Pattern and change of soil organic carbon storage in China: 1960s–1980s
Pattern and change of soil organic carbon storage in China: 1960s–1980s
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DOI：
10.3402/tellusb.v55i2.16715
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发表时间：
2003-01
期刊：
影响因子：
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通讯作者：
Shaoqiang Wang;H. Tian;Jiyuan Liu;S. Pan
中科院分区：
文献类型：
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作者：
Shaoqiang Wang;H. Tian;Jiyuan Liu;S. Pan
土壤是全球碳循环的重要组成部分，可以是大气二氧化碳（CO2）的净源或净汇。本文利用第一次和第二次全国土壤普查资料，研究了20世纪60年代至80年代中国土壤有机碳储量的格局和变化。研究结果表明，20世纪80年代不同土壤类型和土地利用方式的土壤有机碳密度存在较大的变异性。西南湿地土壤有机碳密度最高（45 kg m−2），其次是南方的草甸土（26 kg m−2），西北部的森林和林地（19 kg m−2），西北部的草原和草地西北部的灌木（12 kg m-2）、西北部的稻田（13 kg m-2）和西北部的旱地（11 kg m-1）。西部地区的沙漠土壤排名最低（1 kg m-2）。土壤有机碳密度总体上西部高于其他地区。中国东部地区土壤有机碳密度最低，这与该地区长期粗放的土地利用有关。在20世纪60年代，整个国家的SOC储存量估计为93 Pg C，在20世纪80年代为92 Pg C。在20世纪60年代至80年代，SOC储存量减少了约1 Pg C。整个国家SOC的减少量很小，在统计上微不足道。为了充分表征SOC的空间变化，在未来的分析中需要更大的土壤剖面采样尺寸。
Soils, an important component of the global carbon cycle, can be either net sources or net sinks of atmospheric carbon dioxide (CO2). In this study, we use the first and second national soil surveys of China to investigate patterns and changes in soil organic carbon storage (SOC) during the period from the 1960s to the 1980s. Our results show that there is a large amount of variability in SOC density among different soil types and land uses in the 1980s. The SOC density in the wetlands of Southwest China was the highest (45 kg m−2), followed by meadow soils in the South (26 kg m−2), forest and woodlands in the Northwest (19 kg m−2), steppe and grassland in the Northwest (15 kg m−2), shrubs in the Northwest (12 kg m−2), paddy lands in the Northwest (13 kg m−2), and drylands in the Northwest (11 kg m−1). The desert soils of the Western region ranked the lowest (1 kg m−2). The density of SOC was generally higher in the west than other regions. Eastern China had the lowest SOC density, which was associated with a long history of extensive land use in the region. The estimation of SOC storage for the entire nation was 93 Pg C in the 1960s and 92 Pg C in the 1980s. SOC storage decreased about 1 Pg C during the 1960s–1980s. This amount of decrease in SOC for the entire nation is small and statistically insignificant. To adequately characterize spatial variations in SOC, larger sampling sizes of soil profiles will be required in the future analyses.