水土资源是人类赖以生存的重要的物质基础,水土保持作为人类对生态系统干预的有效手段,其生态服务功能价值也受到越来越多的重视。论文选取土壤保持价值和涵养水源价值两项指标,结合遥感数据、气象数据以及地面数据,对原有的基于遥感的水土保持生态服务功能价值估算模型进行改进,以期更好地体现水土保持生态服务功能应有的价值。论文运用改进后的模型估算2001年全国水土保持生态服务功能价值达16 760.55×108元,基本呈自东南向西北递减趋势。
Soil and water resources are important material basis for human life. As an effective means of human intervention, the value of soil and water conservation ecosystem services has been given more and more attention. In this paper, the value of conserving soil and fertilizer and the value of conserving water were selected as the indices of the value of conserving soil and water. Integration of remote sensing data, meteorological data and ground data, the original soil and water conservation service evaluation model is improved. The value of conserving soil includes three types, i.e. conserving soil fertilization, reducing surface soil loss and alleviating sedimentation. As the key point of estimating the value of conserving soil, in this paper, the USLE model was improved to estimate the quantity of soil conservation. The value of conserving water was estimated by the method of shadow engineering through expanse of building reservoir with the same water storage. Utilizing RS and GIS technique, quick estimation can be achieved through IDL programme. There are some uncertainties existing in this estimation. Firstly, the basic data are not completely consistent with the actual land surface. Secondly, some experience models adopted are difficult to reveal the soil erosion physical process.Result shows the value of conserving water and soil of ecosystem in China was 16760.55 billion yuan in 2001, including 9663.50 billion yuan of conserving soil and 7096.55 billion yuan of conserving water. According to spatial distribution, it descended from south to north. According to land cover, evergreen broadleaf trees were the highest of average value, water body less, barren and ice the lowest. According to terrain, with the higher altitude, the value of conserving soil and water showed a downward trend. According to administrative, Guangdong was the highest of average value, Xinjiang the lowest, and provinces in eastern and southern parts of China were higher than others. It is difficult to get the measured data to verify the estimation result and has no comparability to the related research, based on different methods and different indices. In the future research, the verification needs to be strengthened.
[1] 欧阳志云, 王效科, 苗鸿. 中国陆地生态系统服务及其生态经济价值的初步研究[J]. 生态学报, 1999, 19(5): 607-613.
[2] Robert Costanza, Ralph d’Arge, Rudolf de Groot, et al. The value of the world’s ecosystem services and natural capital [J]. Nature, 1997, 387: 253-260.
[3] 吴岚. 水土保持生态服务功能及其价值研究. 北京: 北京林业大学, 2007.
[4] 余新晓, 吴岚, 饶良懿, 等. 水土保持生态服务功能价值估算[J]. 中国水土科学, 2008, 6(1): 83-86.
[5] 于德永, 潘耀忠, 龙中华, 等. 基于遥感技术的云南省生态系统水土保持价值测量[J]. 水土保持学报, 2006, 20(2): 174-178.
[6] 李晶, 任志远. 基于GIS的陕北黄土高原土地生态系统水土保持价值评价[J]. 中国农业科学, 2007, 40(12): 2796-2803.
[7] 林年丰, 孙平安, 汤洁, 等. 松嫩平原水土保持价值的量化研究[J]. 水土保持学报, 2006, 20(1): 155-159.
[8] 李金昌, 姜文来, 靳乐山. 生态价值论[M]. 重庆: 重庆大学出版社, 1999.
[9] 《中国生物多样性国情研究报告》编写组. 中国生物多样性国情研究报告[M]. 北京: 中国环境科学出版社, 1998: 19-21.
[10] 赵同谦. 中国陆地生态系统服务功能及其价值评价研究. 北京: 中国科学院生态环境研究中心, 2004.
[11] Wischmeier W H, Smith D D. A universal soil loss estimating equation to guiding conservation farm planning //Transaction of 7th International Congress of Soil Science, 1960: 418-425.
[12] Williams J R R. EPIC: A new method for assessing erosion’s effect on soil productivity [J]. Journal of Soil and Water Conservation, 1983, 38: 381-383.
[13] Wischmeier W H, Smith D D. Predicting Rainfall Erosion Losses—A Guide to Conservation Planning with the Universal Soil Loss Equation [M]. Agriculture Handbook No. 537 United States Department of Agriculture, Springfield, USA, 1978.
[14] Burrough P A. Principles of Geographical Information Systems for Land Resources Assessment [M]. New York: Oxford University Press, 1986.
[15] Kirkby M J, Morgan R P C. Soil Erosion [M]. Irrigation Works and Electric Power Publishing Company, 1987.
