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岷江上游地区人类活动强度及其特征

胡志斌;何兴元;李月辉;朱教君;李小玉   

  1. 中国科学院沈阳应用生态研究所, 沈阳 110016
  • 收稿日期:2006-07-24 修回日期:1900-01-01 出版日期:2007-04-03 发布日期:2007-04-03

Human activity intensity and its spatial distribution pattern in upper reach of Minjiang River

HU Zhi-bin; HE Xing-yuan; LI Yue-hui; ZHU Jiao-jun; LI Xiao-yu   

  1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2006-07-24 Revised:1900-01-01 Online:2007-04-03 Published:2007-04-03

摘要: 利用1∶25万国家基础地理信息数据,在ArcGIS支持下,基于地理学自相关理论, 采用居民点、道路和地形因子等权重指标,实现岷江上游人类活动强度定量化的空间表达,并分析其空间特征。结果表明:岷江流域各个县域人类活动强度大小和分布均有差异,其中黑水县人类活动最为剧烈,且分布最为均匀;理县和茂县人类活动强度和分布均匀程度基本接近全流域的平均水平;靠近成都平原的汶川县,因卧龙保护区位于该区境内,使该县的人类强度降低,同时其人类活动的空间分布亦不均匀;松潘县地处北部,人类活动强度最低。本研究采用坡度、道路和居民点3个因子来定量化人类活动强度,反映了研究区人类活动强度及其空间分布特征,从而为进一步探讨景观格局演变提供了新的思路。

关键词: 七子花, 天然种群, 遗传多样性, 遗传分化, RAPD

Abstract: Based on the self-correlation theory in geography and the National GIS database (1∶250000), the human activity intensity (HAI) and its spatial characteristics in the upper reach of Minjiang River were quantified and spatialized by calculating the weighted factors of roads, settlements and terrain. The results showed that the size and distribution pattern of HAI varied with the counties in the study area. In Heishui County, HAI was the strongest and had the most uniform distribution; in Lixian and Maoxian Counties, both the size and the distribution of HAI were close to the average; in Wenchuan County near Chengdu Plain, the HAI was rather low and distributed unevenly because of its covering Wolong Giant Panda Natural Reserve; while in Songpan County, it was low in HAI due to the low density of roads and settlements. It was a realistic and efficient way to delineate and analysis the HAI by gaining and integrating the factors of roads, settlements and terrain, which would benefit the further research of landscape pattern change.

Key words: Hepatacodium miconioides, Natural population, Genetic diversity, Genetic differentiation, RAPD