Effects of Shifting Spring Phenology on Growing Season Carbon Uptake in High Latitudes
Effects of Shifting Spring Phenology on Growing Season Carbon Uptake in High Latitudes
复制标题
春季物候变化对高纬度地区生长季碳吸收的影响
DOI：
10.1029/2022jg006900
复制
发表时间：
2022-12
期刊：
影响因子：
--
通讯作者：
Gensuo Jia
中科院分区：
文献类型：
--
作者：
Jiangshan Zheng;Xiyan Xu;Gensuo Jia
物候变化不仅改变了生长季的长度，还改变了陆地-大气之间的水和能量交换，进而影响生态系统的碳吸收。然而，在高纬度生态系统中，生长季开始(SOS)的变化如何影响整个生长季的碳吸收还没有得到充分的探索。在这里，我们利用多个卫星和气候数据集研究了2000-2020年期间SOS变化对北部高纬度(>；50°N)碳吸收的影响及其机制。我们发现生长季早期(4-6月)和生长后期(7-9月)的总初级生产力(GPP)对SOS变化的响应是不同的。高级SOS导致赛季初GPP增加，而赛季末GPP略有下降。较早的SOS是由于前期较暖，导致降雪比下降，土壤和大气较为干燥。早季植被需水量低时，温暖干燥的气候条件保证了较好的太阳辐射，提高了植被水分利用效率(WUE)，增强了光合作用。由于前期降雪较少，植被过度利用水分，土壤和大气干旱状况持续到后期，因此水分利用效率减弱，对光合作用有轻微的抑制作用。相反，由于与高级SOS相反的热湿条件，延迟的SOS导致早期季节GPP减少，而后期GPP略有增加。随着高纬度地区继续变暖，植被光合作用能力的季节差异加剧，SOS可能会进一步推进。
Phenological shifts not only alter the growing season length, but also modify land-atmosphere exchanges of water and energy, which in turn affects ecosystem carbon uptake. However, how changes in the start of the growing season (SOS) affect carbon uptake throughout growing season has not been fully explored for high-latitude ecosystems. Here, we investigated the impacts of SOS shifts on carbon uptake and the mechanisms over 2000–2020 in the northern high latitudes (>50°N) using multiple satellite and climate data sets. We found a contrasting response of gross primary productivity (GPP) in the early (April–June) and late (July–September) growing season to SOS shifts. Advanced SOS resulted in increased early-season GPP, whereas slightly decreased late-season GPP. The earlier SOS resulted from a warmer early season, which induced a decline of snow to precipitation ratio, therefore drier soil and atmosphere. In the early season, when water requirement of vegetation was low, the warm and dry conditions ensured favorable solar radiation and improved vegetation water use efficiency (WUE), thus enhancing photosynthesis. The dry soil and atmosphere conditions extended to the late season due to less snow and excessive water utilization by vegetation in the early season, which therefore slightly suppressed photosynthesis by weakening WUE. Conversely, the delayed SOS resulted in reduced early-season GPP and slightly enhanced late-season GPP due to the opposite thermal and moisture conditions to that of advanced SOS. The SOS is likely to be further advanced as warming continues in the high latitudes, intensifying seasonal contrasts in vegetation photosynthesis capacity.
登录
查看更多内容
较早的融雪导致阿拉斯加春季植被提前返绿
影响因子：
6.2
作者：
Jiangshan Zheng;Gensuo Jia;Xiyan Xu
通讯作者：
Xiyan Xu
欧亚大陆北方森林物候及其气候响应的卫星监测
影响因子：
3.4
作者：
Li Haibo;Wang Cuizhen;Zhang Lijuan;Li Xiaxiang;Zang Shuying
通讯作者：
Zang Shuying
影响因子：
5
作者：
Li, Xing;Xiao, Jingfeng
通讯作者：
Xiao, Jingfeng
影响因子：
16.6
作者：
Berner LT;Massey R;Jantz P;Forbes BC;Macias-Fauria M;Myers-Smith I;Kumpula T;Gauthier G;Andreu-Hayles L;Gaglioti BV;Burns P;Zetterberg P;D'Arrigo R;Goetz SJ
通讯作者：
Goetz SJ
DOI：
10.1016/j.jag.2020.102110
发表时间：
2020-07
期刊：
Int. J. Appl. Earth Obs. Geoinformation
影响因子：
--
作者：
Donal S. O’Leary;D. Inouye;R. Dubayah;Chengquan Huang;G. Hurtt
通讯作者：
Donal S. O’Leary;D. Inouye;R. Dubayah;Chengquan Huang;G. Hurtt