古尔班通古特沙漠南缘丘间地梭梭群落蒸散特征

doi:10.12118/j.issn.1000-6060.2018.06.18

Abstract

Abstract: According to the observed data about soil moisture and meteorological elements at the fixed observation points for Haloxylon ammodendron in the interdune lowland at the Southern Edge of Gurbantunggut Desert,Xinjiang,China,during the growing season (from April 1 to October 31) in 2016,their evapotranspiration was estimated based on the principle of water balance and the evapotranspiration change law was analyzed.The results showed as follows:(1) During their growing season of Haloxylon ammodendron,the precipitation was 206.7 mm.The distribution of precipitation in the experimental area was uneven,and it had the maximum precipitation during the Haloxylon ammodendron germination period.The precipitation was decreased month by month during the strong growth period of Haloxylon ammodendron,and the precipitation was the least when the Haloxylon ammodendron starts to wither and fall. (2) During the growing season of Haloxylon ammodendron,the water storage from the 0~400 cm soil layer of Haloxylon ammodendron community showed a decreasing trend.Meanwhile,the soil moisture was quickly replenished during the Haloxylon germination period and it is reduced at other stages.The Haloxylon ammodendron community relied on soil water storage accumulated before the growth season to compensate for the water shortage in the growth season of Haloxylon ammodendron community. (3) The evapotranspiration of the growth season of Haloxylon ammodendron community showed an obvious multi-peak curve,and the peak occurred mainly in the concentrating period of rainfall,the lowest value of evapotranspiration appears in the soil water storage loss period. (4) During the growing season,the rate of increase of the cumulative evapotranspiration was always higher than that of the accumulated precipitation,and the cumulative evapotranspiration was bigger than the cumulative precipitation.

Key words: Gurbantunggut Desert, Haloxylon ammodendron community, water balance, evapotranspiration, precipitation, soil water storage

CLC Number:

P426.2

WANG Ze-feng, HU Shun-jun, LI Hao. Evapotranspiration characteristics of Haloxylon ammodendron community in interdune lowland at the southern edge of Gurbantunggut Desert[J].干旱区地理, 2018, 41(6): 1303-1309.

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Evapotranspiration characteristics of Haloxylon ammodendron community in interdune lowland at the southern edge of Gurbantunggut Desert

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