干旱区生态系统跃变：以输沙势为外部驱动力

陈宁; 王新平

doi:10.7522/j.issn.1000-694X.2016.00137

中国沙漠 >

2017 , Vol. 37 >Issue 1: 73 - 80

DOI: https://doi.org/10.7522/j.issn.1000-694X.2016.00137

生物与土壤

干旱区生态系统跃变：以输沙势为外部驱动力

陈宁 ,
王新平

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1. 中国科学院寒区旱区环境与工程研究所沙坡头沙漠研究试验站, 甘肃兰州 730000;
2. 中国科学院大学, 北京 100049

陈宁(1988-),男,河南商丘人,博士研究生,主要研究方向为干旱区生态学和系统生态学。E-mail:chenning.cn2015@gmail.com

收稿日期: 2016-05-19

修回日期: 2016-09-29

网络出版日期: 2017-01-20

基金资助

国家自然科学基金项目（41530750，41371101）

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Regime Shifts in Dryland Ecosystems: drift potential as external driver

Chen Ning ,
Wang Xinping

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1. Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2016-05-19

Revised date: 2016-09-29

Online published: 2017-01-20

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摘要

生态系统靠近跃变点时可能发生跃变，骤然从一种稳定状态跃变到另外一种稳定态。然而以往关于干旱区的系统跃变的研究主要集中于水文过程，对其他过程（如风积过程）关注不够，并且很少考虑外部驱动力与系统状态之间的交互作用。我们以输沙势（风积过程）为系统跃变的外部驱动力，利用空间隐式模型，研究干旱区生态系统的跃变动态，并考虑输沙势与系统状态之间的交互作用对系统跃变动态的影响。结果表明：当输沙势较低（<93 VU）或较高（>230 VU）时植被态和裸地态分别是唯一的稳定态，而当输沙势为93~230 VU时，植被态和裸地态都可稳定存在。考虑交互作用使系统退化（恢复）时的跃变点从无交互作用的230 VU（93 VU）推移到了高强度交互作用的337 VU（213 VU），在研究干旱区生态系统的系统跃变时，可以以输沙势为外部驱动力，并考虑输沙势与系统状态之间交互作用。

关键词： 系统跃变; 荒漠化; 输沙势; 外部驱动力; 干旱区; 生态系统

本文引用格式

陈宁 , 王新平 . 干旱区生态系统跃变：以输沙势为外部驱动力[J]. 中国沙漠, 2017 , 37(1) : 73 -80 . DOI: 10.7522/j.issn.1000-694X.2016.00137

Abstract

Some ecosystems could shift from one stable state into another alternative stable state as approaching fold-bifurcation point (or tipping point). In ecosystem level, however, previous studies in dryland ecosystems mainly focused on hydrologic processes, and largely ignored other processes, such as wind erosion. Furthermore, previous studies generally didn't take the interaction between external driver and ecosystem state into consideration when studying regime shifts. Using a mean-field model, this paper investigated the dynamics of regime shifts in drylands with drift potential as external driver. The results suggested that the vegetation state and the bare state were the only stable states when drift potential was smaller than 93 VU and 230 VU, respectively. And drift potential was between 93 VU and 230 VU, both vegetation state and bare state could stably exist. Moreover, considering the interaction between external driver and ecosystem state would greatly extend the region of stable equilibrium to higher drift potential, i.e., tipping points in degradation moved from 230 VU (93 VU) under non-interactive situation to 337 VU (213 VU) under strong interactive situation. This study suggests that one can the dynamics of dryland ecosystems with drift potential as driver and should consider the interaction between drift potential and system state. This work puts forward a novel idea and view for researches in dryland ecosystems, and provides theoretical supports for maintaining ecosystem functions and restoring degraded ecosystems in drylands.

Key words： regime shifts; desertification; drift potential; external driver; dryland; ecosystems

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