
Water balance change for a re-vegetated xerophyte shrub area/Changement du bilan hydrique d’une zone replantée d’arbustes xérophiles
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DOI：
10.1623/hysj.49.2.283.34841
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发表时间：
2004-04
影响因子：
3.5
通讯作者：
Xin‐ping Wang;R. Berndtsson;Xin‐rong Li;E. Kang
中科院分区：
文献类型：
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作者：
Xin‐ping Wang;R. Berndtsson;Xin‐rong Li;E. Kang
摘要 摘要 利用自动称重式蒸渗仪对中国沙坡头腾格里沙漠东南部1990-1995年生长季旱生灌木（Caragana korshinskii）重新植被区与裸露地表的水平衡进行了比较。这项为期六年的实验显示了裸露沙丘地区和重新植被覆盖的沙丘地区日常水平衡的主要组成部分可能会发生怎样的变化。来自 C. korshinskii 蒸渗仪的蒸散量代表了水平衡的主要部分。年平均 ET/P 比率在 69% 到 142% 之间变化。植被蒸渗仪未观察到渗漏。另一方面，对于裸露的渗漏计，每年观测到的降雨量中有 48 毫米或 27% 以渗漏形式发生。这些结果表明，用旱生灌木重新种植大片沙地可以减少蒸腾作用下的土壤储水量。此外，实验结果表明，大面积沙地重新植被可以显着改变地下水补给条件。然而，从沙漠生态系统重建的角度来看，自然降雨似乎可以维持旱生灌木（如C. korshinskii）的生长，从而减少沙子的侵蚀损失。然而，植被恢复必须与当地居民的补给/地下水需求相平衡。
Abstract Abstract Water balances for a re-vegetated xerophyte shrub (Caragana korshinskii) area were compared to that of a bare surface area by using auto-weighing type lysimeters during the 1990–1995 growing seasons at the southeast Tengger Desert, Shapotou, China. The six-year experiment displayed how major daily water balance components might vary for a bare and a re-vegetated sand dune area. Evapotranspiration from the C. korshinskii lysimeter represented a major part of the water balance. The average annual ET/P ratios varied between 69 and 142%. No seepage was observed for the vegetated lysimeter. For the bare lysimeter, on the other hand, 48 mm or 27% of observed rainfall per year occurred as seepage. These results suggest that re-vegetating large sandy areas with xerophytic shrubs could reduce soil water storage by transpiration. Also, the experimental results indicate that re-vegetating large sandy areas could significantly change groundwater recharge conditions. However, from a viewpoint of desert ecosystem reconstruction, it appears that natural rainfall can sustain xerophytic shrubs such as C. korshinskii which would reduce erosion loss of sand. However, re-vegetation has to be balanced with recharge/groundwater needs of local populations.