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Monitoring the Cultivated Slope land in the Three Gorges Reservoir Area Based on Remote Sensing and GIS

Wuhan University Journal of Natural Sciences 2006年第4期11卷 915-921页

作者： ZHOU Jieming1, ZHOU Qigang 2, 3 ,HUANG Zhiqin 2, 3, 4.1. The Faculty of Geography and resources Science, sichuan Normal University, chengdu 610066, sichuan,{4. 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, chengdu 61004., sichuan,{4. 3. Graduate University of the Chinese Academy of Sciences, Beijing 10004.,{4. 4. information center of land and resources department of sichuan province, chengdu 61004., sichuan,{4. The Faculty of Geography and resources Science Sichuan Normal University Chengdu Sichuan China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu Sichuan China Graduate University of the Chinese Academy of Sciences Beijing China information center of land and resources {4. of sichuan province Chengdu Sichuan China

By means of combining auto-extraction with manual interpretation, the current distribution information about cultivated land is obtained. The distribution information of 1992 is extracted from the dynamic polygons of 2002. The monitoring mini-system of the cultivated slope land is established. In the system, detailed surveys, focused on the {4. of cultivated slope land, are carried out. The results indicate that the area of the cultivated slope land is very large. Meanwhile, there are lots of cultivated steep slopes with gradient above 35°. The areas of steep land cultivated had been slowly reduced from 1992 to 2002. At the same time, the pressures of returning farm land to forestry are great in all counties. The conflicts between population growth, insufficient grain supply and stagnant economic development sharpen increasingly. It is inevitable to improve the agricultural structure.

关键词： slope land cultivated remote sensing geography information system (GIS) the pressure of returning farm land to forestry Three Gorges Reservoir Area

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A family net of giant pandas in the Tangjiahe Natural Reserve:Assessment of current individual migration

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Science Bulletin 2005年第17期 65-72页

作者： WAN Qiuhong1, FANG Shengguo1, LI Jianguo2, ZHANG Liming 3, OU Weifu4. XIAN Fanghai4.& CHEN Wanli4.1. College of Life Sciences, State Conservation center for Gene Re-sources of Endangered Wildlife, and Key Laboratory of Conservation Genetics and Reproductive Biology for Endangered Wild Animals of Ministry of Education, Zhejiang University, Hangzhou 310029, china 2. Forestry department of sichuan {4., chengdu 610081, china 3. sichuan Bureau for Wildlife Resource Investigation, Conservation and Management, chengdu 610082, china 4. Tangjiahe Natural Reserve, Qingchuan 628109, china

In the present study, formalin-fixed feces, oli-gonucleotide fingerprinting and SRY-gene based sexing were used to construct a family net for giant pandas in the Tang-jiahe Natural Reserve and to assess contemporary gene flow (migration) in this population. A total of 124.fecal samples were attributed to 37 individuals (22 females and 15 males) that were then analyzed for family relationships. Based on DNA fingerprints, the deduced family net revealed the fol-lowing facts: (i) First-order relatives possessed similarities from 50% to 90%, and similarities between unrelated indi-viduals or distant relatives were as high as 77%, indicating that the Tangjiahe pandas are characterized by high genetic similarity; (ii) 15 matings were identified and 5 ones oc-curred between close relatives, implying that there is poten-tial for inbreeding to impact the pandas; (iii) four mating pairs and 5 offspring presented long distance migrations, demonstrating the intra-reserve habitat is continuous; (iv) four pairs of full sibs (also female-male dyads) dispersed short distance and all of them gave birth to highly inbred offspring, reflecting long distance migration is vital for in-breeding avoidance; (v) 17 adult individuals dispersed short or moderate distance and formed three clusters on the land-scape, indicating that it is necessary to find out whether there is a negative factor impacting the pandas.

关键词： multilocus DNA fingerprinting giant panda family rela-tionship close inbreeding dispersal pattern.

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