干旱区生态环境知识资源中心(Arid): Recovery of soil carbon and nitrogen stocks following afforestation with xerophytic shrubs in the Tengger Desert, North China

Arid

DOI	10.1016/j.catena.2022.106277
	Recovery of soil carbon and nitrogen stocks following afforestation with xerophytic shrubs in the Tengger Desert, North China
	Li, Xiaojun; Li, Yunfei; Xie, Ting; Chang, Zongqiang; Li, Xinrong
通讯作者	Li, XJ
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2022
卷号	214
英文摘要	Afforestation, as a key measure to curb land degradation and to drive the changes in soil C and N stocks and cycles, has been increasingly implemented in drylands worldwide. However, the long-term effects of this restoration practice on C accumulation in soil are still uncertain, especially because C-N interactions are poorly understood, which constrains the accurate assessment of potential soil C sequestration. In this study, we investigated the soil organic C (SOC) and soil total N (STN) storage in artificial shrublands in chronosequences in the Tengger Desert to address the hypothesis that afforestation with xerophytic shrubs significantly enhanced SOC and STN stocks in desert regions and that SOC and STN stocks would be positively correlated during the restoration processes. Our results showed that afforestation significantly enhanced SOC and STN accumulation. The SOC and STN stocks in 17-, 52-and 60-year-old artificial shrublands were 1.22, 2.67, 2.80 and 1.21, 2.33, 2.47 times greater than those in mobile sand dunes, respectively, with increased rates of 5.61 g C m(- 2) yr(- 1), 14.25 g Cm- 2 yr(- 1)and 13.30 g Cm-2 yr(- 1)and 1.27 g Nm(- 2) yr(- 1), 2.61 g Nm(- 2) yr(- 1)and 2.50 g Nm(- 2) yr(- 1), respectively. The significant enhancement of SOC and STN stocks primarily occurred in the upper 0-20 cm soil layer. SOC stocks were positively correlated with STN stocks and the C:N ratio, and the regression slopes increased with vegetation age, indicating a coupling relationship between SOC and STN stocks. Additionally, this finding suggests that the increase in STN stocks was slower than that of SOC during restoration, leading to an asynchrony in N supply and the demand and subsequent N limitations on SOC accumulation. It would take approximately 139 and 177 years to fully recover SOC and STN stocks in the 100 cm soil profile, respectively, in mobile sand dunes through afforestation with xerophytic shrubs in the Tengger Desert, which implied that afforestation-induced soil quality improvements were a long-term process and that soil conservation was a key issue in water-limited ecosystems; therefore, optimized management strategies are urgently needed.
英文关键词	Afforestation Soil carbon stock Soil nitrogen stock Soil carbon-nitrogen interaction Tengger Desert
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000798104100005
WOS关键词	LAND-USE CHANGE ; ORGANIC-CARBON ; TERRESTRIAL ECOSYSTEMS ; SAND DUNES ; SEQUESTRATION ; DYNAMICS ; DESERTIFICATION ; REVEGETATION ; ACCUMULATION ; FIXATION
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392099
推荐引用方式 GB/T 7714	Li, Xiaojun,Li, Yunfei,Xie, Ting,et al. Recovery of soil carbon and nitrogen stocks following afforestation with xerophytic shrubs in the Tengger Desert, North China[J],2022,214.
APA	Li, Xiaojun,Li, Yunfei,Xie, Ting,Chang, Zongqiang,&Li, Xinrong.(2022).Recovery of soil carbon and nitrogen stocks following afforestation with xerophytic shrubs in the Tengger Desert, North China.CATENA,214.
MLA	Li, Xiaojun,et al."Recovery of soil carbon and nitrogen stocks following afforestation with xerophytic shrubs in the Tengger Desert, North China".CATENA 214(2022).