干旱区研究

干旱区研究 >

2023 , Vol. 40 >Issue 5: 808 - 817

DOI: https://doi.org/10.13866/j.azr.2023.05.13

生态与环境

替代稳态下阜康北部荒漠生态弹性的时空格局

  • 许毓哲 ,
  • 林涛 ,
  • 李君
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  • 1.中国科学院新疆生态与地理研究所，荒漠与绿洲生态国家重点实验室，新疆 乌鲁木齐 830011
    2.中国科学院大学，北京 100049
    3.自然资源部荒漠-绿洲生态监测与修复工程技术创新中心，新疆 乌鲁木齐 830022
    4.中国科学院新疆生态与地理研究所，阿克苏绿洲农田生态系统国家野外科学观测研究站，新疆 乌鲁木齐 830011
许毓哲（1997-），男，硕士研究生，主要从事资源环境遥感研究. E-mail: xuyuzhe20@mails.ucas.ac.cn

收稿日期: 2022-12-08

  修回日期: 2023-01-10

  网络出版日期: 2023-05-30

基金资助

第三次新疆综合科学考察项目(2021xjkk0900)

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Spatial and temporal patterns of ecological resilience under alternative stable states in the desert of the north Fukang region

  • Yuzhe Xu ,
  • Tao Lin ,
  • Jun Li
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  • 1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi 830011, Xinjiang, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Technology Innovation Center for Desert -Oasis Ecological Monitoring and Restoration, Ministry of Natural Resources, Urumqi 830022, Xinjiang, China
    4. Akesu National Station of Observation and Research for Oasis Agro-ecosystem, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi 830011, Xinjiang, China

Received date: 2022-12-08

  Revised date: 2023-01-10

  Online published: 2023-05-30

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摘要

替代稳态下的荒漠生态系统生态弹性反映了系统承受环境干扰后的恢复能力，这对认识荒漠生态系统过程具有重要的理论意义。当前研究主要集中在湖泊和森林生态系统，而有关荒漠生态系统弹性的研究普遍未考虑替代稳态，也鲜有考虑弹性的时间变化。本研究以阜康北部的古尔班通古特沙漠南缘至沙漠腹地样带为例，运用2001年1月至2020年12月的MODIS全球植被指数遥感数据，采用BFAST（Breaks for Additive Season and Trend）和状态空间建模对数据进行处理和提取，通过不同状态的退出时间量化得出不同时段替代稳态条件下的生态弹性，同时根据计算结果分析了该地区生态弹性时空演变特征及其影响机制。研究结果表明：（1） 研究区弹性+和弹性-整体呈现先下降后上升的趋势，但沙漠边缘至腹地空间差异显著。（2） 生态弹性对降水变化存在滞后响应。（3） 降水季节变化的差异会降低降水量与生态弹性之间的相关性。综上所述，生态弹性的空间分布总体受降水格局控制，但立地条件导致的植被空间异质性增加了生态弹性空间分布的复杂性，而生态弹性与降水变化的关系取决于植被群落构成、植物对降水变化响应、降水量变化趋势和季节分布。本研究在认识荒漠生态系统功能稳定性维持机制以及荒漠生态保护和修复方面具有重要的理论与实践意义。

关键词： 替代稳态; 生态弹性; 退出时间; 古尔班通古特沙漠

本文引用格式

许毓哲 , 林涛 , 李君 . 替代稳态下阜康北部荒漠生态弹性的时空格局[J]. 干旱区研究, 2023 , 40(5) : 808 -817 . DOI: 10.13866/j.azr.2023.05.13

Abstract

The ecological resilience of desert ecosystems under alternative stable states reflects the ecosystem’s ability to recover from environmental disturbances, which has important theoretical implications for understanding the desert ecosystem processes. Recent research has focused on some intensively studied ecosystems such as lakes and forests, whereas studies related to the ecological resilience of desert ecosystems have hardly considered alternative stable states as well as the temporal changes in resilience. In this study, based on the MODIS global vegetation index from January 2001 to December 2020, we used Breaks for Additive Season and Trend and state-space modeling to determine the temporal-spatial pattern of ecological resilience under alternative stable states quantified by the exit times for a transect extending from the southern edge to the hinterland of Gurbantunggut Desert in north Fukang. Moreover, mechanisms underlying the temporal-spatial pattern of ecological resilience were explored. The results of this study indicated the following: (1) Resilience+ and Resilience- showed a decreasing trend within the study period but with significant differences between the southern edge and the hinterland of the desert. (2) Ecological resilience also showed a lagged response to precipitation changes. (3) Differences in the seasonal patterns of precipitation could weaken the correlation between precipitation and ecological resilience. In summary, the spatial distribution of ecological resilience is generally controlled by the precipitation patterns, but the spatial heterogeneity of vegetation due to site conditions increases the complexity of the spatial distribution of ecological resilience, with the relationship between ecological resilience and precipitation resulting from the combined effects of the composition of vegetation, adaptation of plants to changes in precipitation, and the seasonal pattern of precipitation. Our study is important for understanding the mechanisms that desert ecosystems utilize to maintain functional stability as well as in desert conservation and ecological restoration.

Key words： alternative stable states; ecological resilience; exit time; Gurbantunggut Desert

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