甘肃河东地区植被物候及其对气候变化的响应

doi:10.13292/j.1000-4890.202203.023

生态学杂志 ›› 2022, Vol. 41 ›› Issue (4): 714-723.doi: 10.13292/j.1000-4890.202203.023

甘肃河东地区植被物候及其对气候变化的响应

姚荣鹏¹,张勃^1*,张耀文¹,王立兵^1,2

（¹西北师范大学地理与环境科学学院，兰州 730070； ²中国科学院空天信息创新研究院，数字地球重点实验室，北京 100049）

出版日期:2022-04-10 发布日期:2022-09-09

Vegetation phenology and its response to climate change in Hedong area of Gansu Province.

YAO Rong-peng¹, ZHANG Bo^1*, ZHANG Yao-wen¹, WANG Li-bing^1,2

(¹College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China; ²Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100049, China).

Online:2022-04-10 Published:2022-09-09

摘要/Abstract

摘要： 探究中纬度地区的植被物候及其对气候变化的响应，对理解生态系统对气候变化的响应以及预测区域生态系统的碳循环至关重要。本文基于2000—2018年MODIS EVI数据，利用非对称高斯函数（A-G）与动态阈值法提取森林与草地物候参数，结合气象数据探究河东地区植被物候与气候变化的响应关系。结果表明：森林与草地物候参数存在显著差异，两者生长季始期（start of growing season, SOS）的趋势均提前，生长季末期（end of growing season，EOS）的趋势分别提前和推迟，其中整体SOS呈提前趋势的面积占比61%，EOS呈推迟趋势的面积占比41%，生长季长度（length of growing season，LOS）呈延长趋势的面积占比53%；随着海拔和纬度的上升，植被SOS、EOS和LOS分别呈推迟、提前和缩短的趋势发展，但这种趋势正在减弱；季前气候对SOS和EOS存在不同程度、方向的影响，秋冬季高温推迟SOS，春季高温则提前SOS，春夏季降水增加提前EOS，秋季高温推迟EOS，且对于河东地区而言，最低气温影响更为显著；森林与草地之间对于气候变化的响应程度存在差异，森林SOS与最低气温的关系在3月由正相关转为负相关，草地SOS仅2月的关系为正相关，其他月份均为负相关，而降水仅在个别月份有明显的影响，森林（草地）的EOS与降水和最低气温均在9月（7月）由负相关转为正相关。

关键词: 植被物候, 气候变化, 偏最小二乘回归, 气候敏感性, 河东地区

Abstract: Understanding vegetation phenology of temperate regions and its responses to climate change is crucial for diagnosing the responses of ecosystems to regional climate change and projecting regional ecosystem carbon cycle. Based on MODIS EVI data from 2000 to 2018, we used asymmetric Gaussian (A-G) function and dynamic threshold method to extract the phenological parameters of forest and grassland in Hedong, Gansu Province. Combining meteorological data, we explored the response of vegetation phenology to climate change. A significant difference in phenological parameters was found between forest and grassland, both of which with a trend of advancing SOS, but advancing EOS for forest and delaying EOS for grassland. SOS displayed an advanced trend in 61% of the total area, a delayed trend of EOS in 41%, and a lengthened trend of LOS in 53%. With increasing elevation and latitude, SOS, EOS, and LOS presented a delayed, advanced, and shortened trend, respectively, but such a trend was weakening. The degrees and directions of the effects of preseason climate on SOS and EOS were different. Warming autumn and winter delayed SOS, while warming spring advanced SOS. Increasing precipitation in spring and summer advanced EOS, but warming autumn delayed EOS. The effect of minimum temperature was more critical in Hedong area. Forest and grassland differed in the degree of their response to climate change. The correlation between SOS of forest and the minimum temperature changed from positive to negative in March, and the grassland was only positive in February and negative in other months. Precipitation only had a significant impact in some individual months. The relationship between EOS of forest (grassland) and precipitation and minimum temperature changed from positive to negative in September (July).

Key words: vegetation phenology, climate change, partial least squares regression, climate sensitivity, Hedong area.

姚荣鹏, 张勃, 张耀文, 王立兵. 甘肃河东地区植被物候及其对气候变化的响应[J]. 生态学杂志, 2022, 41(4): 714-723.

YAO Rong-peng, ZHANG Bo, ZHANG Yao-wen, WANG Li-bing. Vegetation phenology and its response to climate change in Hedong area of Gansu Province.[J]. Chinese Journal of Ecology, 2022, 41(4): 714-723.

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甘肃河东地区植被物候及其对气候变化的响应

Vegetation phenology and its response to climate change in Hedong area of Gansu Province.

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