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Effects of land use and cultivation time on soil organic and inorganic carbon storage in deep soils

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Yu Xia 1,2,3   Zhou Weijian 1,2,4,5 *   Wang Yunqiang 1,4,5,6   Cheng Peng 1,2,7,8   Hou Yaoyao 1,2   Xiong Xiaohu 1,2   Du Hua 1,2   Yang Ling 1,2,3   Wang Ya 1,2,3  
文摘 The vertical distribution and exchange mechanisms of soil organic and inorganic carbon (SOC, SIC) play an important role in assessing carbon (C) cycling and budgets. However, the impact of land use through time for deep soil C (below 100 cm) is not well known. To investigate deep C storage under different land uses and evaluate how it changes with time, we collected soil samples to a depth of 500 cm in a soil profile in the Gutun watershed on the Chinese Loess Plateau (CLP); and determined SOC, SIC, and bulk density. The magnitude of SOC stocks in the 0-500 cm depth range fell into the following ranking: shrubland (17.2 kg m~(-2)) > grassland (16.3 kg m~(-2)) > forestland (15.2 kg m~(-2)) > cropland (14.1 kg m~(-2)) > gully land (6.4 kg m~(-2)). The ranking for SIC stocks were: grassland (104.1 kg m~(-2)) > forestland (96.2 kg m~(-2)) > shrubland (90.6 kg m~(-2)) > cropland (82.4 kg m~(-2)) > gully land (50.3 kg m~(-2)). Respective SOC and SIC stocks were at least 1.6-and 2.1-fold higher within the 100-500 cm depth range, as compared to the 0-100 cm depth range. Overall SOC and SIC stocks decreased significantly from the 5th to the 15th year of cultivation in croplands, and generally increased up to the 70th year. Both SOC and SIC stocks showed a turning point at 15 years cultivation, which should be considered when evaluating soil C sequestration. Estimates of C stocks greatly depends on soil sampling depth, and understanding the influences of land use and time will improve soil productivity and conservation in regions with deep soils.
来源 Journal of Geographical Sciences ,2020,30(6):921-934 【核心库】
DOI 10.1007/s11442-020-1762-3
关键词 cultivation time ; deep soil ; Gutun watershed ; land use ; inorganic carbon ; organic carbon
地址

1. Institute of Earth Environment, CAS, State Key Laboratory of Loess and Quaternary Geology, Xi'an, 710061  

2. Xi'an AMS Center, Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi'an, 710061  

3. University of Chinese Academy of Sciences, Beijing, 100049  

4. Interdisciplinary Research Center of Earth Science Frontier, Beijing Normal University, Beijing, 100875  

5. CAS Center for Excellence in Quaternary Science and Global Change, CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061  

6. Institute of Global Environmental Change, Xi'an Jiaotong Univer, Xi'an, 710049  

7. Open Studio for Oceanic-Continental Climate and Environment Changes, Pilot National Laboratory for Marine Science and Technology (Qingdao), Shandong, Qingdao, 266237  

8. Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710049

语种 英文
文献类型 研究性论文
ISSN 1009-637X
学科 农业基础科学
基金 The Strategic Priority Research Program of the Chinese Academy of Sciences ;  国家自然科学基金 ;  National Research Program for Key Issues in Air Pollution Control
文献收藏号 CSCD:6728902

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