沈阳经济区土地利用变化及净初级生产力变化研究

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 沈阳经济区土地利用和净初级生产力变化 DOI: 10.5846/stxb201406061164 作者: 作者单位: 中国科学院沈阳应用生态研究所,中国科学院沈阳应用生态研究所,中国科学院沈阳应用生态研究所,辽宁省环境科学研究院,中国科学院沈阳应用生态研究所,中国科学院沈阳应用生态研究所,中国科学院沈阳应用生态研究所 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金(41171155);辽宁省生态环境十年(2000-2010年)变化遥感调查与评估课题 Land use and net primary productivity changes in Shenyang Metropolitan Area Author: Affiliation: Institute of Applied Ecology,Chinese Academy of Sciences,Institute of Applied Ecology,Chinese Academy of Sciences,Institute of Applied Ecology,Chinese Academy of Sciences,Liaoning Academy of Environmental Sciences,Institute of Applied Ecology,Chinese Academy of Sciences,Institute of Applied Ecology,Chinese Academy of Sciences,Institute of Applied Ecology,Chinese Academy of Sciences Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:分析了沈阳经济区2000到2010年土地利用变化情况。基于CASA(Carnegie-Ames-Stanford Approach)模型估算2000年、2005年、2010年沈阳经济区净初级生产力(NPP),从行政区划和地类角度分析其时空变化,统计了不同地类转换模式下NPP的损益值,从土地利用变化探讨分析了沈阳经济区土地利用变化带来的NPP变化情况。结果表明:(1)农田,林地和城镇用地为研究区最主要土地利用类型。土地利用最显著变化是城镇用地扩张迅速,农田面积大量减少。林地面积有所减少,草地、湿地、裸地面积变化较小;(2)沈阳经济区NPP呈明显退化趋势,并且时空变化显著,2000到2005年退化幅度大于2005到2010年。除了阜新市有增加,其他市的NPP均为减少;(3)沈阳经济区6种土地利用类型的平均NPP都在下降,降幅最大的是林地。NPP损益分析表明农田转城镇带来的年均NPP损失最大。 Abstract:In recent decades, urban areas in China have been rapidly increasing. This urban area expansion has caused land use changes, which have enormous inuences on regional ecosystems. The potential environmental problems caused by urban expansion have attracted extensive attention from researchers. Net primary productivity (NPP) is the amount of solar energy converted to chemical energy through the process of photosynthesis. NPP loss may affect the composition of the atmosphere, fresh water availability, biodiversity, and the ecological adjusting mechanism of energy supply and distribution. Moreover, NPP is also an important ecosystem productivity indicator. Hence, studying the impact of land use changes, caused by urban expansion, on NPP is crucial to understanding ecosystem structure and function changes. In recent years, Shenyang Metropolitan Area has experienced rapid economic growth and industrial development under the guidance of the central government policy and local government strategy. As a result, urban area expansion of Shenyang Metropolitan Area has also accelerated, resulting in significant land use changes. The 10 years from 2000 to 2010 were representative of the process of Shenyang Metropolitan Area's urban expansion. This study analyzed land use changes with Shenyang Metropolitan Area from 2000 to 2010. Six categories of land use types were interpreted from Landsat TM/ETM remote sensing images: forestland, farmland, urban area, grassland, wetland, and bare land. NPP changes in the study area were estimated through the CASA model. The spatial and temporal dynamics of NPP were studied in regional and land use categorical scales. There is little prior research investigating this change trajectory of NPP under different land-use conversion types. The change of NPP caused by urban expansion of Shenyang Metropolitan Area was analyzed. The results showed: (1) Farmland, forestland, and urban areas were the main land use types within the study area. Rapid urban expansion and loss of farmland were the predominant land use changes. While the area of forestland decreased, grassland, wetland, and bare land area changed only slightly. The demand for land for urban construction was greater in 2005-2010 than the demand in 2000-2005; (2) The NPP of the study area decreased, and changed greatly both in spatial and temporal scales. The NPP decreased more rapidly in 2000-2005 than it did in 2005-2010. The NPP decreased in all of Shenyang Metropolitan Area, except for Fuxin City. The highest values of NPP reduction were in the eastern part of Shenyang Metropolitan Area and the lowest values were located in the northwest region of Shenyang Metropolitan Area; (3) The mean NPP in the six land use types declined. Forestland declined most rapidly and the conversion of farmland to urban area had the largest annual NPP loss. From 2000 to 2005, annual NPP loss from the conversion of farmland to urban area was 21886.68 tons/year. However, from 2005 to 2010, NPP declined to 7003.61 tons/year from the conversion of farmland to urban area. NPP loss was relatively high in the following conversion modes: forestland-farmland, forestland-urban area, and farmland-wetland. However, increases in NPP were observed in the conversions of wetland-grassland, wetland-bare land, and bare land-grassland. 参考文献 相似文献 引证文献