气候变化领域集成服务门户(CCPortal): Land Use Change Alters Soil Organic Carbon: Constrained Global Patterns and Predictors

CCPortal

DOI	10.1029/2023EF004254
	Land Use Change Alters Soil Organic Carbon: Constrained Global Patterns and Predictors
	Huang, Xingzhao; Ibrahim, Muhammed Mustapha; Luo, Yiqi; Jiang, Lifen; Chen, Ji; Hou, Enqing
发表日期	2024
EISSN	2328-4277
起始页码	12
结束页码	5
卷号	12 期号:5
英文摘要	Land use change (LUC) alters the global carbon (C) stock, but our estimation of the alteration remains uncertain and is a major impediment to predicting the global C cycle. The uncertainty is partly due to the limited number and geographical bias of observations, and limited exploration of its predictors. Here we generated a comprehensive global database of 5,980 observations from 790 articles. The number of sites evaluated is at least seven times larger than in previous meta-analyses. Our constrained estimates of different LUC's effects on soil organic C (SOC) and their variations across global climates reveal underestimation/overestimation in previous estimates. Converting forests and grasslands to croplands reduced SOC by 24.5% +/- 1.53% (-11.03 +/- 1.06 Mg ha-1) and 22.7% +/- 1.22% (-8.09 +/- 0.67 Mg ha-1), while 28.0% +/- 1.56% (4.46 +/- 0.42 Mg ha-1) and 33.5% +/- 1.68% (5.8 +/- 0.38 Mg ha-1) increases, respectively, were obtained in the reverse processes. Converting forests to grasslands decreased SOC by 2.1% +/- 1.22% (-1.13 +/- 0.44 Mg ha-1), while the reverse process increased SOC by 18.6% +/- 1.73% (3.31 +/- 0.51 Mg ha-1). Modeled relative importance of 10 drivers of LUC's impact on SOC revealed that higher initial SOC (iSOC) does not solely determine SOC loss in SOC-negative LUC scenarios as previously proposed. Across four decades, reconverting croplands to forests and grasslands recovered only 49.5% (6.1 +/- 0.51 Mg ha-1) and 75.3% (7.0 +/- 0.38 Mg ha-1) of the iSOC, respectively, indicating the need for protecting C-rich ecosystems. Our global data set advances information on LUC's effect on SOC and can be valuable to constrain Earth system models to reliably estimate global SOC stocks and plan climate change mitigation strategies. Land use change (LUC) could increase or decrease the global soil organic carbon (SOC) stock and affect carbon cycling and climate change, but estimating its effect size is the most uncertain aspect of the global carbon cycle. Available estimates vary among studies, most of which often use few observations that do not cover most global regions. To provide more accurate estimates of different LUC types' effects on SOC, we compiled a comprehensive database that contains 5,980 observations across all global regions; and revealed that previous studies have underestimated/overestimated these effects. We modeled the predictors of SOC change and found that previous conclusions that higher initial SOC is the main reason for higher organic carbon loss under negative LUC scenarios were inexact. We show that land use practices aimed at restoring SOC could only recover part of the amount lost during similar time frames; hence, it is important to protect carbon-rich ecosystems. Our study provides robust estimates of LUC's effect on SOC and provides data sets that can reliably assess and model the global carbon cycle and plan strategies for controlling global climate change. Comprehensive global database advances robust estimates of land use change's (LUCs) effect on soil organic carbon (SOC) vital for Earth system modeling Higher initial SOC does not solely control rapid SOC loss in carbon-negative LUC as often proposed Despite SOC buildup in the past four decades, the amount lost cannot be regained by restoration during similar time frames
英文关键词	Earth system; global carbon data sets; climate change; terrestrial ecosystems; anthropogenic carbon
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001221500400001
来源期刊	EARTHS FUTURE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/288211
作者单位	Anhui Agricultural University; Chinese Academy of Sciences; South China Botanical Garden, CAS; Cornell University; Chinese Academy of Sciences; Institute of Earth Environment, CAS
推荐引用方式 GB/T 7714	Huang, Xingzhao,Ibrahim, Muhammed Mustapha,Luo, Yiqi,et al. Land Use Change Alters Soil Organic Carbon: Constrained Global Patterns and Predictors[J],2024,12(5).
APA	Huang, Xingzhao,Ibrahim, Muhammed Mustapha,Luo, Yiqi,Jiang, Lifen,Chen, Ji,&Hou, Enqing.(2024).Land Use Change Alters Soil Organic Carbon: Constrained Global Patterns and Predictors.EARTHS FUTURE,12(5).
MLA	Huang, Xingzhao,et al."Land Use Change Alters Soil Organic Carbon: Constrained Global Patterns and Predictors".EARTHS FUTURE 12.5(2024).