Arid
DOI10.1007/s11258-018-0873-8
Impact of rainfall frequency and intensity on inter- and intra-annual satellite-derived EVI vegetation productivity of an Acacia caven shrubland community in Central Chile
Sepulveda, Marcelo1,2; Bown, Horacio E.2; Miranda, Marcelo D.3; Fernandez, Bonifacio1
通讯作者Sepulveda, Marcelo
来源期刊PLANT ECOLOGY
ISSN1385-0237
EISSN1573-5052
出版年2018
卷号219期号:10页码:1209-1223
英文摘要

Seasonal precipitation is critical for springtime plant activity, and a direct connection may exist between the rainfall frequency and intensity with vegetation productivity in dryland ecosystems. This connection has been poorly quantified in the semi-arid Mediterranean region of Chile. In this work, we describe the effects of the monthly frequency () and intensity () of rainfall events on two satellite-derived Enhanced Vegetation Index (EVI) descriptors: the time-integrated vegetation index (mEVI), a surrogate for total potential productivity, and the maximum vegetation index (iEVI), a surrogate for maximum photosynthetic activity, in a shrubland ecosystem dominated by Acacia caven. Time series analyses over a period of 15years (2000-2014) were carried out for assessing their relationships and lags. Rainfall descriptors largely explained the temporal variation in vegetation productivity. Values of mEVI and iEVI showed a short-term statistical dependence of up to 4 months with precipitation frequency, meaning that vegetation productivity was delayed compared to the occurrence of rain events. This delay might be related to soils acting as water reservoirs being used by different plant types at different times and soil depths, i.e., herbs using water from the upper soil horizons with small lags in relation to rain pulses, while shrubs drawing water from deeper in the soil would exhibit greater range of lags. The asynchrony between rainfall events and suitable environmental conditions for growth, and the ability of plants to draw water at different soil depths with different lags may be an ecological adaptation to the high inter- and intra-annual rainfall variability.


英文关键词Acacia caven Time series analysis EVI Mediterranean ecosystems Chile
类型Article
语种英语
国家Chile
收录类别SCI-E
WOS记录号WOS:000444008300007
WOS关键词NET PRIMARY PRODUCTION ; CHIHUAHUAN DESERT GRASSLAND ; SEMIARID ECOSYSTEMS ; PLANT-COMMUNITIES ; PRECIPITATION PATTERNS ; RESOURCE PULSES ; SOIL-MOISTURE ; GAS-EXCHANGE ; TIME-SERIES ; RESPONSES
WOS类目Plant Sciences ; Ecology ; Forestry
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology ; Forestry
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/212198
作者单位1.Pontificia Univ Catolica Chile, Fac Ingn, Dept Ingn Hidraul & Ambiental, Ave Vicuna Mackenna 4860, Santiago, Chile;
2.Univ Chile, Fac Ciencias Forestales & Conservac Nat, Ave Santa Rosa 11315, Santiago, Chile;
3.Pontificia Univ Catolica Chile, Dept Ecosistemas & Medio Ambiente, Fac Agron & Ingn Forestal, Ave Vicuna Mackenna 4860, Santiago, Chile
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Sepulveda, Marcelo,Bown, Horacio E.,Miranda, Marcelo D.,et al. Impact of rainfall frequency and intensity on inter- and intra-annual satellite-derived EVI vegetation productivity of an Acacia caven shrubland community in Central Chile[J],2018,219(10):1209-1223.
APA Sepulveda, Marcelo,Bown, Horacio E.,Miranda, Marcelo D.,&Fernandez, Bonifacio.(2018).Impact of rainfall frequency and intensity on inter- and intra-annual satellite-derived EVI vegetation productivity of an Acacia caven shrubland community in Central Chile.PLANT ECOLOGY,219(10),1209-1223.
MLA Sepulveda, Marcelo,et al."Impact of rainfall frequency and intensity on inter- and intra-annual satellite-derived EVI vegetation productivity of an Acacia caven shrubland community in Central Chile".PLANT ECOLOGY 219.10(2018):1209-1223.
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