Inorganic Carbon Pools and Their Drivers in Grassland and Desert Soils,Global Change Biology

当前位置： X-MOL 学术 › Glob. Change Biol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Inorganic Carbon Pools and Their Drivers in Grassland and Desert Soils
Global Change Biology ( IF 10.8 ) Pub Date : 2024-10-19 , DOI: 10.1111/gcb.17536
Longwei Dong, Jinzhi Ran, Jiali Luo, Lin Bai, Ying Sun, Muhammad Aqeel, Yahui Zhang, Xiaoting Wang, Qiajun Du, Junlan Xiong, Haiyang Gong, Qingqing Hou, Yan Deng, Rui Xia, Liang Wang, Fan Li, Chuancong Dong, Weigang Hu, Jie Peng, Ekaterina Filimonenko, Sulaiman Almwarai Alharbi, Jianxiao Zhu, Xiaogang Li, Chunjie Li, Jin‐Sheng He, Karl J. Niklas, Yakov Kuzyakov, Jianming Deng

Inorganic carbon is an important component of soil carbon stocks, exerting a profound influence on climate change and ecosystem functioning. Drylands account for approximately 80% of the global soil inorganic carbon (SIC) pool within the top 200 cm. Despite its paramount importance, the components of SIC and their contributions to CO2 fluxes have been largely overlooked, resulting in notable gaps in understanding its distribution, composition, and responses to environmental factors across ecosystems, especially in deserts and temperate grasslands. Utilizing a dataset of 6011 samples from 173 sites across 224 million hectares, the data revealed that deserts and grasslands in northwestern China contain 20 ± 2.5 and 5 ± 1.3 petagrams of SIC in the top 100 cm, representing 5.5 and 0.76 times the corresponding soil organic carbon stock, respectively. Pedogenic carbonates (PIC), formed by the dissolution and re‐precipitation of carbonates, dominated in grasslands, accounting for 60% of SIC with an area‐weighted density of 3.4 ± 0.4 kg C m−2 at 0–100 cm depth, while lithogenic carbonates (LIC), inherited from soil parent materials, prevailed in deserts, constituting 55% of SIC with an area‐weighted density of 7.1 ± 1.0 kg C m−2. Soil parent materials and elevation determined the SIC stocks by regulating the formation and loss of LIC in deserts, whereas natural acidification, mainly induced by rhizosphere processes including cation uptake and H+ release as well as precipitation, reduced SIC (mainly by PIC) in grasslands. Overall, the massive SIC pool underscores its irreplaceable role in maintaining the total carbon pool in drylands. This study sheds light on LIC and PIC and highlights the critical impact of natural acidification on SIC loss in grasslands.

更新日期：2024-10-19

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南