Effects of community structure on precipitation-use efficiency of grasslands in northern Tibet
Jiang, YB; Zhang, YJ; Zhu, JT; Tao, J; Zhang, T; Xi, Y
2017
Source PublicationJOURNAL OF VEGETATION SCIENCE
ISSN1100-9233
Volume28Issue:2Pages:281-290
AbstractQuestions(1) What are the primary factors determining the precipitation-use efficiency (PUE) in northern Tibet; (2) how does PUE respond to the gradients of biotic and abiotic factors; and (3) how do the composition and structure of plant functional groups (PFGs) affect PUE? LocationNorthern Tibet, China. MethodsA community survey of species composition, cover and above-ground net primary productivity (ANPP) was conducted within 1mx1m plots in 62 slightly disturbed sites. The effects of community features (total cover, cover of PFGs and species richness) and environmental factors [mean annual precipitation (MAP), mean annual temperature, surface soil bulk density, pH and C and N content] on PUE were identified through Pearson's correlation analyses, hierarchical partitioning and ordinary regressions. ResultsAlong the precipitation gradient, ANPP and PUE increased exponentially. Among the community features, total cover and cover of PFGs, including forbs and sedges, were the primary factors that determined PUE. The three cover variables, together with species richness, positively affected PUE and accounted for 47.6% of the total variation in PUE. Among the environmental factors, MAP, surface soil pH and N content were the most significantly related to PUE and accounted for 29.9% of the total contribution. ConclusionCommunities with high cover, species richness and nutrient content, but low soil bulk density, presented the highest PUE. At a regional scale, PUE depended mainly on plant cover, especially the cover of PFGs, namely, forbs and sedges. Environmental factors, including MAP and surface soil N and C content, positively affected PUE, whereas soil pH and bulk density negatively affected PUE. Our results highlight the importance of considering community structure to understand PUE variations in natural alpine grasslands.
SubtypeJournal
KeywordAbove-ground net primary productivity Environmental factors Tibet Plant cover Plant functional group Precipitation Precipitation-use efficiency Species richness
Subject AreaPlant Sciences ; Environmental Sciences & Ecology ; Forestry
WOS Subject ExtendedPlant Sciences ; Ecology ; Forestry
WOS KeywordRAIN-USE EFFICIENCY ; WATER-USE EFFICIENCY ; GREAT-PLAINS ; FUNCTIONAL DIVERSITY ; PRIMARY PRODUCTIVITY ; ABOVEGROUND BIOMASS ; ECOSYSTEM PROCESSES ; SPECIES RICHNESS ; CLIMATE-CHANGE ; UNITED-STATES
Indexed BySCI
Language英语
WOS IDWOS:000397559100006
PublisherWILEY
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44090
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Jiang, YB,Zhang, YJ,Zhu, JT,et al. Effects of community structure on precipitation-use efficiency of grasslands in northern Tibet[J]. JOURNAL OF VEGETATION SCIENCE,2017,28(2):281-290.
APA Jiang, YB,Zhang, YJ,Zhu, JT,Tao, J,Zhang, T,&Xi, Y.(2017).Effects of community structure on precipitation-use efficiency of grasslands in northern Tibet.JOURNAL OF VEGETATION SCIENCE,28(2),281-290.
MLA Jiang, YB,et al."Effects of community structure on precipitation-use efficiency of grasslands in northern Tibet".JOURNAL OF VEGETATION SCIENCE 28.2(2017):281-290.
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