西南地区植被NPP对多尺度气象干旱的响应研究
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桂林理工大学

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(42161028)西南喀斯特地区植被演变对多尺度气象干旱的响应机理


Response of vegetation NPP to multiscale meteorological drought in southwest China
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Guilin University of Technology

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    摘要:

    [目的]进入21世纪以来西南地区极端干旱事件频发,对植被生长产生了严重的负面影响,研究植被对不同时间尺度干旱的响应机理具有重要意义。[方法]基于西南地区2001-2019年的NPP数据和1-24月连续尺度的SPEI数据,采用相关分析法、最大值合成法及显著性检验等方法探究西南地区不同地貌类型植被NPP对多尺度SPEI的响应特征,并分析不同植被类型NPP对多尺度SPEI响应的差异性。[结果](1)在年际、季节及生长季尺度,植被 NPP与1-24月尺度SPEI的响应均以1-3月尺度占主导,表明植被NPP对短期干旱变化具有较好的响应,不同地貌分区响应时间表现出差异性。(2)空间上植被NPP与1-24月尺度SPEI的最大相关系数呈明显的异质性和季节性差异。年际相关性表现出从东南–西北呈显著正相关–显著负相关的变化趋势;季节相关性表现为夏季均以显著负相关占主导,春季、秋季和冬季均以显著正相关占主导,表明西南地区的夏季温度高且湿润,使植被生长受限;生长季正、负相关关系的区域面积比例相差不大,且呈显著正相关面积最大的地区为广西丘陵,呈显著负相关面积最大的地区为横断山地。(3)不同植被类型NPP对1-24月尺度SPEI的响应具有一定差异,尽管草地、灌丛、林地对SPEI的响应特征基本相似,但所有植被类型NPP在夏季随SPEI尺度的缩短呈负相关趋势越强烈。这表明,在夏季高温干旱条件下,各种植被类型都更容易受到干旱的影响。[结论]研究结果为西南地区生态系统的保护和修复提供了有效的科学支撑,同时为防灾减灾以及应对气候变化提供了重要的理论依据,有助于制定更具针对性的政策和措施,推动西南地区的可持续发展。

    Abstract:

    [Objective] Since the beginning of the 21st century, the frequent occurrence of extreme drought events in southwest China has had a serious negative impact on vegetation growth. It is of great significance to study the response mechanism of vegetation to drought at different time scales.[Methods] Based on vegetation net primary productivity (NPP) data with a spatial resolution of 500m from 2001 to 2019 and standardized precipitation Evapotranspiration index (SPEI) data on a continuous scale from 1–24 months in Southwest China, Correlation analysis, maximum synthesis method and significance test were used to analyze the responses of NPP of different geomorphic types and vegetation types to multi-scale SPEI in Southwest China.[Results] (1) In the annual scale, seasonal scale and growing season, the responses of vegetation NPP and SPEI at 1-24 months are dominated by the January-March scale, and vegetation NPP has a good response to short-term drought changes, but a relatively poor response to medium and long-term drought changes. (2) The response of NPP to SPEI at 1-24 month scale showed significant spatial heterogeneity and seasonal differences. The correlation between NPP and SPEI at 1-24 month scale in summer was significantly negative in the five major geomorphic regions. The response area of NPP in spring to SPEI at July-September scale was larger than that in other seasons. The area of vegetation NPP positively correlated with SPEI from 1 to 24 months in autumn and winter was larger, reaching 72% and 79.4%, respectively. In the correlation analysis between vegetation NPP and SPEI from 1 to 24 months in growing season, the area with the largest positive correlation was Guangxi Hills, while the area with the largest negative correlation was Hengduan Mountain. (3) The responses of NPP to SPEI from 1–24 months were different among different vegetation types. Although the response characteristics of grassland, scrub and forest land to SPEI were basically similar, the trend of negative correlation between NPP and SPEI became stronger with the scales of SPEI decreased in summer for all types of vegetation. This suggests that all types of vegetation are more susceptible to drought under high temperature and drought conditions in summer.[Conclusion] The research results provide effective scientific support for the protection and restoration of the ecosystem in Southwest China, and provide important theoretical basis for disaster prevention and reduction and coping with climate change, and help formulate more targeted policies and measures to promote the sustainable development of Southwest China.

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  • 收稿日期:2023-10-23
  • 最后修改日期:2023-11-23
  • 录用日期:2023-12-12
  • 在线发布日期: 2024-04-29
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