干旱区生态环境知识资源中心(Arid): Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land

Arid

DOI	10.1007/s40333-023-0093-5
	Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land
	Yang, Yuxin; Gong, Lu; Tang, Junhu
通讯作者	Gong, L
来源期刊	JOURNAL OF ARID LAND
ISSN	1674-6767
EISSN	2194-7783
出版年	2023
卷号	15 期号:3 页码:344-358
英文摘要	Soil organic carbon (SOC) and its stable isotope composition reflect key information about the carbon cycle in ecosystems. Studies of carbon fractions in oasis continuous cotton-cropped fields can elucidate the SOC stability mechanism under the action of the human-land relationship during the oasification of arid land, which is critical for understanding the carbon dynamics of terrestrial ecosystems in arid lands under global climate change. In this study, we investigated the Alar Reclamation Area on the northern edge of the Tarim Basin, Xinjiang Uygur Autonomous Region of China, in 2020. In original desert and oasis farmlands with different reclamation years, including 6, 10, 18, and 30 a, and different soil depths (0-20, 20-40, 40-60 cm), we analyzed the variations in SOC, very liable carbon (C-VL), liable carbon (C-L), less liable carbon (C-LL), and non-liable carbon (C-NL) using the method of spatial series. The differences in the stable carbon isotope ratio (delta C-13) and beta (beta) values reflecting the organic carbon decomposition rate were also determined during oasification. Through redundancy analysis, we derived and discussed the relationships among SOC, carbon fractions, delta C-13, and other soil physicochemical properties, such as the soil water content (SWC), bulk density (BD), pH, total salt (TS), total nitrogen (TN), available phosphorus (AP), and available potassium (AK). The results showed that there were significant differences in SOC and carbon fractions of oasis farmlands with different reclamation years, and the highest SOC was observed at the oasis farmland with 30-a reclamation year. C-VL, C-L, C-LL, and C-NL showed significant changes among oasis farmlands with different reclamation years, and C-VL had the largest variation range (0.40-4.92 g/kg) and accounted for the largest proportion in the organic carbon pool. The proportion of C-NL in the organic carbon pool of the topsoil (0-20 cm) gradually increased. d13C varied from -25.61% to -22.58%, with the topsoil showing the most positive value at the oasis farmland with 10-a reclamation year; while the beta value was the lowest at the oasis farmland with 6-a reclamation year and then increased significantly. Based on the redundancy analysis results, the soil physicochemical properties, such as TN, AP, AK, and pH, were significantly correlated with C-L, and TN and AP were positively correlated with C-VL. However, delta C-13 was not significantly influenced by soil physicochemical properties. Our analysis advances the understanding of SOC dynamics during oasification, revealing the risk of soil carbon loss and its contribution to terrestrial carbon accumulation in arid lands, which could be useful for the sustainable development of regional carbon resources and ecological protection in arid ecosystem.
英文关键词	oasification soil organic carbon carbon fractions labile carbon delta C-13 arid land
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000983215000007
WOS关键词	DEPTH PROFILES ; ISOTOPE FRACTIONATION ; VERTICAL-DISTRIBUTION ; SOUTHERN XINJIANG ; LOESS PLATEAU ; RIVER-BASIN ; TARIM BASIN ; MATTER ; LABILE ; NITROGEN
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/2XILL650/397178
推荐引用方式 GB/T 7714	Yang, Yuxin,Gong, Lu,Tang, Junhu. Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land[J],2023,15(3):344-358.
APA	Yang, Yuxin,Gong, Lu,&Tang, Junhu.(2023).Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land.JOURNAL OF ARID LAND,15(3),344-358.
MLA	Yang, Yuxin,et al."Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land".JOURNAL OF ARID LAND 15.3(2023):344-358.