Dataset Information

Soil warming increases soil temperature sensitivity in subtropical Forests of SW China.

ABSTRACT: Background:Soil respiration (R S ) plays an important role in the concentration of atmospheric CO2 and thus in global climate patterns. Due to the feedback between R S and climate, it is important to investigate R S responses to climate warming. Methods:A soil warming experiment was conducted to explore R S responses and temperature sensitivity (Q 10) to climate warming in subtropical forests in Southwestern China, and infrared radiators were used to simulate climate warming. Results:Warming treatment increased the soil temperature and R S value by 1.4 °C and 7.3%, respectively, and decreased the soil water level by 4.2% (%/%). Both one- and two-factor regressions showed that warming increased the Q 10 values by 89.1% and 67.4%, respectively. The effects of water on Q 10show a parabolic relationship to the soil water sensitivity coefficient. Both R S and Q 10 show no acclimation to climate warming, suggesting that global warming will accelerate soil carbon release.

SUBMITTER: Yuan C

PROVIDER: S-EPMC6765358 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Soil warming increases soil temperature sensitivity in subtropical Forests of SW China.

Yuan Chaoxiang C Zhu Guiqing G Yang Shuangna S Xu Gang G Li Yingyun Y Gong Hede H Wu Chuansheng C

PeerJ 20190925

<h4>Background</h4>Soil respiration (R S ) plays an important role in the concentration of atmospheric CO2 and thus in global climate patterns. Due to the feedback between R S and climate, it is important to investigate R S responses to climate warming.<h4>Methods</h4>A soil warming experiment was conducted to explore R S responses and temperature sensitivity (Q 10) to ...[more]

PMID: 31579603

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Project description:Background and aimsSoil respiration is the second-largest terrestrial carbon (C) flux, and soil temperature and soil moisture are the main drivers of temporal variation in soil respiration and its components. Here, we quantified the contribution of soil temperature, soil moisture, and their intersection on the variation in soil respiration and its components of the evergreen broad-leaved forests (EBF), mixed evergreen and deciduous broad-leaved forests (MF), deciduous broad-leaved forests (DBF), and subalpine coniferous forests (CF) along an elevation gradient.MethodsWe measured soil respiration of four types of forests along the elevation gradient in Shennongjia, Hubei China based on the trenching experiments. We parameterized the relationships between soil respiration and soil temperature, soil moisture, and quantified the intersection of temperature and moisture on soil respiration and its components.ResultsTotal soil respiration (R S), heterotrophic respiration (R H), and autotrophic respiration (R A) were significantly correlated with soil temperature in all four forests. The Q 10 value of soil respiration significantly differed among the four types of forest, and the Q 10 was 3.06 for EBF, 3.75 for MF, 4.05 for DBF, and 4.49 for CF, respectively. The soil temperature explained 62%-81% of the variation in respiration, while soil temperature and soil moisture together explained 91%-97% of soil respiration variation for the four types of forests. The variation from the intersection of soil temperature and moisture were 12.1%-25.0% in RS, 1.0%-7.0% in R H, and 17.1%-19.6% in R A, respectively.ConclusionsOur results show that the temperature sensitivity (Q 10) of soil respiration increased with elevation. The intersection between soil temperature and soil moisture had strong effects on soil respiration, especially in R H. We demonstrated that the intersection effects between soil temperature and soil moisture on soil respiration were essential to understand the response of soil respiration and its components to climate change.

Dataset Information

Soil warming increases soil temperature sensitivity in subtropical Forests of SW China.

Publications

Soil warming increases soil temperature sensitivity in subtropical Forests of SW China.

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