广东省森林资源动态变化及成因分析

Dynamic change in forest resources and drives in Guangdong province

在1983年到2005年的林地基本数据的基础上,文章利用统计分析方法、单一土地利用类型动态度、土地利用变化区域差异模型分析方法结合GIS对广东省森林资源进行了分析,主要分析了森林资源的时间变化,包括数量的动态变化、变化速度以及区域变化差异,总结出广东省森林资源动态变化的几个特点:①林业用地1987年最少,有林地持续稳定增长,先由无林地和疏林地大面积减少转化为有林地,后来主要是非林业用地转化为林业用地。防护林面积有大幅度上升,薪炭林呈下降趋势。②幼龄林占绝对比重,近过成熟林比重低但在逐渐增加。活立木总蓄积持续上升,幼龄林、中龄林和近成过熟林蓄积基本随着面积变化而变化。③灌木林地和未成林造林地有相当幅度面积的增加。④1996—2004年,广州、深圳、珠海、东莞、中山、佛山林地相对变化率大多数在10以上,比平均变化大得多。文中对成因有简单的探讨,明确了广东省森林资源变化特点和规律,这将为广东省森林资源的可持续发展和决策部门提供依据。

According to forest data collected in 1983,1987, 1992, 1996, 2000 and 2005 of Guangdong Province, this paper provides detailed information about the dynamic changes of forest resources and concisely explains the factors arousing these changes. It mainly analyzed the change of forest on quantity, speed and district difference. We found the variety characteristics and regulation of forest resources in Guangdong province, forested land is increasing all the while. From 1992, area of shelter forests rises in great extent, firewood forests declines and forests for specific use changes little. Young-aged forest accounts for considerable proportion, the proportion of mature-aged forests is rising, but it is always small. The volume of forest resource goes up persistently, and volumes of Young-aged, middle-aged and mature-aged forest changes along with areas. From 1996 to 2004, the relative variety rates of Guangzhou, Shenzhen, Zhuhai, Dongguan, Zhongshan and Foshan are greatly bigger than the average. The diagrams of forest distributing in the region of Pearl River Delta and Zhanjiang region have changed greatly. Combining other social and economic data, paper analyzes the driving forces of forest change. And this can provide some basis of forest resources development for related section.