干旱区生态环境知识资源中心(Arid): Divergent controls of exchangeable calcium and iron oxides in regulating soil organic carbon content across climatic gradients in arid regions

Arid

DOI	10.1016/j.agrformet.2024.109939
	Divergent controls of exchangeable calcium and iron oxides in regulating soil organic carbon content across climatic gradients in arid regions
	Wang, Zhufeng; Jing, Xin; Lin, Litao; Wang, Yugang; Feng, Wenting
通讯作者	Feng, WT
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2024
卷号	349
英文摘要	Elevational gradients offer powerful natural experiments for testing how soil organic carbon (SOC) responds to environmental changes (e.g., climate, plant inputs, and soil geochemistry) across a wide range. Exchangeable calcium (Ca ex ) emerges as an important geochemical driving factor of SOC content in arid regions, yet its significance in regulating SOC content across climatic gradients remains poorly understood. Here, we assessed the relative importance of climate variables, plant inputs, and geochemical properties in controlling SOC content along a 2,500-m elevational gradient in the Tianshan Mountains. We explored the roles of Ca ex in regulating the interactions between iron (Fe)-(hydro)oxides and SOC content. We found that soil Ca ex (i.e., Na 2 SO 4 -extracted), likely controlled by biological cycling, was the major contributor to SOC content in cold and wet climatic conditions (1,400 - 3,035 m a.s.l.), where soils had relatively high Fe o and low pH (5.8-7.9). In contrast, amorphous Fe, not Ca ex , was the most important regulator for SOC content in warm and dry climatic conditions (481 - 1,240 m a.s.l.) with Ca-rich and high pH soils (7.6-9.0). Moreover, the results of partial correlation analysis suggested that Ca ex competed with Fe-(hydro)oxides in modulating SOC content in cold and wet climatic conditions due to low soil pH, but facilitated SOC stabilization by Fe-(hydro)oxides in warm and dry climatic conditions. Although climatic variables and plant inputs were significantly associated with SOC content, our findings indicated that Ca ex and Fe-(hydro)oxides had divergent controls over SOC content across climatic gradients in arid regions, depending on soil pH level. Our study reveals new insights on the potential role of cations in complexation of organic matter with minerals across a wide range of environmental conditions in the field.
英文关键词	Arid regions Climate Elevational gradient Geochemical properties Mountain systems Organic-mineral association
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001221845300001
WOS关键词	TIANSHAN MOUNTAINS ; MATTER ASSOCIATIONS ; VEGETATION TYPES ; STORAGE ; SEQUESTRATION ; REGRESSION ; FE ; CLASSIFICATION ; STABILIZATION ; NITROGEN
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/402630
推荐引用方式 GB/T 7714	Wang, Zhufeng,Jing, Xin,Lin, Litao,et al. Divergent controls of exchangeable calcium and iron oxides in regulating soil organic carbon content across climatic gradients in arid regions[J],2024,349.
APA	Wang, Zhufeng,Jing, Xin,Lin, Litao,Wang, Yugang,&Feng, Wenting.(2024).Divergent controls of exchangeable calcium and iron oxides in regulating soil organic carbon content across climatic gradients in arid regions.AGRICULTURAL AND FOREST METEOROLOGY,349.
MLA	Wang, Zhufeng,et al."Divergent controls of exchangeable calcium and iron oxides in regulating soil organic carbon content across climatic gradients in arid regions".AGRICULTURAL AND FOREST METEOROLOGY 349(2024).