The largest ecological restoration project in the form of Sloping Land Conversion Program (SLCP) been implemented for about ten years in China since 1999. Nationwide research on Sloping Land Conversion (SLC) policy needs to examine especially at the beginning of 21st century, because the project has been implemented on unprecedented scale in this period. This study tried to monitor the spatial pattern of ecological SLC using land use change dataset from human-aided interpretation of Landsat TM images. Quantity and spatial pattern of SLC (2000-2005) including two types of conversion, namely “converting cultivated land into forest” and “converting cultivated land into grassland” was analyzed. A case study of Middle and Northern Shaanxi Province, which is one of the most typical region of Loess Plateau, was investigated to analyze the rationality of the project implementation based upon the two types of conversion. The model of habitat suitability for cropping was used for the rationality evaluation of SLCP. The results showed that: (1) SLCP was concentrated mainly in the central regions of China, especially in the middle reaches of Yangtze River and Yellow River, and SLC covered nearly a half of the total cropland loss; the soil erosion zone of Loess Plateau had a large area of sloping lands which was estimated about 1162.50 km2, and more than half of them for forestation; (2) the spatial location of the projects was rational on the whole, and the cropland with lower suitability levels had a higher area proportion convered. The proportion of sloping lands conversion in marginal suitability level was the largest and covered 77.35 % of all the SLCP area, of which 603.32 km2 was converted into forest lands and 528.94 km2 of that into grasslands. There was more croplands converted into forest than into grassland. The converted cropland area with moderate suitability still had a percentage of 19.38, and the possible reason was due to the management factor and target allocation of SLCP. Furthermore, local farmers set aside cropland, and then worked in cities for more subsides. There was still a large areas of cropland unsuitable and marginally suitable, which should be considered to be converted first of all in the future.
DONG Jinwei, LIU Jiyuan, SHI Wenjiao
. China’s Sloping Land Conversion Program at the Beginning of
21st Century and Its Habitat Suitability in Typical
Region of Loess Plateau[J]. Journal of Resources and Ecology, 2010
, 1(1)
: 36
-44
.
DOI: 10.3969/j.issn.1674-764x.2010.01.005
Burgman M A, D R Breininger, B W Duncan, S Ferson. 2001. Setting reliability bounds on habitat suitability indices. Ecological Applications, 11:70–78.
Cengiz T, C Akbulak. 2009. Application of analytical hierarchy process and geographic information systems in land-use suitability evaluation: a case study of Dumrek village (Canakkale, Turkey). International Journal of Sustainable Development and World Ecology, 16:286–294.
Fu B J, Meng Q H, Qiu Y, Zhao W W, Zhang Q J, D A Davidson. 2004. Effects of land use on soil erosion and nitrogen loss in the hilly area of the Loess Plateau, China. Land Degradation & Development, 15:87–96.
Fu Q, Zhao X, Le L, Guo X. 2009. Evaluation on multi-suitability of cultivated land based on GIS and niche-fitness model. Transactions of the CSAE, 25:208–213.
Hirzel A H, G Le Lay. 2008. Habitat suitability modelling and niche theory. Journal of Applied Ecology, 45:1372–1381. DOI: 10.1111/j.1365-2664.2008.01524.x.
Littleboy M, D M Smith, M J Bryant. 1996. Simulation modelling to determine suitability of agricultural land. Ecological Modelling, 86:219–225.
Liu J Y, Zhang Z X, Xu X L, Kuang W. 2009. Analysis of spatial pattern of land use change and its driving force in China in the early of 21st century. Acta Geographica Sinica, 64(12):1411–1420. (in Chinese)
Liu J Y, Liu M L, Zhuang D F, Zhang Z X, Deng X Z. 2003. Study on spatial pattern of land-use change in China during 1995–2000. Science in China Series D-Earth Sciences, 46:373–384.
Liu J Y, Liu M L, Tian H Q, Zhuang D F, Zhang Z X, Zhang W, Tang X M, Deng X Z. 2005. Spatial and temporal patterns of China’s cropland during 1990-2000: An analysis based on Landsat TM data. Remote Sensing of Environment, 98:442-456. DOI: 10.1016/j.rse.2005.08.012.
Martinez-Casasnovas J A, A Klaasse, J Nogues, M C Ramos. 2008. Comparison between land suitability and actual crop distribution in an irrigation district of the Ebro valley (Spain). Spanish Journal of Agricultural Research, 6:700–713.
Murgante B, G Las Casas. 2004. GIS and fuzzy sets for the land suitability analysis. Computational Science and Its Applications - ICCSA 2004, PT2 3044:1036-1045. DOI: 10.1007/b98051.
Office N.S.S. 1996. The soil content maps of organic matter, total nitrogen, total phosphorus and total potassium with the scale of 1:4, 000, 000. Xi’an: Xi’an Cartographic Publishing House. (in Chinese)
Peng H, Cheng G, Xu Z, Yin Y, Xu W. 2007. Social, economic, and ecological impacts of the ‘Grain for Green’ project in China: A preliminary case in Zhangye, Northwest China. Journal of Environmental Management, 85:774–784.
Qin J, Chen C. 2005. The historical development and evolution stages of China’s Grain for Green Project. Journal of Agrotechnical Economics, (1):58–63.
Reshmidevi T V, T I Eldho, R Jana. 2009. A GIS-integrated fuzzy rule-based inference system for land suitability evaluation in agricultural watersheds. Agricultural Systems, 101:101–109.
Sun D F, Li H, R Dawson, Tang C J, Li X W. 2006. Characteristics of steep cultivated land and the impact of the Grain-for-Green Policy in China. Pedosphere, 16:215–223.
Tao F, Yokozawa M, Liu J Y, Zhang Z. 2009. Climate change, land use change, and China’s food security in the twenty-first century: an integrated perspective. Climatic Change, 93:433-445. DOI: DOI 10.1007/s10584-008-9491-0.
Tseganeh B, P S Sehra, A Sood. 2008. Land suitability analysis for agricultural crops using GIS and remote sensing techniques. Journal of Agrometeorology, 10:67–71.
Wang X. 2007. Application of ecological niche suitability evaluation model to decision-making for converting cultivated land into forests. Transactions of the Chinese Society of Agricultural Engineering, 23:113–116. (in Chinese)
Wang X H, Lu C H, Fang J F, Shen Y C. 2007. Implications for development of grain-for-green policy based on cropland suitability evaluation in desertification-affected north China. Land Use Policy, 24:417-424. DOI: DOI 10.1016/j.landusepol.2006.05.005.
Xu Z G, Xu J T, Deng X Z, Huang J K, E Uchida, S Rozelle. 2006. Grain for green versus grain: Conflict between food security and conservation set-aside in China. World Development, 34:130-148. DOI: DOI 10.1016/j.worlddev.2005.08.002.
Ye Y Q, Chen G J, Hong F. 2003. Impacts of the ‘Grain for Green’ project on rural communities in the Upper Min River Basin, Sichuan, China. Mountain Research and Development, 23:345–352.
Yu B H, Lu C H. 2006. Change of cultivated land and its implications on food security in China. Chinese Geographical Science, 16:299–305.
Zhou H J, A Van Rompaey, Wang J A. 2009a. Detecting the impact of the ‘Grain for Green’ program on the mean annual vegetation cover in the Shaanxi Province, China using SPOT-VGT NDVI data. Land Use Policy, 26:954-960. DOI: DOI 10.1016/j.landusepol.2008.11.006.
Zhou Z C, Gan Z T, Shangguan Z P, Dong Z B. 2009b. China’s Grain for Green Program has reduced soil erosion in the upper reaches of the Yangtze River and the middle reaches of the Yellow River. International Journal of Sustainable Development and World Ecology, 16:234–239.
