Inorganic Carbon Pools and Their Drivers in Grassland and Desert Soils

被引：10

作者：

Dong, Longwei ^{[1
]}

Ran, Jinzhi ^{[1
]}

Luo, Jiali ^{[1
]}

Bai, Lin ^{[1
]}

Sun, Ying ^{[1
]}

Aqeel, Muhammad ^{[1
]}

Zhang, Yahui ^{[1
]}

Wang, Xiaoting ^{[1
]}

Du, Qiajun ^{[1
]}

Xiong, Junlan ^{[1
]}

Gong, Haiyang ^{[1
]}

Hou, Qingqing ^{[1
]}

Deng, Yan ^{[1
]}

Xia, Rui ^{[1
]}

Wang, Liang ^{[1
]}

Li, Fan ^{[1
]}

Dong, Chuancong ^{[2
]}

Hu, Weigang ^{[1
]}

Peng, Jie ^{[1
]}

Filimonenko, Ekaterina ^{[3
]}

Alharbi, Sulaiman Almwarai ^{[4
]}

Zhu, Jianxiao ^{[5
]}

Li, Xiaogang ^{[1
]}

Li, Chunjie ^{[5
]}

He, Jin-Sheng ^{[1
]}

Niklas, Karl J. ^{[6
]}

Kuzyakov, Yakov ^{[7
,8
]}

Deng, Jianming ^{[1
]}

机构：

[1] Lanzhou Univ, Coll Ecol, State Key Lab Herbage Improvement & Grassland Agro, Lanzhou, Peoples R China

[2] Forestry & Grassland Bur Xinjiang Uygur Autonomous, Urumqi, Peoples R China

[3] Tyumen State Univ, Inst Environm & Agr Biol XBIO, Tyumen, Russia

[4] King Saud Univ, Coll Sci, Dept Bot & Microbiol, Riyadh, Saudi Arabia

[5] Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Herbage Improvement & Grassland Agro, Lanzhou, Peoples R China

[6] Cornell Univ, Sch Integrat Plant Sci, Ithaca, NY USA

[7] Univ Goettingen, Dept Soil Sci Temperate Ecosyst, Dept Agr Soil Sci, Gottingen, Germany

[8] Kazan Fed Univ, Peoples Friendship Univ Russia RUDN Univ, Inst Environm Sci, Kazan, Russia

来源：

GLOBAL CHANGE BIOLOGY | 2024年 / 30卷 / 10期

基金：

中国国家自然科学基金;

关键词：

carbonates; desert; grassland; lithogenic carbonates; natural acidification; nitrogen deposition; pedogenic carbonates; PEDOGENIC CARBONATE; SEQUESTRATION; CHINA;

D O I：

10.1111/gcb.17536

中图分类号：

X176 [生物多样性保护];

学科分类号：

090705 ;

摘要：

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. Dryland in China contain 25 +/-$$ \pm $$ 3.8 petagrams of SIC in the top 100 cm. Desert soil inorganic carbon is mainly lithogenic carbonate, while grassland soil inorganic carbon is primarily pedogenic carbonate. Rhizosphere-driven acidification reduces SIC in grasslands.image

引用

页数：13

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