摘要
陆地生态系统的固碳功能对于全球碳循环具有重要意义,而不同的陆地生态系统的有机碳分布特征又不尽相同。文章以湖北宜城市4种陆地生态系统为研究对象,分析了不同生态系统植被和土壤碳库的有机碳储量和碳密度空间特征,讨论了有机碳分布的影响因素。结果表明:(1)宜城市植被碳密度较低,乔木层碳密度为4.44 t/hm^(2)(以C计,下同),碳储量为2.22×10^(5)t。草灌层在不同陆地生态系统中的有机碳分布各不相同,草灌层在森林生态系统中的有机碳密度为2.88 t/hm^(2),碳储量为1.43×10^(5)t,在草原生态系统中的有机碳密度为7.79 t/hm^(2),碳储量为1.1×10^(4)t,在湿地生态系统中的有机碳密度为20.84 t/hm^(2),碳储量为3.4×10^(4)t。(2)宜城市土壤有机碳的平均含量5.5 g/kg,1 m以上土壤平均密度为66.77 t/hm^(2),有机碳储量为1.13×10^(7)t。0~20 cm的土壤中有机碳含量最高,达到了8.6 g/kg,深度越大,有机碳的含量越低。不同生态系统土壤有机碳的分布特征存在较大差异。草原生态系统的土壤碳密度最大,达到了90.86 t/hm^(2),湿地的土壤碳密度最小,仅为38.91 t/hm^(2);农田生态系统的土壤碳储量最高,总储量为7.87×10^(6)t。从垂直方向上看,土壤有机碳含量总的趋势是呈现出从上到下逐渐降低的趋势,但各个生态系统的规律又不尽相同。(3)从生态系统尺度来看,宜城市有机碳密度草原>森林>农田(不含植被)>湿地,有机碳总储量农田(不含植被)>森林>草原>湿地,生态系统有机碳分布特征受气候、植被、土壤等多重因素相互作用影响。
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/hm^(2),and the carbon storage was 2.22×10^(5)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/hm^(2),the carbon storage was 1.43×10^(5)t in forest ecosystem.While the value in grassland ecosystem was 7.79 t/hm^(2)and 1.1×10^(4)t,as also was 20.84 t/hm^(2)and 3.4×10^(4)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/hm^(2)and the organic carbon storage was 1.13×10^(7)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/hm^(2))in grassland ecosystem,and was only 38.91 t/hm^(2)in wetland ecosystem.The soil carbon storage in farmland ecosystem was the highest storage which was 7.87×10^(6)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 to
作者
张伟
夏锐
曾冠中
汤宇磊
孙康
李猛
康建坤
刘松杭
林治成
ZHANG Wei;XIA Rui;ZENG Guanzhong;TANG Yulei;SUN Kang;LI Meng;KANG Jiankun;LIU Songhang;LIN Zhicheng(Geophysical Survey Center of China Geological Survey,Langfang 065000,China;Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第12期194-203,共10页
Environmental Science & Technology
基金
中国地质调查局项目(DD20208024)。
关键词
生态系统
碳密度
空间分布
ecosystem
carbon density
spatial distribution
