丽水市莲都区生态公益林资源结构动态变化研究

根据1999年和2008年公益林区两期的森林资源调查数据,采用对比分析和数理统计方法,从时间尺度上对公益林区的森林资源格局动态变化情况进行了研究,掌握了莲都区公益林在林龄、郁闭度、疏密度、森林类型等方面的变化情况。通过1999年到2008年的十年建设,幼、中龄林与近、成、过熟林面积比例由78:22演变到40:60,蓄积比由54:46演变到23:77;低郁闭度(郁闭度小于0.7)林分由76.57%下降到25.14%,高郁闭度林分则从23.43%上升到74.86%;阔叶林面积占比从11.43%增加到11.57%,针阔混交林面积从26.86%增加到40.29%;单位面积平均蓄积从25.65 m3·hm-2增长到37.95 m3·hm-2,年均净增率4.30%。

Dynamic analysis of Public Welfare Forest resouce in Liandu

Two detailed investigation of Public Welfare Forest resouce in 1999 and 2008 ,using the method of comparative analysis and mathematical statistics, dynamic change of public welfare forest resources in Liandou Lishui,Zhejiang were studied, from which the Dynamic change of forest age, crown density, density, forest type, etc were mastered. Through ten years construction from 1999 to 2008, the area proportion of Young mid-maturation forest and mature or over-mature forests was changed from 78：22 to 40：60, meanwhile the stand volume proportion was changed from54：46 to 23：77; the Low canopy density （crown density is less than 0.7） forest decline from 76.57% to 25.14%,the high canopy density stand has increased from 23.43% to 23.43%; Broad-leaved forest area proportion increased from 11.43% to 11.57%, mixed needle leaf area proportion increased from 26.86% to 40.29%; Average stand volume increased from 25.65 m3.hm-2 to 37.95 m3-hm-2, which has an annual net gain of 4.30%.