1. Comparative Analysis of Soil Respiration Dynamics and Heterotrophic Respiration Sensitivity to Warming in a Subalpine Coniferous Forest and a Subtropical Evergreen Broadleaf Forest in Southwest China
- Author
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Phyo, Zayar, Wu, Chuansheng, Zhang, Yiping, Sha, Liqing, Song, Qinghai, Liu, Yuntong, Liang, Naishen, Myo, Sai Tay Zar, Lu, Zhiyun, Xu, Kung, Huang, Hua, Liu, Weiwei, and Zhou, Wenjun
- Abstract
To quantify variations in the components of soil respiration (Rs), elucidate the impact of warming on heterotrophic respiration (Rh) in subalpine coniferous forest (LJ) and in subtropical evergreen broadleaf forest (ALS), and discern differences in the dominant regulating factors of soil respiration components between the two forest ecosystems. This study used multichannel automated soil efflux chambers with three treatments: control (CK), trenching (NR), and trenching with warming (NRW) in LJ and ALS in Southwest China. The results reveal that Rswas higher in ALS than in LJ, and the ratio of Rhto Rswas significantly higher in LJ than in ALS. Although soil temperature (ST) and soil moisture (SM) also identified the main controlling factors of Rs, Rh, Ra, and the warming effect of Rhwhen considering carbon cycle modeling, the sensitivity of Rsto temperature (Q10) was not significantly different between Rs, Rh, and Rafor both forests. The greater warming effect on Rhin LJ than in ALS is due to the combination of lower temperatures, recalcitrant organic matter, and slower litter decomposition in subalpine coniferous forests. This study confirmed that Rs, Rhand Rahad positive correlation with STand SMfor two ecosystems. This study has proven that the greater the warming effect of Rhis, the greater the contribution of Rhto Rsbecomes, and the lesser the contribution of Rato Rsin LJ becomes compared to that of ALS.
- Published
- 2024
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