塞罕坝国家级自然保护区落桦混交林空间结构研究

Study on the Spatial Structure of Mixed Birch and Lower Birch Forest in Saihanba National Nature Reserve

通过对塞罕坝塞罕坝国家级自然保护区内落桦混交林角尺度、大小比数和混交度三个空间指数进行测定,结果表明:林分角尺度均值为0.508,为随机分布,整体分布是比较合理的;林分大小比数平均值为0.345,林分的大小比数分布的比较不分散,林分内树种的大小分化程度不大;林分混交度为405,落桦混交林混交程度并不高,处于弱度混交与中度混交之间。

Through the determination of the three spatial indices of the angle,size ratio,and mixed degree of birch mixed forests in the Saihanba National Nature Reserve of Saihanba,the results show that the average value of stand-point angles is 0.508,which is a random distribution.The distribution is relatively reasonable;the average value of stand ratios is 0.345,and the distribution of the size and number of stands is not dispersive.The degree of tree species differentiation in the forest stand is not significant;the stand mixed degree is 405,and the mixed forest of L.birch Mixed degree is not high,between weak mixed and moderate mixed.