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- Title
湖北宜城陆地生态系统碳储量特征及影响因素.
- Authors
张伟; 夏锐; 曾冠中; 汤宇磊; 孙康; 李猛; 康建坤; 刘松杭; 林治成
- Abstract
The carbon sequestration function of terrestrial ecosystems is of great importance to the global carbon cycle. But there are some different distribution characteristics of organic carbon in each terrestrial ecosystem. Therefore, in this paper, four terrestrial ecosystems were used as research objects to analyze the spatial characteristics of organic carbon storage and carbon density in vegetation carbon pools and soil carbon pools of different ecosystems, and the influencing factors of organic carbon distribution were discussed. Results showed that the total vegetation carbon density in Yicheng was low. The carbon density was 4.44 t/hm², and the carbon storage was 2.22×105 t in the arbor layer. The organic carbon distribution of grassshrub layer was different in each terrestrial ecosystem. As the results, the organic carbon density was 2.88 t/hm², the carbon storage was 1.43×105 t in forest ecosystem. While the value in grassland ecosystem was 7.79 t/hm² and 1.1×104 t, as also was 20.84 t/hm² and 3.4×104 t in wetland ecosystem. The average content of soil organic carbon was 5.5 g/kg. Making a comparison between the part of soil that over 1m and in 0~20 cm, the average density was 66.77 t/hm² and the organic carbon storage was 1.13×107 t about the former, that had the highest content up to 8.6 g/kg about the latter. It was concluded that the deeper the depth, the lower the organic carbon content. The distribution characteristics of soil organic carbon in different ecosystems had huge dissimilarities. According to the soil carbon density, it had the high point (90.86 t/hm²) in grassland ecosystem, and was only 38.91 t/hm² in wetland ecosystem. The soil carbon storage in farmland ecosystem was the highest storage which was 7.87×106 t. In vertical direction, the total content of soil organic carbon showed a decreasing trend from surface to the deep, but the pattern of each ecosystem was different. On an ecosystem scale, the organic carbon density was grassland>forest>farmland (without vegetation) >wetland, and the total organic carbon storage was farmland(without vegetation)>forest>grassland>wetland. The distribution of organic carbon was affected by the interaction of climate, vegetation, soil and etc.
- Subjects
CARBON in soils; SOIL density; CARBON sequestration; ECOSYSTEMS; GRASSLAND soils; CARBON cycle; CARBON; WETLANDS
- Publication
Environmental Science & Technology (10036504), 2022, Vol 45, Issue 12, p194
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.1100.22.338