globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12734
论文题名:
Ecosystem properties of semiarid savanna grassland in West Africa and its relationship with environmental variability
作者: Tagesson T.; Fensholt R.; Guiro I.; Rasmussen M.O.; Huber S.; Mbow C.; Garcia M.; Horion S.; Sandholt I.; Holm-Rasmussen B.; Göttsche F.M.; Ridler M.-E.; Olén N.; Lundegard Olsen J.; Ehammer A.; Madsen M.; Olesen F.S.; Ardö J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期:1
起始页码: 250
结束页码: 264
语种: 英语
英文关键词: Dryland ; Eddy covariance ; Evapotranspiration ; Latent heat flux ; Net ecosystem exchange ; Sahel ; Savanna ; Sensible heat flux
Scopus关键词: Zornia ; biological model ; climate ; ecology ; environment ; grassland ; growth, development and aging ; Poaceae ; procedures ; Senegal ; Climate ; Ecology ; Environment ; Grassland ; Models, Biological ; Poaceae ; Senegal
英文摘要: The Dahra field site in Senegal, West Africa, was established in 2002 to monitor ecosystem properties of semiarid savanna grassland and their responses to climatic and environmental change. This article describes the environment and the ecosystem properties of the site using a unique set of in situ data. The studied variables include hydroclimatic variables, species composition, albedo, normalized difference vegetation index (NDVI), hyperspectral characteristics (350-1800 nm), surface reflectance anisotropy, brightness temperature, fraction of absorbed photosynthetic active radiation (FAPAR), biomass, vegetation water content, and land-atmosphere exchanges of carbon (NEE) and energy. The Dahra field site experiences a typical Sahelian climate and is covered by coexisting trees (~3% canopy cover) and grass species, characterizing large parts of the Sahel. This makes the site suitable for investigating relationships between ecosystem properties and hydroclimatic variables for semiarid savanna ecosystems of the region. There were strong interannual, seasonal and diurnal dynamics in NEE, with high values of ~-7.5 g C m-2 day-1 during the peak of the growing season. We found neither browning nor greening NDVI trends from 2002 to 2012. Interannual variation in species composition was strongly related to rainfall distribution. NDVI and FAPAR were strongly related to species composition, especially for years dominated by the species Zornia glochidiata. This influence was not observed in interannual variation in biomass and vegetation productivity, thus challenging dryland productivity models based on remote sensing. Surface reflectance anisotropy (350-1800 nm) at the peak of the growing season varied strongly depending on wavelength and viewing angle thereby having implications for the design of remotely sensed spectral vegetation indices covering different wavelength regions. The presented time series of in situ data have great potential for dryland dynamics studies, global climate change related research and evaluation and parameterization of remote sensing products and dynamic vegetation models. © 2014 John Wiley & Sons Ltd.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61917
Appears in Collections:影响、适应和脆弱性

Files in This Item:

There are no files associated with this item.


作者单位: Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen, Denmark; Laboratoire d'Enseignement et de Recherche en Géomatique, Ecole Supérieure Polytechnique, Université Cheikh Anta Diop de Dakar, Dakar-Fann, Senegal; DHI GRAS A/S, Øster Voldgade 10, Copenhagen, DK-1350, Denmark; Research Unit SD6, World Agroforestry Centre, PO Box 30677-00100, Nairobi, Kenya; International Research Institute for Climate and Society (IRI), The Earth Institute, Columbia University, Palisades, NY, United States; Technical University of Denmark, Ørsteds Plads 348, Lyngby, Denmark; Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, Germany; Water Resources Department, Danish Hydrological Institute (DHI), Agern Allé 5, Hørsholm, Denmark; Department of Physical Geography and Ecosystem Science, Lund University, Sölvegatan 12, Lund, Sweden

Recommended Citation:
Tagesson T.,Fensholt R.,Guiro I.,et al. Ecosystem properties of semiarid savanna grassland in West Africa and its relationship with environmental variability[J]. Global Change Biology,2015-01-01,21(1)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Tagesson T.]'s Articles
[Fensholt R.]'s Articles
[Guiro I.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Tagesson T.]'s Articles
[Fensholt R.]'s Articles
[Guiro I.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Tagesson T.]‘s Articles
[Fensholt R.]‘s Articles
[Guiro I.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.