| 基于土地利用变更调查的2010-2016年新疆尉犁县生态系统碳储量时空变化 |
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| 引用本文： | 徐自为,张智杰.基于土地利用变更调查的2010-2016年新疆尉犁县生态系统碳储量时空变化[J].环境科学研究,2018,31(11):1909-1917. |
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| 作者姓名： | 徐自为 张智杰 |
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| 作者单位： | 1.中国土地勘测规划院, 国土资源部土地利用重点实验室, 北京 100035 |
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| 基金项目： | 国土资源部土地利用重点实验室2017年开放基金（No.KLLU201705） |
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| 摘 要： | 为全面认识干旱区不同土地利用类型时空变化对区域生态系统碳储量的影响，以地处塔克拉玛干沙漠边缘生态脆弱区的新疆尉犁县为研究对象，基于详细的土地利用变更调查数据（2010-2016年），利用ArcGIS平台和InVEST模型，分析生态系统碳储量对土地利用变化尤其是二级土地利用类型变化的响应.结果表明:①研究区内，无论是区域平均碳密度还是灌木林地、其他林地、其他草地等主要土地利用类型的碳密度均较低，而面积较少的有林地和天然牧草地碳密度相对较高，因此对这些土地利用类型应着重加强保护.②2010-2016年新疆尉犁县碳存储量净减少24.23×104 t，这主要是由于其他草地、其他园地和果园等土地利用类型被开垦为水浇地，或被建设用地、交通用地占用所导致，而同时研究区内有林地和水浇地面积增加带来了碳储量的提高.③从空间变化看，受不同区域土地利用变化方式的影响，碳储量变化特征也有显著差异，但总体上变化敏感区域集中在塔里木河周边县、乡镇及兵团所在地等人类活动聚集区，这些区域平均碳密度较高，土地利用变化也更为剧烈.④尽管由于开垦行为带来耕地面积增加，从而使得研究区耕地总碳储量增加242.77×104 t，但由于塔里木河沿岸碳密度较高的耕地被建设用地占用，新增耕地多来源于土壤碳储量较低的其他草地等土地利用类型，导致耕地平均碳密度有所下降.研究显示，建设用地占用耕地、林地、草地等地类是尉犁县碳储量减少的重要原因，而林业建设能够带来碳储量增加.因此建议:一方面，推进林、草地建设提高区域生态系统固碳能力；另一方面，重点保护塔里木河周边碳密度较高区域，严控耕地开垦或建设用地占用，同时加强耕地保护，防止通过补充碳密度较低的耕地来弥补碳密度较高区域耕地的流失.
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| 关 键 词： | 碳储量 碳密度 InVEST模型 新疆尉犁 时空变化 |
| 收稿时间： | 2018/2/27 0:00:00 |
| 修稿时间： | 2018/3/22 0:00:00 |
Spatiotemporal Variation of Carbon Storage in Yuli County during 2010-2016 |
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| XU Ziwei and ZHANG Zhijie.Spatiotemporal Variation of Carbon Storage in Yuli County during 2010-2016[J].Research of Environmental Sciences,2018,31(11):1909-1917. |
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| Authors: | XU Ziwei and ZHANG Zhijie |
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| Affiliation: | 1.Key Laboratory of Land Use, the Ministry of Land and Resources, China Land Surveying and Planning Institute, Beijing 100035, China2.State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China |
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| Abstract: | In order to comprehensively understand the impact of land use changes on regional ecosystem carbon storage, this research chose Yuli County as the research area, and analyzed the carbon storage changes using the ArcGIS system and the InVEST model with detailed land use change survey data. The results showed that, firstly, the average carbon density of the investigated area, including the lands of different type uses are lower than other regions. Only the woodland and natural pasture have higher carbon density levels, which should be intensively protected. Secondly, the carbon storage decreased by 24.23×104 t over the past six years, which was because large areas of other grassland and garden land were reclaimed as irrigated land, construction land and transportation land. Thirdly, affected by the land use changes, carbon storage showed different change trends. Generally speaking, the area along the Tarim River showed marked carbon storage changes. Fourthly, as the increase of irrigated land area can improve the carbon storage, the total carbon storage of irrigated land increased with the increase in area. However, the cultivated land with higher carbon density was occupied by construction, and the newly increased cultivated land mostly changed from the category of other grassland, which resulted in a decline in the average carbon density of cultivated land. In conclusion, the occupation of cultivated land, forestland, grassland and other land for construction is an important reason for the reduction in carbon storage. However, the construction of forestland can increase the carbon storage. Based on the above result, it is proposed that we should strengthen the protection of the areas with high carbon density around the Tarim River, and especially prevent the conversion of the cultivated land area to lower carbon density areas for the higher areas. |
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| Keywords: | carbon storage carbon density InVEST model Yuli County spatiotemporal variation |
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