Regime shifts in bistable water-stressed ecosystems due to amplification of stochastic rainfall patterns

被引：7

作者：

Cueto-Felgueroso, Luis ^{[1
,2
]}

Dentz, Marco ^{[3
]}

Juanes, Ruben ^{[2
]}

机构：

[1] Tech Univ Madrid, UPM, Dept Hydraul Energy & Environm, Madrid, Spain

[2] MIT, Dept Civil & Environm Engn, Cambridge, MA 02139 USA

[3] CSIC, IDAEA, Spanish Natl Res Council, Barcelona, Spain

来源：

PHYSICAL REVIEW E | 2015年 / 91卷 / 05期

基金：

欧洲研究理事会;

关键词：

SOIL-MOISTURE; CLIMATE; VEGETATION; SAVANNA; PRECIPITATION; RESILIENCE; STABILITY; DYNAMICS; BALANCE; STATES;

D O I：

10.1103/PhysRevE.91.052148

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We develop a framework that casts the point water-vegetation dynamics under stochastic rainfall forcing as a continuous-time random walk (CTRW), which yields an evolution equation for the joint probability density function (PDF) of soil-moisture and biomass. We find regime shifts in the steady-state PDF as a consequence of changes in the rainfall structure, which flips the relative strengths of the system attractors, even for the same mean precipitation. Through an effective potential, we quantify the impact of rainfall variability on ecosystem resilience and conclude that amplified rainfall regimes reduce the resilience of water-stressed ecosystems, even if the mean annual precipitation remains constant.

引用

页数：11

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