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Coastal Saline-alkali Land Use Change and Its Optimization:A Case Study on the 'Raised Field -Shallow Pond' Pattern in Huanghua County

YUE Yaojie1,2,3,ZHANG Feng1,3,ZHANG Guoming3,ZHANG Hua1,2, XU Pinhong1,2,WANG Jing'ai1,2,3 (1. School of Geography, Beijing Normal University, Beijing 100875,China; 2. Key Laboratory of Regional Geography, Beijing Normal University, Beijing 100875,China; 3. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875,China)  
Integrated research on Land use change and its optimization is an important issue in the fields of land science and sustainable development. China's coastal saline land could be important reserved land resources in the future. To this end, investigation of coastal saline land change and its optimization would be greatly helpful for mitigation of human-land contradictions and the improvement of ecological environment as well as sustainable development. In the present paper, first, the necessity and importance on coastal saline land use change and its optimization were analyzed in detail. A coastal saline land classification criterion was then proposed based on varying salinity degrees the soil suffers from. Finally, related ideal and actual measures needed to be taken for land use optimization were put forward in terms of regional salinity levels and salt contents of topsoil. The optimized land use model termed the 'raised field-shallow pond' pattern for saline-alkali land in coastal zones was presented. Field observations showed that the pattern can significantly reduce the salt content in soil where a stable and suitable arable layer environment is provided for crop growth. Based on GIS and remote sensing techniques, the land use change of Huanghua County was successfully detected and land use optimization scenarios were simulated with the 'raised field-shallow pond' pattern. Results indicated that the land use pattern changed dramatically from 1986 to 2006, showing an 14.31% increase in arable land and a 93.95% increase in construction land, whereas unused land reduced by 23.07%. It was estimated that arable land converted from the saline-alkali soil increased 35.8×103hm2, which was 3.5 times of total increases in arable land during this period. In addition, it was suggested that the saline-alkali land reclamation was basically a major form of increases in arable land in Huanghua County. The soil salt content in Huanghua County exhibited belt and patch spatial distributions, generally decreasing from the northeast to the southwest. It was also shown that the soil salinity in the east was higher than that in the west. The nearer to the shore, the higher soil salt content was observed, vice versa. In the year 2006, the non-saline-alkali land, the saline lands categorized as the mild, moderate and severe salinity levels were found to be 54.67%, 27.01%, 12.55% and 5.77%, respectively, for which the saline lands of mild and moderate degrees accounted for 40% of the total saline-alkali land area. After the implementation of the 'raised field-shallow pond' pattern in Huanghua County, its arable land area decreased to 28.7% and wetlands and saline grasslands increased to 38.62%, which could be indicative of achieving ecological safety and maintaining relatively high production efficiency as well.
【Fund】: 国家高技术研究发展计划(863计划)项目:“海冰资源淡化与利用技术”(编号:2006AA100206)
【CateGory Index】: S156.4;F301
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