拉萨地区土地利用变化
收稿日期: 2006-03-02
修回日期: 2006-07-10
网络出版日期: 2006-10-25
基金资助
国家自然科学基金项目 (40361001; 90202012); 国家重点基础研究发展计划 (2005CB422006)
Land Use Change in Lhasa Area, Tibet from 1990 to 2000
Received date: 2006-03-02
Revised date: 2006-07-10
Online published: 2006-10-25
Supported by
National Natural Science Foundation of China, No.40361001; No.90202012; National Basic Research Program of China, No.2005CB422006
根据1990年、1995年和2000年3期西藏拉萨地区土地利用现状调查数据,利用GIS空间分析方法,系统地分析了1990年至2000年间拉萨地区的土地利用时空变化特征。得出: ① 10年来拉萨地区的土地利用类型转变主要发生在人类活动比较集中的城镇附近和河谷地区,很多地段的天然植被由人工植被所取代,植被覆盖度和生物产量明显提高,有效地改善了这些区域的土地覆盖状况,这些变化是这一期间实施的农业综合开发中旨在改变区域生态环境的人工植树造林和改良草场等人为有目的地改变土地利用类型的直接结果;② 10年内面积增幅最大的是林地,增加了2.56%;③ 土地利用类型变化最广泛的是牧草地,由牧草地变成耕地、园地、林地、居民点及水域的,其中牧草地变成林地的面积最大,占变化面积的94.09%;④ 耕地变成林地的面积占耕地移出总量的54.86%,变成居民点的占移出面积的38.25%;⑤ 水域变成林地的面积占变化面积的93.13%。
除多,张镱锂,郑度 . 拉萨地区土地利用变化[J]. 地理学报, 2006 , 61(10) : 1075 -1083 . DOI: 10.11821/xb200610007
Based on the results of the first land use survey in Tibet Autonomous Region carried out in the late 1980s, land use map of Lhasa area in 1990 was compiled for the main agricultural area in Lhasa valley using aerial photos obtained in April, May and October 1991 and Landsat imagery in the late 1980s and 1991 as remotely sensed data sources. Using these remotely sensed data, the land use status of Lhasa area in 1991, 1992, 1993, 1995, 1999 and 2000 were mapped through updating annual changes of cultivated land, artificial forest, grass planting, grassland restoration and residential area and so on. According to land use status of Lhasa area in 1990, 1995 and 2000 at five-year intervals, the spatial and temporal land use dynamics in Lhasa area from 1990 to 2000 are further analyzed using GIS spatial models in this paper. The main conclusions are as follows: (1) Land use change in Lhasa area during the period 1990-2000 happened mainly near the major towns and the Lhasa valley. Much natural vegetation was replaced by artificial forests; vegetation coverage and biomass have obviously increased. These changes are directly related to human activities aiming to improve regional environment, such as tree planting, grassland restoration during the implementation of the integrated agricultural development project at that time. (2) The most remarkable increase in area is forest as the forestland increased by 2.556% (2713.48 hm2) from 1990 to 2000. The most comprehensive changes of land use in Lhasa area from 1990 to 2000 is rangeland conversion. Rangeland was converted to cultivated land, horticultural land, forestland, settlement and water body. Among them, the largest area of land use changes is rangeland conversion to forestland (2338.25 hm2), being 94.093% of the area relating to land use change. Some 186.53 hm2 of cultivated land have been converted to forestland over the period 1990-2000, being 54.857% of the total area relating to cultivated land conversion into other land use types. Some water bodies changed into cultivated land, forests and rangeland. Some 243.13 hm2 of water body were converted to forests, being 93.126% of the area relating to land use change, which happened mainly from the bottomland conversion to the artificial forests. (3) Because Lhasa area is a semi-arid and environmentally vulnerable region on the Tibetan Plateau, effective measures should be taken to improve local environment in a short term through bioengineering technologies such as artificial forestation, grassland restoration and so on. These measures can improve local microclimate, conserve water, prevent land desertification and soil and water loss through modifying vegetation cover types and increasing vegetation coverage.
Key words： land use change; Lhasa area; Tibetan Plateau
[1] Lambin E F et al. Land-Use and Land-Cover Change (LUCC), Implementation Strategy. IGBP Report 48, IHDP Report 10, IGBP, IHDP, Stockholm, Bonn, 1999.
[2] Turner II B L et al. Land-Use and Land-Cover Change: Science/Research Plan. IGBP Report No.35; HDP Report No.7, Stockholm and Geneva, 1995.
[3] Li Xiubin. A review of the international researches on land use/land cover change. Acta Geographica Sinica, 1996, 51(6): 553-558.
[李秀彬. 全球环境变化研究的核心领域: 土地利用/土地覆被变化的国际研究动向. 地理学报, 1996, 51(6): 553-558.]
[4] Moran E, Ojima D, Buchmann N et al. Global Land Project (2005) Science Plan and Implementation Strategy. IGBP Report No.53/IHDP Report No.19. IGBP Secretariat, Stockholm. 2005.
[5] Sara Brogaard, Zhao Xueyong. Rural reforms and changes in land management and attitudes: a case study from Inner Mongolia, China. Ambio, 2002, 31(3): 212-218.
[6] Diegues A S. The role of cultural diversity and communal participation management in Brail. Landscape and Urban Planning, 1991, 20(1-3): 61-66.
[7] Benjaminsen Tor A. Fuelwood and desertification: Sahel orthodoxies discussed on the basis of field data from the Gourma region in Mali. Geoforum, 1993, 24(4): 397-409.
[8] Ni Jian. A simulation of biomes on the Tibetan Plateau and their responses to global climate change. Mountain Research and Development, 2000, 20(1): 80-89.
[9] Wang Xiuhong, Fu Xiaofeng. Sustainable management of alpine meadows on the Tibetan Plateau: problems overlooked and suggestions for change. Ambio, 2004, 33(3): 153-154.
[10] Zhao Xinquan, Zhou Xingmin. Ecological basis of alpine meadow ecosystem management in Tibet: Haibei alpine meadow ecosystem research station. Ambio, 1999, 28: 639-641.
[11] Miller D J. Tough times for Tibetan nomads in western China: snowstorms, settling down, fences, and the demise of traditional monadic pastoralism. Nomadic People, 2000, 14: 83-119.
[12] Horlemann B. Modernization efforts in Golog: a chronicle, 1970-2000. In: Toni Huber (ed.), Amdo Tibetans in Transition: Society and Culture in the Post-Mao Era, 2002. 241-267.
[13] Liu Jinxiang, Qu Jianjun, Zhang Weimin. The grassland desertation and control in the mid catchment of Yalu River and its two tributaries of Tibet. Pratacultural Science, 1994, 11(2): 43-47.
[刘金祥, 屈建军, 张伟民. 西藏“一江两河”流域中部草地沙漠化与防治. 草地科学, 1994, 11(2): 43-47.]
[14] Wei Xinghu, Yang Ping, Dong Guangrong. Agricultural development and farmland desertification in middle "One River and Its Two Branches" River Basin of Tibet. Journal of Desert Research, 2004, 24(2): 196-200.
[魏兴琥, 杨萍, 董光荣. 西藏“一江两河”中部地区的农业发展与农田沙漠化. 中国沙漠, 2004, 24(2): 196-200.]
[15] Lan Zhiming, Wang Qingxian. Analysis and appraise of synthesized effect of the exploitation of "One River and Its Two Branches" River Basin of Tibet in the Eighth Five Year Plan period. Chinese Tibet Study, 2000, 11: 11-25.
[兰志明, 王清先. "八五"时期西藏"一江两河"综合开发效益分析与评价. 中国藏学, 2000, 11: 11-25.]
[16] Chu Yushan, Liu Jiyuan. Land Use of Tibet Autonomous Region. Beijing: Science Press, 1992.
[楚玉山, 刘纪远. 西藏自治区土地利用. 北京: 科学出版社, 1992.]
[17] Lhasa City Bureau of Agriculture and Stock Raising. Land Resources of Lhasa. Beijing: China Agricultural Science and Technology Press, 1993.
[西藏自治区拉萨市农牧局. 西藏拉萨土地资源. 北京: 中国农业科技出版社, 1993.]
[18] Liu Yanhua. Land System in Mid-Reach Area of Yalu Zangbo River in Tibet. Beijing: Science Press, 1992.
[刘燕华. 西藏雅鲁藏布江中游地区土地系统. 北京: 科学出版社, 1992.]
[19] Zhang Zengxiang, Chu Duo et al. Integrated Assessment and Dynamic Monitoring of Natural Resources and Environment of Central Tibet by Remote Sensing. Beijing: Yuhang Press, 1998.
[张增祥, 除多 等. 西藏自治区中部地区资源环境遥感监测与综合评价研究. 北京: 宇航出版社, 1998.]
[20] Zhang Yili, Li Xiubin, Fu Xiaofeng et al. Urban land use change in Lhasa. Acta Geographica Sinica, 2000, 55(4): 395-406.
[张镱锂, 李秀彬, 傅小锋 等. 拉萨城市用地变化分析. 地理学报, 2000, 55(4): 395-406.]
[21] Zhang Yili, Zheng Du et al. Regional ecosystem and environment change on the Plateau. In: Zheng Du, Yao Tandong et al., Uplifting of Tibetan Plateau with Its Environmental Effects. Beijing: Science Press, 2004. 459-554.
[张镱锂, 郑度 等. 青藏高原区域生态环境变化及其管理对策探讨. 见: 郑度, 姚檀栋 等著, 青藏高原隆生与环境效应. 北京: 科学出版社, 2004. 459-554.]
[22] Chu Duo, Zhang Yili, Zheng Du. Landuse change scenario in Lhasa district using Markov chain model. Geographical Research, 2005, 24(6): 869-877.
[除多, 张镱锂, 郑度. 拉萨地区未来土地利用变化情景分析. 地理研究, 2005, 24(6): 869-877.]
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