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根据ETM+遥感影像与实地考察数据,通过建立乔木层物种多样性反演模型及模型地面验证等方法,对辽东山区水源涵养林乔木层物种多样性分布格局及其在不同海拔高度和坡向上的分布状况进行了研究。结果表明:归一化植被指数(NDVI)、湿度(TC3)和绿度(TC2)与Shannon-Wiener多样性指数相关性较高,3个植被指数与Shannon-Wiener多样性指数的回归模型可靠(R2=0.637,P<0.01)。地面验证结果表明,模型能解释乔木层物种多样性的69.38%;乔木层物种多样性指数主要集中在1.0~2.2,并符合“中间海拔高度膨胀”理论;坡向对乔木层物种多样性分布的影响体现在东北坡出现高物种多样性的可能性最大,验证了由于坡向导致的水热差异,从而影响物种多样性的结论。
Based on ETM + remote sensing images and field investigation data, the distribution patterns of tree species diversity and its distribution at different altitudes and slopes in water conservation forests of eastern Liaoning Province were established through the establishment of tree layer species diversity inversion model and model ground validation. The situation was studied. The results showed that NDVI, TC3 and TC2 were highly correlated with Shannon-Wiener diversity index, and the regression models of three vegetation indices and Shannon-Wiener diversity index were reliable R2 = 0.637, P <0.01). The results of surface validation showed that the model can explain 69.38% of species diversity in arbor layer and species diversity index of arbor layer mainly in 1.0-2.2, which accords with the theory of “middle altitude expansion” The distribution is reflected in the fact that there is a high probability of occurrence of high species diversity on the northeast slope, which confirms the conclusion that species diversity is affected by differences in water and heat due to aspect.