干旱区生态环境知识资源中心(Arid): Spatiotemporal partitioning of savanna plant functional type productivity along NATT

Arid

DOI	10.1016/j.rse.2020.111855
	Spatiotemporal partitioning of savanna plant functional type productivity along NATT
	Ma, Xuanlong; Huete, Alfredo; Moore, Caitlin E.; Cleverly, James; Hutley, Lindsay B.; Beringer, Jason; Leng, Song; Xie, Zunyi; Yu, Qiang; Eamus, Derek
通讯作者	Ma, XL
来源期刊	REMOTE SENSING OF ENVIRONMENT
ISSN	0034-4257
EISSN	1879-0704
出版年	2020
卷号	246
英文摘要	Realistic representations and simulation of mass and energy exchanges across heterogeneous landscapes can be a challenge in land surface and dynamic vegetation models. For mixed life-form biomes such as savannas, plant function is very difficult to parameterise due to the distinct physiological characteristics of tree and grass plant functional types (PFTs) that vary dramatically across space and time. The partitioning of their fractional contributions to ecosystem gross primary production (GPP) remains to be achieved at regional scale using remote sensing. The objective of this study was to partition savanna gross primary production (GPP) into tree and grass functional components based on their distinctive phenological characteristics. Comparison of the remote sensing partitioned GPP(tree) and GPP(grass) against field measurements from eddy covariance (EC) towers showed an overall good agreement in terms of both GPP seasonality and magnitude. We found total GPP, as well as its tree and grass components, decreased dramatically with rainfall over the North Australian Tropical Transect (NATT), from the Eucalyptus forest and woodland in the northern humid coast to the grasslands, Acacia woodlands and shrublands in the southern xeric interior. Spatially, GPP(tree) showed a steeper decrease with precipitation along the NATT compared to GPP(grass), thus tree/grass GPP ratios also decreased from the northern mesic region to the arid south region of the NATT. However, results also showed a second trend at the southern part of the transect, where tree-grass ratios and total GPP increased with decreasing mean annual precipitation, and this occurred in the physiognomic transition from hummock grasslands to Acacia woodland savannas. Total GPP and tree-grass GPP ratios across climate extremes were found to be primarily driven by grass layer response to rainfall dynamics. The grass-containing xeric savannas exhibited a higher hydroclimatic sensitivity, whereas GPP in the northern mesic savannas was fairly stable across years despite large variations in rainfall amount. The pronounced spatiotemporal variations in savanna vegetation productivity encountered along the NATT study area suggests that the savanna biome is particularly sensitive and vulnerable to predicted future climate change and hydroclimatic variability.
英文关键词	Plant functional types Phenology Tree-grass ratio MODIS EVI GPP NATT
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000537691800015
WOS关键词	TRIODIA HUMMOCK GRASSLAND ; VEGETATION COVER ; NORTHERN-TERRITORY ; TROPICAL SAVANNAS ; SEASONAL PATTERNS ; SPATIAL-PATTERNS ; ACACIA-ANEURA ; WATER FLUXES ; WOODY ; CARBON
WOS类目	Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology
来源机构	兰州大学 ; 西北农林科技大学 ; University of Western Australia
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324627
作者单位	[Ma, Xuanlong; Huete, Alfredo; Cleverly, James; Leng, Song; Yu, Qiang; Eamus, Derek] Univ Technol Sydney, Sch Life Sci, Ultimo, NSW, Australia; [Ma, Xuanlong] Lanzhou Univ, Coll Earth & Environm Sci, Lanzhou, Gansu, Peoples R China; [Moore, Caitlin E.] Univ Illinois, Carl R Woese Inst Genom Biol, Genom Ecol Global Change, Urbana, IL 61801 USA; [Hutley, Lindsay B.] Charles Darwin Univ, Res Inst Environm & Livelihoods, Casuarina, NT, Australia; [Beringer, Jason] Univ Western Australia, Sch Agr & Environm, Crawley, WA, Australia; [Xie, Zunyi] Univ Queensland, Ctr Biodivers & Conservat Sci, Sch Earth & Environm Sci, Brisbane, Qld, Australia; [Yu, Qiang] Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling, Shanxi, Peoples R China
推荐引用方式 GB/T 7714	Ma, Xuanlong,Huete, Alfredo,Moore, Caitlin E.,et al. Spatiotemporal partitioning of savanna plant functional type productivity along NATT[J]. 兰州大学, 西北农林科技大学, University of Western Australia,2020,246.
APA	Ma, Xuanlong.,Huete, Alfredo.,Moore, Caitlin E..,Cleverly, James.,Hutley, Lindsay B..,...&Eamus, Derek.(2020).Spatiotemporal partitioning of savanna plant functional type productivity along NATT.REMOTE SENSING OF ENVIRONMENT,246.
MLA	Ma, Xuanlong,et al."Spatiotemporal partitioning of savanna plant functional type productivity along NATT".REMOTE SENSING OF ENVIRONMENT 246(2020).