Different climate conditions drive variations in gross primary productivity and woody biomass accumulation in a temperate and a boreal conifer forest in Canada

作者：Paulina F. Puchi, Myroslava Khomik, Warren Helgason, M. Altaf Arain, Daniele Castagneri · 发表于：Agricultural and Forest Meteorology · 年份：2024 · DOI：10.1016/j.agrformet.2024.110125 · 被引用次数：18 · 研究领域：Forest ecology and management、Plant Water Relations and Carbon Dynamics、Tree-ring climate responses

• Investigated climate, GPP and xylem biomass in boreal and temperate Canadian forests. • Found strong GPP-biomass growth link in both forest types. • Boreal: cold growing seasons led to GPP and biomass growth reduction. • Temperate: drought linked to GPP and biomass growth reduction. Understanding the complex relationships between climate, forest carbon (C) uptake and biomass growth has become a research priority, crucial for assessing the climate change impacts on forest C sequestration. Such associations are expected to vary across biomes, due to different climate constraints on tree physiology. However, our understanding of the seasonal dynamics of long-term C sequestration and how climate influences them in different forest biomes is still limited. We investigated a boreal Pinus banksiana forest (Old Jack Pine, OJP) and a temperate Pinus strobus plantation (Turkey Point, TP39) in Canada. We aimed to assess the link between C uptake and above-ground woody biomass growth, and the effects of climate inter-annual variability on them. We used daily records of climate and gross primary productivity (GPP, period 1999–2019 at OJP and 2003–2018 at TP39), and investigated xylem biomass proxies at cell (cell wall area) and tree-ring level (ring wall area) from 1970 to 2019 at OJP, and from 1970 to 2018 at TP39. In both forests, the direct link between C sink and C source was revealed by the common inter-annual variability of GPP and xylem biomass. GPP and xylem biomass were mostly ...