梅州市森林资源动态变化浅析

Dynamic Analysis of Forest Resources and Its Protection Measures in Meizhou

将广东省梅州市林地分为有林地、灌木林地、疏林地、其它林地（未成林地和无林地），利用Arc—GIS9．1软件，根据3期林地分布现状数据制成3幅梅州市林地分布图。利用梅州市1985～2005年（约5年为间隔）森林资源统计资料，对森林资源动态变化情况进行了分析和论述：林业用地面积减少389．1×10^3hm^2，有林地面积减少194．9×10^3hm^2，森林覆盖率下降了8．6％，无林地面积减少533．9×10^3hm^2，森林蓄积量增加2031．6×10^3hm^2，消耗量小于生长量。对梅州市森林资源特点作了论述：森林蓄积量偏低，但潜力大；分布不均匀，东、北部林地面积较多，其余较少；林种结构较合理，分类经营改革见成效；近熟、中、幼龄林面积比重较大，等等。力求寻找其动态变化的原因，并思考如何保护其平衡发展。

Afforested land of Meizhou is categorized into forest land, sparse land, underage land, shrub wood and non-forest land. Three maps about distributed forestry land in Meizhou are made in three respective years of 1985, 1995 and 2000 based on using ArcGIS9.1. The forest resource dynamic in Meizhou has been discussed and analyzed by means of statistical data of forest from 1985 to 2005 （about 5 years a distance）. The results indi- cate that the areas of the afforested land and forest land have decreased 389.1 × 10^3 hm^2 and 194.9 × 10^3 hm^2, and forest storage has grown 2 031.6 × 10^4 m^3, while the area of non-forest land and forest coverage have decreased 533.9 × 10^3 hm^2 and 8.6% respectively ; and the consumption is smaller than the increment. Moreover, forest resource features and direction towards the development are discussed and evaluated. Forest storage is a little low, but potentiality is high; it shows an uneven distribution, which is rich in the area without middle and southwest area; structure of forest species is reasonable, and forest classification management reform is effective; area ratio of nearly ripe and middle-age and young growth forest is large, and so on. Therewith achieving to find out the cause of dynamic analysis of forest resources scientifically and infer its protection measures in Meizhou.