摘要
日光诱导叶绿素荧光(SIF)已被广泛应用于估算森林总初级生产力(GPP)、监测干旱、估算蒸散发和追踪植被物候等。本研究使用基于全球OCO-2的SIF产品(GOSIF)和不同时间尺度(1、3、6和12个月)的标准化降水蒸散指数(SPEI),探究2001—2021年中国东部季风区森林光合对干湿变化的响应。结果表明:干旱强度和干旱频率在东部季风区的不同地理分区的森林中存在差异。华北和华东地区森林的干旱发生强度较高,西北南部地区较小;华北地区森林的干旱发生较频繁,东北和西南地区的干旱发生频率较低。森林GOSIF与SPEI呈显著正相关关系的区域占比为74.1%,且森林植被光合对1个月时间尺度的SPEI响应最明显。在不同地理分区中,东北地区的森林植被光合对SPEI的响应最敏感,华北地区最弱;西北南部地区的森林耐旱性最强,东北地区最弱。在不同森林类型中,落叶阔叶林对SPEI的响应最敏感,然后依次为混交林、常绿阔叶林、常绿针叶林和落叶针叶林;常绿针叶林抵抗干旱胁迫的能力最强,然后依次为落叶针叶林、常绿阔叶林、落叶阔叶林和混交林。生长季(5—9月),森林植被光合在6月对SPEI的响应敏感性最高,7月最低;森林植被光合主要受1和3个月尺度的干湿变化影响,而在生长季中期(6—8月)和后期(9月),6和12个月尺度的干湿变化对森林植被光合的影响有所增强。
Solar-induced chlorophyll fluorescence(SIF)has been widely used in different area,such as estimating forest gross primary productivity(GPP),monitoring drought,estimating evapotranspiration and tracking vegetation phenology.Based on the Global OCO-2 SIF product(GOSIF)and the standardized precipitation evapotranspiration index(SPEI)at different temporal scales(1,3,6,and 12 months),we explored the responses of forest photosynthesis to dry-wet change over eastern monsoon China during 2001-2021.The results showed that there were differences in drought intensity and frequency among forests in different geographical regions.Forests in the North China and East China experienced higher drought intensity,while the southern part of Northwest China had lower drought intensity.Forests in the North China experienced more frequent droughts,while the Northeast China and Southwest China had lower drought frequencies.About 74.1%of the area where forest GOSIF was significantly and positively correlated with SPEI,and the response of photosynthesis to SPEI showed the most pronounced at the 1-month scale.In different geographical regions,photosynthesis in the Northeast China was the most sensitive to SPEI,whereas in the North China it was the least sensitive.The drought resistance of forests in the southern part of Northwest China exhibited the strongest,while in the Northeast China it was the weakest.Meanwhile,in different forest types,deciduous broad-leaved forests were the most sensitive to SPEI,followed by mixed forests,evergreen broad-leaved forests,evergreen needle-leaved forests and deciduous needle-leaved forests.Evergreen needle-leaved forests had the strongest resistance to drought stress,followed by deciduous needle-leaved forests,evergreen broad-leaved forests,deciduous broad-leaved forests and mixed forests.During the growing season(May-September),the response sensitivity of photosynthesis to SPEI was strongest in June and weakest in July.Dry-wet changes at the 1 and 3-month scales exerted the main impact on photosynthesi
作者
施曼华
同小娟
李俊
杨铭鑫
王雅婷
王音
SHI Manhua;TONG Xiaojuan;LI Jun;YANG Mingxin;WANG Yating;WANG Yin(School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China;Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Bejing 100101,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2024年第11期3107-3118,共12页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(32271875,31872703)
国家重点研发计划项目(2020YFA0608101)资助。
关键词
日光诱导叶绿素荧光
标准化降水蒸散指数
森林类型
气象干旱
东部季风区
solar-induced chlorophyll fluorescence
standardized precipitation evapotranspiration index
forest type
meteorological drought
eastern monsoon region
