Soil inorganic carbon storage pattern in China
Soil inorganic carbon storage pattern in China
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DOI：
10.1111/j.1365-2486.2008.01642.x
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发表时间：
2008-10-01
影响因子：
11.6
通讯作者：
Jobbagy, Esteban
中科院分区：
文献类型：
--
作者：
Mi, Na;Wang, Shaoqiang;Jobbagy, Esteban
中国约有30%（3.44 × 10（6）km（2））的土壤覆盖着成土碳酸盐，主要分布在西北部的干旱和半干旱地区。根据1979-1992年全国第二次土壤普查资料，估算了中国土壤无机碳储量为53.3 ± 6.3PgC（1 Pg=10（15）g），调查深度为2 m。0-0.1、0.1-0.3、0.3-0.5和0.5-1 m深度范围的土壤无机碳储量分别为4.6、10.6、11.1和20.8 Pg。0.1、0.3、0.5和1 m深度的种群分别占总SIC的8.7%、28.7%、49.6%和88.9%。与土壤有机碳（SOC）储量在平均降水量500-800 mm yr（-1）时最高相反，SIC储量在平均降水量< 400 mm yr（-1）时达到峰值。SIC的数量和垂直分布与气候和土地覆盖类型有关。SIC含量与年平均气温呈正相关，与年平均降水量呈负相关，不同土地覆被类型SIC含量大小顺序为：荒漠、草地>灌丛、农田>沼泽、森林、草甸。SIC的密度增加一般与深度在所有的生态系统类型的沙漠和沼泽，它在中间层达到峰值（0.1-0.3米的第一和0.3-0.5米的第二）。SIC是中国土壤碳储量的重要组成部分，其动态变化及其在土壤中的积累和损失过程需要进一步研究。
Soils with pedogenic carbonate cover about 30% (3.44 x 10(6) km(2)) of China, mainly across its arid and semiarid regions in the Northwest. Based on the second national soil survey (1979-1992), total soil inorganic carbon (SIC) storage in China was estimated to be 53.3 +/- 6.3 PgC (1 Pg=10(15) g) to the depth investigated to 2 m. Soil inorganic carbon storages were 4.6, 10.6, 11.1, and 20.8 Pg for the depth ranges of 0-0.1, 0.1-0.3, 0.3-0.5, and 0.5-1 m, respectively. Stocks for 0.1, 0.3, 0.5, and 1 m of depth accounted for 8.7%, 28.7%, 49.6%, and 88.9% of total SIC, respectively. In contrast with soil organic carbon (SOC) storage, which is highest under 500-800 mm yr(-1) of mean precipitation, SIC storage peaks where mean precipitation is < 400 mm yr(-1). The amount and vertical distribution of SIC was related to climate and land cover type. Content of SIC in each incremental horizon was positively related with mean annual temperature and negatively related with mean annual precipitation, with the magnitude of SIC content across land cover types showing the following order: desert, grassland > shrubland, cropland > marsh, forest, meadow. Densities of SIC increased generally with depth in all ecosystem types with the exception of deserts and marshes where it peaked in intermediate layers (0.1-0.3 m for first and 0.3-0.5 m for latter). Being an abundant component of soil carbon stocks in China, SIC dynamics and the process involved in its accumulation or loss from soils require a better understanding.