Evapotranspiration of Caragana korshinskii communities in a revegetated desert area: Tengger Desert, China
Evapotranspiration of Caragana korshinskii communities in a revegetated desert area: Tengger Desert, China
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DOI：
10.1002/hyp.5661
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发表时间：
2004-12
影响因子：
3.2
通讯作者：
Xin‐ping Wang;C. Brown-Mitic;E. Kang;Jingguang Zhang;Xin‐rong Li
中科院分区：
文献类型：
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作者：
Xin‐ping Wang;C. Brown-Mitic;E. Kang;Jingguang Zhang;Xin‐rong Li
沙坡头沙漠试验站40多年来以柠条为主要植被，在稳定的沙丘上建立了矮灌丛和草本覆盖。采用自动称重法测定了1990 ~ 1995年柠条矮灌木群落的蒸散量（ET）和裸地的蒸发量(E)。6年平均ET速率为0.83 mm d - 1，变化范围为0.71 ~ 1.06 mm d - 1。月ET变化范围为0.14 ~ 2.35 mm d−1，月降水(P)变化范围为0 ~ 3.12 mm d−1。月ET/P比率从0.94到1.28不等，总体平均为97.4%。这个地区的降水通常集中在六月到九月之间。1991年降水量最少，主要集中在4月和5月。降水的这种时间异常导致6年期间最高的ET/P比值（0.33）和土壤水分耗竭（ΔS = - 31.5 mm）。自然降水条件下沙坡头周边植被沙丘的蒸散发占潜在蒸发量的12.2%。累积P与累积ET、E高度相关，ET = 0.80p + 0.10, E = 0.55p + 5.89，线性关系明确，回归R2范围为0.953 ~ 0.985。然而，1991年的ET和E的回归方程与其他年份有很大的不同，由于降水模式的异常，斜率更陡，截距为负。版权所有©2004 John Wiley & Sons， Ltd
More than 40 years of revegetation using mainly Caragana korshinskii at Shapotou Desert Experimental Research Station in China has established a dwarf‐shrub and herbaceous cover on the stabilized sand dunes. The evapotranspiration (ET) of the dwarf‐shrub C. korshinskii community and the evaporation (E) of the bare soil were measured by the auto‐weighing lysimeter method during the growing seasons from 1990 to 1995. The average ET rate was 0·83 mm d−1, which varied from 0·71 to 1·06 mm d−1 during the 6‐year period. Monthly ET ranged from 0·14 to 2·35 mm d−1, with a monthly precipitation (P) range of 0 to 3·12 mm d−1. Monthly ET/P ratios varied from 0·94 to 1·28 and averaged 97·4% overall. Most of the precipitation in this area usually falls between June and September. The lowest precipitation was recorded in 1991, with most of it falling during April and May. This temporal anomaly in the precipitation resulted in the highest ET/P ratio (by 0·33) and soil moisture depletion (ΔS = −31·5 mm) for the 6‐year period. ET from the revegetated sand dunes around Shapotou under natural precipitation may account for 12·2% of the potential evaporation. Cumulative P and cumulative ET and E were highly correlated, with a well‐defined linear relationship of ET = 0·80P + 10·0 and E = 0·55P + 5·89, with regression R2 ranging from 0·953 to 0·985. In 1991, however, the regression equations for both ET and E were considerably different than the other years, with a steeper slope and a negative intercept resulting from the anomaly in the precipitation pattern. Copyright © 2004 John Wiley & Sons, Ltd.