气候变化领域集成服务门户(CCPortal): Shrub encroachment increases soil carbon and nitrogen stocks in alpine grassland ecosystems of the central Tibetan Plateau

CCPortal

DOI	10.1016/j.geoderma.2023.116468
	Shrub encroachment increases soil carbon and nitrogen stocks in alpine grassland ecosystems of the central Tibetan Plateau
	Zhao, Jingxue; Yang, Wen; Ji-Shi, Awei; Ma, Yunhe; Tian, Lihua; Li, Ruicheng; Huang, Ze; Liu, Yi-Fan; Leite, Pedro A. M.; Ding, Luming; Wu, Gao-Lin
发表日期	2023
ISSN	0016-7061
EISSN	1872-6259
卷号	433
英文摘要	Shrub encroachment can significantly affect the ecosystem structure and functioning of alpine grasslands. However, little is known about how this phenomenon alters soil organic carbon stocks (SOCS) and soil nitrogen stocks (STNS) in different alpine grassland ecosystems within the same region. Here we addressed this research gap by investigating the SOCS and STNS of encroached and non-encroached plots in alpine meadow and alpine steppe ecosystems on the central Tibetan Plateau. We found that, in both ecosystems, shrub encroachment significantly increased herbaceous plant richness, diversity, and aboveground biomass, but more notably in alpine meadow. Conversely, shrub encroachment increased belowground plant biomass in alpine steppe but had the opposite effect in alpine meadow, where belowground biomass was four times lower at encroached than at non-encroached plots. Importantly, encroaching shrubs resulted in significantly higher SOCS and STNS in both ecosystems, with alpine steppe showing the greatest carbon and nitrogen gains. The shrub encroached plots had 34.24 % and 97.25 % higher carbon stocks and 70.87 % and 67.34 % higher nitrogen stocks than non-encroached plots at the alpine meadow and alpine steppe, respectively. Increases in carbon and nitrogen stocks occurred mostly at the 10-30 cm soil layer and were highly correlated with shrub-induced changes in the herbaceous community composition. Overall, our results indicated that (1) shrub encroachment promoted carbon and ni-trogen accumulation in the soils of both alpine meadow and alpine steppe and (2) the degree of accumulation and the mechanisms behind these changes varied between the two alpine grasslands. Our findings advance the general understanding of the soil carbon and nitrogen dynamics in shrub-encroached alpine grasslands and highlight the importance of investigating how this phenomenon affects different ecosystems within the same region.
关键词	Alpine grasslands Shrub encroachment Soil carbon and nitrogen stocks Soil microbial carbon Soil microbial nitrogen
英文关键词	LARGE ALTITUDINAL GRADIENT; WOODY PLANT ENCROACHMENT; ORGANIC-MATTER; CLIMATE-CHANGE; MULTIFUNCTIONALITY; PRODUCTIVITY; RESPIRATION; SENSITIVITY; DIVERSITY; GROWTH
WOS研究方向	Soil Science
WOS记录号	WOS:000981806500001
来源期刊	GEODERMA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283827
作者单位	Lanzhou University; Lanzhou University; Southwest Minzu University; Peking University; Peking University; Northwest A&F University - China; Chinese Academy of Sciences; Institute of Soil & Water Conservation (ISWC), CAS; Texas A&M University System; Texas A&M University College Station; Chinese Academy of Sciences; Institute of Soil & Water Conservation (ISWC), CAS
推荐引用方式 GB/T 7714	Zhao, Jingxue,Yang, Wen,Ji-Shi, Awei,et al. Shrub encroachment increases soil carbon and nitrogen stocks in alpine grassland ecosystems of the central Tibetan Plateau[J],2023,433.
APA	Zhao, Jingxue.,Yang, Wen.,Ji-Shi, Awei.,Ma, Yunhe.,Tian, Lihua.,...&Wu, Gao-Lin.(2023).Shrub encroachment increases soil carbon and nitrogen stocks in alpine grassland ecosystems of the central Tibetan Plateau.GEODERMA,433.
MLA	Zhao, Jingxue,et al."Shrub encroachment increases soil carbon and nitrogen stocks in alpine grassland ecosystems of the central Tibetan Plateau".GEODERMA 433(2023).