干旱区生态环境知识资源中心(Arid): An unexpectedly large count of trees in the West African Sahara and Sahel

Arid

DOI	10.1038/s41586-020-2824-5
	An unexpectedly large count of trees in the West African Sahara and Sahel
	Brandt, Martin; Tucker, Compton J.; Kariryaa, Ankit; Rasmussen, Kjeld; Abel, Christin; Small, Jennifer; Chave, Jerome; Rasmussen, Laura Vang; Hiernaux, Pierre; Diouf, Abdoul Aziz; Kergoat, Laurent; Mertz, Ole; Igel, Christian; Gieseke, Fabian; Schoning, Johannes; Li, Sizhuo; Melocik, Katherine; Meyer, Jesse; Sinno, Scott; Romero, Eric; Glennie, Erin; Montagu, Amandine; Dendoncker, Morgane; Fensholt, Rasmus
通讯作者	Brandt, M (corresponding author), Univ Copenhagen, Dept Geosci & Nat Resource Management, Copenhagen, Denmark. ; Brandt, M (corresponding author), NASA, Goddard Space Flight Ctr, Sci Syst & Applicat Inc, Greenbelt, MD 20771 USA. ; Tucker, CJ (corresponding author), NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
来源期刊	NATURE
ISSN	0028-0836
EISSN	1476-4687
出版年	2020
卷号	587 期号:7832 页码:78-+
英文摘要	A large proportion of dryland trees and shrubs (hereafter referred to collectively as trees) grow in isolation, without canopy closure. These non-forest trees have a crucial role in biodiversity, and provide ecosystem services such as carbon storage, food resources and shelter for humans and animals(1,2). However, most public interest relating to trees is devoted to forests, and trees outside of forests are not well-documented(3). Here we map the crown size of each tree more than 3 m(2) in size over a land area that spans 1.3 million km(2) in the West African Sahara, Sahel and sub-humid zone, using submetre-resolution satellite imagery and deep learning(4). We detected over 1.8 billion individual trees (13.4 trees per hectare), with a median crown size of 12 m(2), along a rainfall gradient from 0 to 1,000 mm per year. The canopy cover increases from 0.1% (0.7 trees per hectare) in hyper-arid areas, through 1.6% (9.9 trees per hectare) in arid and 5.6% (30.1 trees per hectare) in semi-arid zones, to 13.3% (47 trees per hectare) in sub-humid areas. Although the overall canopy cover is low, the relatively high density of isolated trees challenges prevailing narratives about dryland desertification(5-7), and even the desert shows a surprisingly high tree density. Our assessment suggests a way to monitor trees outside of forests globally, and to explore their role in mitigating degradation, climate change and poverty.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000621036900001
WOS关键词	LIVELIHOODS ; FOREST ; COVER ; DRYLANDS ; QUALITY ; HISTORY ; SYSTEM
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
来源机构	French National Research Institute for Sustainable Development ; E17
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349082
作者单位	[Brandt, Martin; Rasmussen, Kjeld; Abel, Christin; Rasmussen, Laura Vang; Mertz, Ole; Li, Sizhuo; Fensholt, Rasmus] Univ Copenhagen, Dept Geosci & Nat Resource Management, Copenhagen, Denmark; [Brandt, Martin; Kariryaa, Ankit; Small, Jennifer; Hiernaux, Pierre; Melocik, Katherine; Meyer, Jesse; Sinno, Scott; Romero, Eric; Glennie, Erin] NASA, Goddard Space Flight Ctr, Sci Syst & Applicat Inc, Greenbelt, MD 20771 USA; [Tucker, Compton J.; Small, Jennifer; Melocik, Katherine; Meyer, Jesse; Sinno, Scott; Romero, Eric; Glennie, Erin] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; [Kariryaa, Ankit; Schoning, Johannes] Univ Bremen, HCI Grp, Bremen, Germany; [Chave, Jerome] Univ Paul Sabatier, Lab Evolut & Diversite Biol, CNRS, UPS,IRD, Toulouse, France; [Hiernaux, Pierre] Pastoralisme Conseil, Caylus, France; [Diouf, Abdoul Aziz] Ctr Suivi Ecol, Dakar, Senegal; [Kergoat, Laurent] UPS, Geosci Environm Toulouse GET, UMR 5563, UMR 5563,CNRS,IRD,CNES, Toulouse, France; [Igel, Christian; Gieseke, Fabian] U...
推荐引用方式 GB/T 7714	Brandt, Martin,Tucker, Compton J.,Kariryaa, Ankit,et al. An unexpectedly large count of trees in the West African Sahara and Sahel[J]. French National Research Institute for Sustainable Development, E17,2020,587(7832):78-+.
APA	Brandt, Martin.,Tucker, Compton J..,Kariryaa, Ankit.,Rasmussen, Kjeld.,Abel, Christin.,...&Fensholt, Rasmus.(2020).An unexpectedly large count of trees in the West African Sahara and Sahel.NATURE,587(7832),78-+.
MLA	Brandt, Martin,et al."An unexpectedly large count of trees in the West African Sahara and Sahel".NATURE 587.7832(2020):78-+.