Carbon storage and spatial distribution patterns of paddy soils in China |
| |
| Authors: | Hongjie Wang Qinghua Liu Xuezheng Shi Dongsheng Yu Yongcun Zhao Weixia Sun Jeremy Landon Darilek |
| |
| Institution: | (1) State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China;(2) College of Resource and Environment, Laiyang Agricultural College, Qingdao, 200109, China;(3) The Graduate School, Chinese Academy of Sciences, Beijing, 100039, China |
| |
| Abstract: | Carbon storage in agricultural soils plays a key role in terrestrial ecosystem carbon cycles. Paddy soil is one of the major
cultivated soil types in China and is of critical significance in studies on soil carbon sequestration. This paper estimated
the organic and inorganic carbon density and storage in paddy soils, and analyzed the paddy soil stock spatial distribution
patterns in China based on subgroups and regions using the newly compiled 1:1 000 000 digital soil map of China as well as
data from 1 490 paddy soil profiles. Results showed that paddy soils in China cover an area of about 45.69 Mhm2, accounting for 4.92% of total soil area in China. Soil organic and inorganic carbon densities of paddy soils in China showed
a great heterogeneity. Paddy soil organic carbon densities (SOCD) in soil profile ranged from 0.53 to 446.2 kg/m2 (0 to 100 cm) while the paddy soil inorganic carbon densities (SICD) ranged from 0.05 to 90.03 kg/m2. Soil organic carbon densities of paddy soils in surface layer ranged from 0.17 to 55.38 kg/m2 (0 to 20 cm), with SICD of paddy soils ranging from 0.01 to 21.85 kg/m2. Profile based and surface layer based paddy soil carbon storages (SCS) are 5.39 Pg and 1.79 Pg, respectively. Paddy soil
organic carbon storage (SOCS) accounts for 95% of the total carbon storage. Profile based and surface layer based SOCS of
paddy soils are 5.09 Pg and 1.72 Pg, respectively. Soil inorganic carbon storage (SICS) of paddy soils accounts for 5% of
the total carbon storage in China. Profile based and surface layer based paddy SICS are 0.30 Pg and 0.07 Pg respectively.
Among all the eight paddy soil subgroups, hydromorphic, submergenic and percogenic paddy soils account for 85.2% of the total
paddy soil areas all over China. Consequently, profile based carbon storages of these three subgroups account for 78.1% of
the total profile based paddy SCS in China. Most paddy soils in China are distributed in the East-China, South-China and South-west
China regions, therefore, 92.6% of China’s profile based paddy SCS focuses on these three regions. The estimates of soil carbon
stocks in paddy soils will help to identify areas or soil subgroups which are of particular interest for soil carbon gains
and losses.
Translated from Ecology and Environment, 2006, 15(4): 659–664 译自: 生态环境] |
| |
| Keywords: | organic carbon inorganic carbon carbon storage distribution pattern paddy soils |
| 本文献已被 万方数据 SpringerLink 等数据库收录！ |
|
