气候变化领域集成服务门户(CCPortal): Long-Term Patterns in Forest Soil CO2 Flux in a Pacific Northwest Temperate Rainforest

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DOI	10.3390/f15010161
	Long-Term Patterns in Forest Soil CO2 Flux in a Pacific Northwest Temperate Rainforest
	Fischer, Dylan G.; Chamberlain, Zoe R.; Cook, Claire E.; Martin, Randall Adam; Mueller, Liam O.
发表日期	2024
EISSN	1999-4907
起始页码	15
结束页码	1
卷号	15 期号:1
英文摘要	Soil CO2 efflux (F-s) plays an important role in forest carbon cycling yet estimates of F-s can remain unconstrained in many systems due to the difficulty in measuring F-s over long time scales in natural systems. It is important to quantify seasonal patterns in F-s through long-term datasets because individual years may show patterns that are not reflective of long-term averages. Additionally, determining predictability of net patterns in soil carbon flux based on environmental factors, such as moisture and temperature, is critical for appropriately modeling forest carbon flux. Ecosystems in moderate climates may have strong CO2 efflux even during winter, and so continuous quantification of annual variability is especially important. Here, we used a 2008-2023 dataset in a lowland temperate forest ecosystem to address two main questions: (1) What are the seasonal patterns in F-s in a highly productive temperate rainforest? (2) How is average F-s across our study area predicted by average coincident temperature, soil moisture and precipitation totals? Data showed clear seasonality where F-s values are higher in summer. We also find F-s across our measurement network was predicted by variation in abiotic factors, but the interaction between precipitation/moisture and temperature resulted in greater complexity. Specifically, in spring a relatively strong relationship between air temperature and F-s was present, while in summer the relationship between temperature and F-s was flat. Winter and autumn seasons showed weak positive relationships. Meanwhile, a negative relationship between precipitation and Fs was present in only some seasons because most precipitation falls outside the normal growing season in our study system. Our data help constrain estimates of soil CO2 fluxes in a temperate rainforest ecosystem at similar to 14-20 kg C ha(-1) day(-1) in summer and autumn, and 6.5-10.5 kg C ha(-1) day(-1) in winter and spring seasons. Together, estimates suggest this highly productive temperate rainforest has annual soil-to-atmosphere fluxes of CO2 that amount to greater than 4.5 Mg C ha(-1) year(-1). Sensitivity of such fluxes to regional climate change will depend on the balance of F-s determined by autotrophic phenological responses versus heterotrophic temperature and moisture sensitivity. Relatively strong seasonal variation coupled with comparatively weak responses to abiotic variables suggest F-s may be driven largely by seasonal trends in autotrophic respiration. Accordingly, plant and tree responses to climate may have a stronger effect on F-s in the context of climate change than temperature or moisture changes alone.
英文关键词	soil respiration; C flux; carbon; forest; soils
语种	英语
WOS研究方向	Forestry
WOS类目	Forestry
WOS记录号	WOS:001151899700001
来源期刊	FORESTS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/293048
作者单位	University of California System; University of California San Diego
推荐引用方式 GB/T 7714	Fischer, Dylan G.,Chamberlain, Zoe R.,Cook, Claire E.,et al. Long-Term Patterns in Forest Soil CO2 Flux in a Pacific Northwest Temperate Rainforest[J],2024,15(1).
APA	Fischer, Dylan G.,Chamberlain, Zoe R.,Cook, Claire E.,Martin, Randall Adam,&Mueller, Liam O..(2024).Long-Term Patterns in Forest Soil CO2 Flux in a Pacific Northwest Temperate Rainforest.FORESTS,15(1).
MLA	Fischer, Dylan G.,et al."Long-Term Patterns in Forest Soil CO2 Flux in a Pacific Northwest Temperate Rainforest".FORESTS 15.1(2024).