| 近20年来伊洛河流域典型地区森林景观格局动态 |
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| 引用本文： | 丁圣彦,尚富德,钱乐祥,Cao Xinxiang,LI Shuang,LI Haomin.近20年来伊洛河流域典型地区森林景观格局动态[J].地理学报(英文版),2003,13(2):153-162. |
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| 作者姓名： | 丁圣彦 尚富德 钱乐祥 Cao Xinxiang LI Shuang LI Haomin |
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| 作者单位： | 1. College of Environment & Planning，Henan University，Kaifeng 475001，China; 2. College of Life Science，Henan University，Kaifeng 475001，China |
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| 基金项目： | Prominent Youth Science Foundation of Henan Province，No.0003，No.9920，Natural Science Foundation of Henan Province，No. 0111070100 |
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| 摘 要： | Based on the information from forest resources distribution maps of Luoning County of 1983 and 1999,six indices were used to analyze spatial patterns and dynamics of forest landscapes of the typical region in the middle of the Yihe-Luohe river basin.These indices include patch number,mean patch area,fragment index,patdch extension index,etc,The results showed that;(1) There was a rapid increase in the number of patch and total area from 1983 to 1999 in the study area,The fragment degree became very high.(2) The area of all the forest patch types had witnessed great changes,The fractal degree of each forest patch type became big from 1983 to 1999 ,The mean extension index of Robinia pseudoacacia forest ,non- forest shrub forest ,sparse forest ,and Quercus species forest in creased rapidly,but that of economic forest became zero ,The fractal dimension each showed that forest coverage has been promoted.(3)The changes of landscape patterns were different in different geomprhic regions.From 1983 to 1999 the vegetation cover area,the gross number and the density of patch,diversity and evenness of landscape were all reduced greatly in gullies and ravines,but the maximum area and the mean area of patch types were increased ,In hilly region,both the forest cover area and the number of patch increased from 1983 to 1999,but the mean area of patch was reduced greatly,In mountain region,even though the area under forest canopy reduced from 1983 to 1999 ,the patch number was increased greatly,the mean area of all patch types was reduced ,the extension index,diversity index and evenness index of landscape were all increased.Furthermore,because of different types of land use,human activtiy and terratin ,the vegetation changes on northern and southern mountain slopes were different.According to these analyses,the main driving forces,such as the policies of management,market economy,influence of human activities etc.are brought out.
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| 关 键 词： | 森林 土地 空间分布 管理政策 人类活动 市场经济 |
| 收稿时间： | 21 November 2002 |
| 修稿时间： | 10 March 2003 |
Forest landscape patterns dynamics of Yihe-Luohe river basin |
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| Shengyan,Ding,Fude,Shang,Lexiang,Qian,Xinxiang,Cao,Shuang,Li,Haomin,Li.Forest landscape patterns dynamics of Yihe-Luohe river basin[J].Journal of Geographical Sciences,2003,13(2):153-162. |
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| Authors: | Shengyan Ding Fude Shang Lexiang Qian Xinxiang Cao Shuang Li Haomin Li |
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| Institution: | 1. College of Environment & Planning, Henan University, Kaifeng 475001, China
2. College of Life Science, Henan University, Kaifeng 475001, China |
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| Abstract: | Based on the information from forest resources distribution maps of Luoning County of 1983 and 1999, six indices were used to analyze spatial patterns and dynamics of forest landscapes of the typical region in the middle of the Yihe-Luohe river basin. These indices include patch number, mean patch area, fragment index, patch extension index, etc. The results showed that: (1) There was a rapid increase in the number of patch and total area from 1983 to 1999 in the study area. The fragment degree became very high. (2) The area of all the forest patch types had witnessed great changes. The fractal degree of each forest patch type became big from 1983 to 1999. The mean extension index of Robinia pseudoacacia forest, non-forest, shrub forest, sparse forest, and Quercus species forest increased rapidly, but that of economic forest became zero. The fractal dimension each showed that forest coverage has been promoted. (3) The changes of landscape patterns were different in different geomorphic regions. From 1983 to 1999 the vegetation cover area, the gross number and the density of patch, diversity and evenness of landscape were all reduced greatly in gullies and ravines, but the maximum area and the mean area of patch types were increased. In hilly region, both the forest cover area and the number of patch increased from 1983 to 1999, but the mean area of patch was reduced greatly. In mountain region, even though the area under forest canopy reduced from 1983 to 1999, the patch number was increased greatly, the mean area of all patch types was reduced, the extension index, diversity index and evenness index of landscape were all increased. Furthermore, because of different types of land use, human activity and terrain, the vegetation changes on northern and southern mountain slopes were different. According to these analyses, the main driving forces, such as the policies of management, market economy, influence of human activities etc. are brought out. |
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| Keywords: | forest landscape pattern dynamics geomorphic zone Yihe-Luohe river basin Luoning County CLC number:S718 5 Q948 2 P901 |
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