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中文摘要：
以陇中黄土高原安家沟小流域的油松人工林为对象,于2011年生长季（5—9月）观测其林外降雨、穿透雨、树干茎流及林冠结构特征,采用修正的Gash解析模型模拟林冠截留,研究油松人工林的生态水文过程及影响机理.结果表明：研究期间共观测到19次降雨事件,总降雨量为215.80mm,其中林冠截留48.27mm,占总降雨量的22.4%;穿透雨165.24mm,占同期林外降雨量的76.7%;树干茎流量2.29mm,占同期降雨量的1.1%.模拟的林冠截留量为41.24mm,比实测值低7.13mm,相对误差为14.7%,其中,33.8%和60.0%截留分别在降雨期间和降雨之后蒸发.修正的Gash解析模型对林冠盖度、林冠持水能力、蒸发和雨强有较强的敏感性,而对树干茎流率和树干持水能力的敏感性不高.
英文摘要：
Taking the Pinus tabulaeformis plantation in the Anjiagou catchment on Longzhong Loess Plateau as test object, an observation was made on the characteristics of throughfall, stemflow, interception, and canopy structure of P. tabulaeformi during its growth season （from May to September） in 2011. Based on the observed data, the revised Gash analytical model was adopted to simulate the canopy interception, aimed to understand the ecological hydrological processes of Pinus tabulaeformis plantation and related mechanisms. In the observation period, a total of 19 precipitation events were observed, with a total precipitation of 215.80 mm. The throughfall, stemflow, and canopy interception were 165.24 mm, 2.29 mm, and 48.27 mm, occupying 76.7%, 1.1%, and 22.4 % of the total precipitation, respectively. The simulated canopy interception was 41.24 mm, being 7.13 mm lower than the observed value and with a relative error of 14.7%. There were 33.8% and 60.0% of interception were evaporated from the canopy during and after precipitation, respectively. The revised Gash analytical model was highly sensitive to the canopy storage capacity, forest coverage, rainfall intensity, and evaporation, but less sensitive to the stemflow rate and stem water holding capacity.
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