胡杨(Populus euphratica)蒸腾耗水对小降雨事件的响应

doi:10.7522/j.issn.1000-694X.2016.00097

摘要/Abstract

摘要： 利用内蒙古额济纳旗1960——2010年逐日降水量观测资料，并连续监测了2012——2013年胡杨蒸腾速率和实时降水量，研究了小降雨事件对荒漠河岸林胡杨蒸腾耗水的影响。结果表明：50年来额济纳旗小降雨事件占总降雨事件的比例达90.63%。不同量级的小降雨事件对蒸腾速率的影响存在较大差异，小于1 mm的降雨发生前蒸腾速率处于下降趋势，降雨发生后蒸腾速率的下降幅度变小，2 h后开始缓慢上升；1~4 mm降雨发生前蒸腾速率呈大幅下降趋势，降雨发生后1~2 h蒸腾速率基本不变，降雨发生3~4 h后蒸腾速率显著上升。小降雨事件对胡杨蒸腾耗水量的影响存在明显的时滞效应，0.2 mm降水发生对其后各日蒸腾耗水量影响不大，降雨发生当日蒸腾耗水量的变化仍延续前几天蒸腾耗水量的变化趋势；0.4~0.8 mm降雨量发生对其后2 d内胡杨蒸腾耗水量有微弱影响，对2 d后的蒸腾耗水量影响不大；1~4 mm降雨发生后，第1天胡杨的蒸腾耗水量显著降低，但降雨后第2天胡杨蒸腾耗水量明显增加。降雨量和蒸腾速率的指数拟合关系表明小降雨事件对降雨后4 h胡杨蒸腾速率的影响最大；对降雨后1 h的蒸腾速率影响较小。

关键词: 小降雨事件, 蒸腾耗水, 胡杨, 荒漠河岸林

Abstract: Based on daily precipitation date of meteorological station in Ejina during 1960-2010 and transpiration of Populus euphratica were monitoring simultaneously with precipitation in 2012, 2013, respectively. Responses of transpiration to small rainfall events in desert riparian forest were studied. The results show that the frequency of small rainfall events reached 90.63%. The influence of small rainfall events on transpiration were changed with the mounts of rainfall. The transpiration was declined before <1 mm rainfall, but after rainfall the transpiration declined slowly, then increased after 2h. The transpiration decreased significantly before 1-4 mm rainfall, after rainfall transpiration remain unchanged at first 1-2 h, then increase quickly after 3-4 h. The effects of small rainfall events on transpiration exist time lag effect. The 0.2 mm rainfall has a little effect on transpiration, the variation trend was same as the day before rainfall. The influence of 0.4-0.8 mm rainfall was not noticeable after two days. The 1-4 mm small rainfall events have a great influence on transpiration and led to the decrease of transpiration in the first day after rainfall and led to the increase of transpiration in the second day after rainfall. transpiration of populus euphratica showed exponential correlation to small rainfall events and the influence of rainfall on transpiration was most significantly after 4 h and was not noticeable after 1 h.

Key words: small rainfall events, transpiration, Populus euphratica, desert riparian forest

中图分类号:

Q948.11

赵春彦, 司建华, 冯起, 鱼腾飞, 李培都. 胡杨(Populus euphratica)蒸腾耗水对小降雨事件的响应[J]. 中国沙漠, 2017, 37(5): 942-949.

Zhao Chunyan, Si Jianhua, Feng Qi, Yu Tengfei, Li Peidu. Responses of Transpiration of Populus euphraticato Small Rainfall Events in Desert Riparian Forest[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(5): 942-949.

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