中国农业气象 ›› 2023, Vol. 44 ›› Issue (02): 133-143.doi: 10.3969/j.issn.1000-6362.2023.02.005

• 农业生物气象栏目 • 上一篇    下一篇

基于日光诱导叶绿素荧光探测植被光合对气象干旱的响应

齐晓雯,苗晨,王鹤松   

  1. 1. 北京林业大学生态与自然保护学院,北京 100083;2. 国家遥感中心,北京 100036;3. 新疆农业大学林学与风景园林学院,乌鲁木齐 830052
  • 收稿日期:2022-03-15 出版日期:2023-02-20 发布日期:2023-01-16
  • 通讯作者: 王鹤松,教授,研究方向为全球变化生态学。 E-mail:wanghs119@126.com
  • 作者简介:齐晓雯,E-mail: 1023946458@qq.com
  • 基金资助:
    国家自然科学基金项目(42265012;31770765)

Detecting Response of Vegetation Photosynthesis to Meteorological Drought Based on Solar-Induced Chlorophyll Fluorescence

QI Xiao-wen, MIAO Chen, WANG He-song   

  1. 1. School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China; 2. National Remote Sensing Center of China, Beijing 100036; 3. College of Forestry and Landscape Architecture, Xinjiang Agricultural University, Urumqi, 830052
  • Received:2022-03-15 Online:2023-02-20 Published:2023-01-16

摘要: 干旱是世界范围内最常见、最复杂的气象灾害,一定程度上会削弱陆地生态系统的碳汇功能。开展植被对干旱响应的研究并选择敏感的干旱探测因子,有助于掌握干旱对植被的影响规律、理解植被对干旱胁迫的响应过程和机理。本研究以日光诱导叶绿素荧光(SIF)数据和标准化降水蒸散发指数(SPEI)为基础,利用最大相关系数法分析中国区域内2000−2018年生长季植被光合对气象干旱的响应,比较不同干旱梯度、不同植被对干旱响应的敏感性以及SPEI响应时间尺度的变化特征。结果表明:(1)SIF与SPEI具有很好的相关性,显著正相关的面积达到75.05%,主要分布在东北、西南和青藏高原地区,且大部分地区对SPEI的响应时间尺度以中短期为主。(2)SIF在春季对SPEI显著相关的区域占比最少,夏季达到最高,秋季又略有下降。对干旱响应的时间尺度在春季以短期为主,而夏季响应时间尺度长的区域较春季有所增加。(3)半干旱区对干旱的敏感性最强,干旱区最弱,不同气候区对干旱的响应时间尺度均以短期为主。(4)研究所选植被类型均能较早地对干旱做出响应,其中,草地对干旱最敏感,林地和农田相对较弱,阔叶林比针叶林对干旱更敏感。研究结果表明在不同干旱梯度和不同植被类型下SIF均能快速反映环境胁迫对植被光合作用的影响。

关键词: 日光诱导叶绿素荧光, 气象干旱, 标准化降水蒸散发指数, 植被对干旱的响应

Abstract: Drought is the most common and complex meteorological disaster in the world, which weakens the carbon sink function of terrestrial ecosystem. Exploring the response of vegetation to drought and choosing sensitive factors for drought detection will be helpful to obtain the impact of drought on vegetation and to understand the response process and the mechanism of vegetation to drought stress. Based on the Solar-Induced chlorophyll Fluorescence (SIF) and the standardized precipitation evapotranspiration index (SPEI), a maximum correlation coefficient method was used to investigate the response of vegetation photosynthesis to meteorological drought in China during the growing season from 2000 to 2018. Sensitivity and response time scale of vegetation to drought was compared for different drought levels and different vegetation types. The results showed that: (1) about 75.05% of total areas of China had a significant positive correlation between SIF and SPEI. These areas were mainly distributed in the northeast, southwest and Qinghai Tibet Plateau of China. The response time scale of most regions to SPEI was mainly medium and short term. (2) The proportion of SIF to SPEI was the lowest in spring, the highest in summer, and slightly decreased in autumn. The response time scale to drought was mainly short-term in spring, while the region with long response time scale in summer was increased compared with in spring. (3) The semi-arid region was the most sensitive to drought, while the arid region was the weakest. The response time scale of different climatic regions to drought was mainly short-term. (4) The selected vegetation types responded to drought in a short time scale. Grassland was the most sensitive to drought, while woodland and cropland were relatively weak. Besides, broad-leaved forest was more sensitive to drought than coniferous forest. The results showed that under different drought gradients and different vegetation types, SIF could quickly reflect the impact of environmental stress on vegetation photosynthesis.

Key words: Solar-induced chlorophyll fluorescence (SIF), Meteorological drought, Standardized precipitation evapotranspiration index (SPEI), Response of vegetation to drought