globalchange  > 气候变化事实与影响
DOI: 10.1038/s41598-019-38933-9
WOS记录号: WOS:000459094800015
论文题名:
Grass and tree cover responses to intra-seasonal rainfall variability vary along a rainfall gradient in African tropical grassy biomes
作者: D'; Onofrio, Donatella1,2; Sweeney, Luke2; von Hardenberg, Jost1; Baudena, Mara2
通讯作者: D&#39 ; Onofrio, Donatella ; Sweeney, Luke ; Baudena, Mara
刊名: SCIENTIFIC REPORTS
ISSN: 2045-2322
出版年: 2019
卷: 9
语种: 英语
WOS关键词: BURNED AREA ; PRODUCTIVITY RESPONSES ; SAVANNA TREES ; WOODY COVER ; CLIMATE ; DETERMINANTS ; TRENDS ; FOREST ; WATER ; DISTRIBUTIONS
WOS学科分类: Multidisciplinary Sciences
WOS研究方向: Science & Technology - Other Topics
英文摘要:

Although it is well known that mean annual rainfall (MAR) and rainfall seasonality have a key role in influencing the distribution of tree and grass cover in African tropical grassy biomes (TGBs), the impact of intra-seasonal rainfall variability on these distributions is less agreed upon. Since the prevalent mechanisms determining biome occurrence and distribution change with MAR, this research investigates the role of intra-seasonal rainfall variability for three different MAR ranges, assessing satellite data on grass and tree cover, rainfall and fire intervals at a sub-continental scale in sub-Saharan Africa. For MAR below 630 mm y(-1), rainfall frequency had a positive relationship with grass cover; this relationship however became mostly negative at intermediate MAR (630-1200 mm y(-1)), where tree cover correspondingly mostly increased with rainfall frequency. In humid TGBs, tree cover decreased with rainfall intensity. Overall, intra-seasonal rainfall variability plays a role in determining vegetation cover, especially in mesic TGBs, where the relative dominance of trees and grasses has previously been largely unexplained. Importantly, the direction of the effect of intra-seasonal variability changes with MAR. Given the predicted increases in rainfall intensity in Africa as a consequence of climate change, the effects on TGBs are thus likely to vary depending on the MAR levels.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/130108
Appears in Collections:气候变化事实与影响

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作者单位: 1.Natl Res Council ISAC CNR, Inst Atmospher Sci & Climate, Corso Fiume 4, I-10133 Turin, Italy
2.Univ Utrecht, Environm Sci Grp, Copernicus Inst Sustainable Dev, Princetonlaan 8a, NL-3584 CB Utrecht, Netherlands

Recommended Citation:
D',Onofrio, Donatella,Sweeney, Luke,et al. Grass and tree cover responses to intra-seasonal rainfall variability vary along a rainfall gradient in African tropical grassy biomes[J]. SCIENTIFIC REPORTS,2019-01-01,9
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