Characteristics of rainfall redistribution in Tamarix ramosissima shrub in Minqin desert-oasis ecotone and the influencing factors
Water cycling driven by vegetation rainfall redistribution plays a significant role in the distribution and succession of terrestrial ecosystem types.However,there is currently limited attention on the rainfall redistribution process in typical shrubs in arid regions.In this paper,rainfall redistribution,meteorological factors,morphological traits of Tamarix ramosissima shrub and soil moisture in Minqin desert-oasis ecotone were observed from June to September 2020 to clarify the characteristics of rainfall redistribution in T.ramosissimashrub,and to analyze the factors influencing its rainfall redistribution.The results indicate that:1)Canopy interception,throughfall,and stemflow account for 16.3%,81.2%,and 2.5%of total rainfall,respectively.2)The characteristics of rainfall(rainfall amount,rainfall duration,and rainfall intensity)are the primary factors influencing the rainfall redistribution in T.ramosissima shrub.When the rainfall amount and rainfall duration are 1.7mm and 3 hours,respectively,stemflow can be generated.When the rainfall amount is about 3mm,the maximum water holding capacity is reached.3)The relationship between rainfall redistribution in T.ramosissima shrub and canopy morphology is influenced by rainfall characteristics.4)The funneling ratio of T.ramosissima is 4.73,which can significantly increase the soil moisture at 0-50cm depth at base of the trunk(P＜0.05).The results of this study provide data support for understanding the evolutionary pattern of ecosystem and the interaction mechanism between vegetation and hydrological processes in arid land.
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