Self-Replication of Localized Vegetation Patches in Scarce Environments

被引:52
作者
Bordeu, Ignacio [1 ,5 ]
Clerc, Marcel G. [2 ]
Couteron, Piere [3 ]
Lefever, Rene [4 ]
Tlidi, Mustapha [4 ]
机构
[1] Univ Chile, Fac Ciencias, Dept Fis, Casilla 653, Santiago, Chile
[2] Univ Chile, Fac Ciencias Fis & Matemat, Dept Fis, Casilla 487-3, Santiago, Chile
[3] Cirad, IRD, UMR AMAP, F-34000 Montpellier, France
[4] Univ Libre Bruxelles, Fac Sci, Campus Plaine,CP 231, B-1050 Brussels, Belgium
[5] Imperial Coll London, Dept Math, 180 Queens Gate, London SW7 2BZ, England
关键词
PATTERN-FORMATION; CHOLESTERIC FINGERS; SPOTS; FACILITATION; CIRCLES; FRONTS; ORIGIN;
D O I
10.1038/srep33703
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Desertification due to climate change and increasing drought periods is a worldwide problem for both ecology and economy. Our ability to understand how vegetation manages to survive and propagate through arid and semiarid ecosystems may be useful in the development of future strategies to prevent desertification, preserve flora-and fauna within-or even make use of scarce resources soils. In this paper, we study a robust phenomena observed in semi-arid ecosystems, by which localized vegetation patches split in a process called self-replication. Localized patches of vegetation are visible in nature at various spatial scales. Even though they have been described in literature, their growth mechanisms remain largely unexplored. Here, we develop an innovative statistical analysis based on real field observations to show that patches may exhibit deformation and splitting. This growth mechanism is opposite to the desertification since it allows to repopulate territories devoid of vegetation. We investigate these aspects by characterizing quantitatively, with a simple mathematical model, a new class of instabilities that lead to the self-replication phenomenon observed.
引用
收藏
页数:11
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