干旱区生态环境知识资源中心(Arid): Multivariate and scale-dependent controls of deep soil carbon after afforestation in a typical loess-covered region

Arid

DOI	10.1016/j.jenvman.2024.120998
	Multivariate and scale-dependent controls of deep soil carbon after afforestation in a typical loess-covered region
	Li, Ruifeng; Zhang, Xuanhua; Ji, Wangjia; He, Xiaoling; Li, Zhi
通讯作者	He, XL ; Li, Z
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2024
卷号	359
英文摘要	Afforestation is beneficial to improving soil carbon pools. However, due to the lack of deep databases, the variations in soil carbon and the combined effects of multiple factors after afforestation have yet to be adequately explored in >1 m deep soils, especially in areas with deep-rooted plants and thick vadose zones. This study examined the multivariate controls of soil organic carbon (SOC) and inorganic carbon (SIC) in 0-18 m deep under farmland, grassland, willow, and poplar in loess deposits. The novelty of this study is that the factors concurrently affecting deep soil carbon were investigated by multiwavelet coherence and structural equation models. On average, the SOC density (53.1 +/- 5.0 kg m(-2)) was only 12% of SIC density (425.4 +/- 13.8 kg m(-2)), with depth-dependent variations under different land use types. In the soil profiles, the variations in SOC were more obvious in the 0-6 m layer, while SIC variations were mainly observed in the 6-12 m layer. Compared with farmland (SOC: 17.0 kg m(-2); SIC: 122.9 kg m(-2)), the plantation of deciduous poplar (SOC: 28.5 kg m(-2); SIC: 144.2 kg m(-2)) increased the SOC and SIC density within the 0-6 m layer (p < 0.05), but grassland and evergreen willow impacted SOC and SIC density insignificantly. The wavelet coherence analysis showed that, at the large scale (>4 m), SOC and SIC intensities were affected by total nitrogen-magnetic susceptibility and magnetic susceptibility-water content, respectively. The structural equation model further identified that SOC density was directly controlled by total nitrogen (path coefficient = 0.64) and indirectly affected by magnetic susceptibility (path coefficient = 0.36). Further, SOC stimulated the SIC deposition by improving water conservation and electrical conductivity. This study provides new insights into afforestation-induced deep carbon cycles, which have crucial implications for forest management and enhancing ecosystem sustainability in arid regions.
英文关键词	Land use conversion Soil carbon sequestration Loess plateau Wavelet coherence Structural equation model
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001236144500001
WOS关键词	LAND-USE ; ORGANIC-MATTER ; PLATEAU ; WATER ; NITROGEN ; TILLAGE ; IMPACTS
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404472
推荐引用方式 GB/T 7714	Li, Ruifeng,Zhang, Xuanhua,Ji, Wangjia,et al. Multivariate and scale-dependent controls of deep soil carbon after afforestation in a typical loess-covered region[J],2024,359.
APA	Li, Ruifeng,Zhang, Xuanhua,Ji, Wangjia,He, Xiaoling,&Li, Zhi.(2024).Multivariate and scale-dependent controls of deep soil carbon after afforestation in a typical loess-covered region.JOURNAL OF ENVIRONMENTAL MANAGEMENT,359.
MLA	Li, Ruifeng,et al."Multivariate and scale-dependent controls of deep soil carbon after afforestation in a typical loess-covered region".JOURNAL OF ENVIRONMENTAL MANAGEMENT 359(2024).