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对已有的冠层截留模型进行改进,以ArcPy函数库为基础借助遥感和GIS模拟技术,以半小时为时间步长对井冈山保护区2012年9月~2014年8月研究森林冠层降雨截留进行了模拟。在区域尺度上利用模拟结果对森林冠层年、月降雨截留特征进行了分析。结果显示,整个保护区年均冠层降雨截留率为18.46%,截留量为257.60mm,不同森林类型区域尺度的年均截留率在17.26%~21.25%;月降雨量与各森林类型区域尺度的冠层截留率负相关,与截留量正相关。不过降雨量对截留量和截留率的解释程度分别只有约58%和72%。一个与月降雨量和月内雨量分配有关的参数Pa对月截留量的解释程度可达0.84以上,通过分析得到了利用Pa估计各森林类型月截留量的简便方法。上述模拟和分析揭示了森林冠层区域尺度上森林冠层不同时间尺度的截留特征,为保护区进行区域性长时间的水量平衡研究以及水源涵养评估和研究提供更加方便简洁的途径。
Based on the ArcPy library, based on the ArcPy function library, the canopy interception of the canopy was studied in Jinggangshan Nature Reserve from September 2012 to August 2014 with the aid of remote sensing and GIS simulation technology in half an hour as a time step A simulation was conducted. At the regional scale, the simulation results were used to analyze the annual and monthly rainfall interception characteristics of forest canopy. The results showed that the annual average canopy rainfall interception rate was 18.46%, and the interception rate was 257.60mm. The annual average interception rates of different types of forests ranged from 17.26% to 21.25%. The correlation between the monthly rainfall and the regional scale of each forest type Canopy interception rate was negatively correlated with the interception rate. However, the interpretation of rainfall on interception and retention rate is only about 58% and 72% respectively. A parameter Pa, which is related to the distribution of monthly rainfall and monthly rainfall, can be interpreted as above 0.84. According to the analysis, we can get a simple method to estimate monthly interception of each forest type by using Pa. The above simulation and analysis reveal the interception characteristics of forest canopy at different timescales at the forest canopy regional scale and provide a more convenient and concise way for regional long-term water balance study and water conservation assessment and research.