干旱区生态环境知识资源中心(Arid): Vegetation type controls root turnover in global grasslands

Arid

DOI	10.1111/geb.12866
	Vegetation type controls root turnover in global grasslands
	Wang, Jinsong 1; Sun, Jian 1; Yu, Zhen 2; Li, Yong 3; Tian, Dashuan 1; Wang, Bingxue 1; Li, Zhaolei 1; Niu, Shuli 1,4
通讯作者	Niu, Shuli
来源期刊	GLOBAL ECOLOGY AND BIOGEOGRAPHY
ISSN	1466-822X
EISSN	1466-8238
出版年	2019
卷号	28 期号:4 页码:442-455
英文摘要	Aim Root turnover is an important process determining carbon and nutrient cycling in terrestrial ecosystems. It is an established fact that root turnover is jointly regulated by climatic, edaphic and biotic factors. However, the relative importance of these forces in determining the global patterns of root turnover time is far from clear. Location Global. Time period 1946-2017. Major taxa studied Grasslands. Methods We compiled a database of 141 sites with 433 observations on root turnover time and applied structural equation modelling (SEM) to investigate the relative contribution of climate, soil properties and vegetation type to the observed variations in root turnover time. Results Root turnover time was 3.1 years on average across the global grasslands and differed significantly among grassland types (tropical grassland and savanna, temperate grassland and meadow, alpine grassland and meadow, tundra and desert). It decreased with mean annual temperature, mean annual precipitation and Palmer drought severity index but increased with soil organic carbon content, total nitrogen content and carbon : nitrogen ratio. Soil bulk density and soil texture also significantly affected root turnover time, with clay content negatively correlating to root turnover time and explaining more variations than bulk density and sand content. The SEM showed that climatic factors had dominant effects on root turnover time when vegetation type was not considered. Vegetation type became the primary driver when it was included in the SEM. Main conclusions Our results indicate that the influences of climatic and edaphic factors on root turnover time are predominantly manifested through vegetation type. The critical role of precipitation as revealed for the first time in this study challenges our current understanding of climate impacts on root turnover time. The findings necessitate accurate representation of vegetation type in Earth system models to predict root function dynamics under global change.
英文关键词	climate interaction root turnover soil nutrients soil physical properties structural equation modelling vegetation type
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000460419900003
WOS关键词	TERRESTRIAL PLANT-PRODUCTION ; LIFE-SPAN ; FOREST ECOSYSTEMS ; FUNCTIONAL TRAITS ; FINE ROOTS ; SOIL ; CLIMATE ; CARBON ; DYNAMICS ; PATTERNS
WOS类目	Ecology ; Geography, Physical
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216094
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China; 2.Iowa State Univ, Dept Ecol Evolut & Organismal Biol EEOB, Ames, IA USA; 3.Res Chinese Acad Forestry, Beijing Key Lab Wetland Serv & Restorat, Inst Wetland, Beijing, Peoples R China; 4.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wang, Jinsong,Sun, Jian,Yu, Zhen,et al. Vegetation type controls root turnover in global grasslands[J]. 中国科学院地理科学与资源研究所,2019,28(4):442-455.
APA	Wang, Jinsong.,Sun, Jian.,Yu, Zhen.,Li, Yong.,Tian, Dashuan.,...&Niu, Shuli.(2019).Vegetation type controls root turnover in global grasslands.GLOBAL ECOLOGY AND BIOGEOGRAPHY,28(4),442-455.
MLA	Wang, Jinsong,et al."Vegetation type controls root turnover in global grasslands".GLOBAL ECOLOGY AND BIOGEOGRAPHY 28.4(2019):442-455.