Soil respiration and its partitioning in different components in tropical primary and secondary mountain rain forests in Hainan Island, China

doi:10.1093/jpe/rtw080

Abstract

Abstract: Aims Soil respiration is one of the most important components in the carbon (C) cycle in terrestrial ecosystems. To investigate the contribution of each component of C cycle to the total soil C efflux, we quantified the rates of litter, root, and other mineral soil respiration from 2012 to 2014 in the primary and secondary tropical mountain rain forests in Hainan Island, China.
Methods The seasonal dynamics of soil (R s), non-litter (R NL) and non-root (R NR) respiration rates were measured using an automatic chamber system (Li-8100). Litter removal and root removal treatments were used to assess the contribution of litter and roots to belowground C production. We estimated the annual C efflux of each component of soil respiration in primary and secondary forests using a temperature-based exponential model and analyzed the impact of each component in each forest type.
Important findings The annual total soil C efflux was significantly higher in the primary rain forest (1567±205g C m ?2 yr^-1) than that in the secondary forest (1300±70g C m ?2 yr^-1, P < 0.05). The litter, root, and mineral soils contributed 22% (349±185g C m ?2 yr^-1), 38% (589±100g C m ?2 yr^-1), and 40% (628±128g C m ?2 yr^-1) to the total soil C efflux in primary rain forest, respectively. In secondary forest, these three components contributed 11% (148±35g C m ?2 yr^-1), 45% (572±259g C m ?2 yr^-1), and 44% (580±226g C m ?2 yr^-1), respectively. The temperature sensitivity (Q 10) of R s (2.70±0.14) in the primary forest was significantly higher than that in the secondary forest (2.34±0.12), with the Q 10 values for respiration decreasing in the order of R NR> R s> R NL. These results show that the difference in litter respiration between primary and secondary forest caused the major difference in annual soil respiration efflux between these two forest types. In addition, the litter respiration is more sensitive to the soil temperature than the other soil respiration components.

Key words: soil respiration, litter, root, mineral soil, temperature sensitivity, tropical mountain rain forest

摘要：
Aims Soil respiration is one of the most important components in the carbon (C) cycle in terrestrial ecosystems. To investigate the contribution of each component of C cycle to the total soil C efflux, we quantified the rates of litter, root, and other mineral soil respiration from 2012 to 2014 in the primary and secondary tropical mountain rain forests in Hainan Island, China.
Methods The seasonal dynamics of soil (R s), non-litter (R NL) and non-root (R NR) respiration rates were measured using an automatic chamber system (Li-8100). Litter removal and root removal treatments were used to assess the contribution of litter and roots to belowground C production. We estimated the annual C efflux of each component of soil respiration in primary and secondary forests using a temperature-based exponential model and analyzed the impact of each component in each forest type.
Important findings The annual total soil C efflux was significantly higher in the primary rain forest (1567±205g C m ?2 yr^-1) than that in the secondary forest (1300±70g C m ?2 yr^-1, P < 0.05). The litter, root, and mineral soils contributed 22% (349±185g C m ?2 yr^-1), 38% (589±100g C m ?2 yr^-1), and 40% (628±128g C m ?2 yr^-1) to the total soil C efflux in primary rain forest, respectively. In secondary forest, these three components contributed 11% (148±35g C m ?2 yr^-1), 45% (572±259g C m ?2 yr^-1), and 44% (580±226g C m ?2 yr^-1), respectively. The temperature sensitivity (Q 10) of R s (2.70±0.14) in the primary forest was significantly higher than that in the secondary forest (2.34±0.12), with the Q 10 values for respiration decreasing in the order of R NR> R s> R NL. These results show that the difference in litter respiration between primary and secondary forest caused the major difference in annual soil respiration efflux between these two forest types. In addition, the litter respiration is more sensitive to the soil temperature than the other soil respiration components.

Lai Jiang, Suhui Ma, Zhang Zhou, Tianli Zheng, Xingxing Jiang, Qiong Cai, Peng Li, Jianxiao Zhu, Yide Li, Jingyun Fang. Soil respiration and its partitioning in different components in tropical primary and secondary mountain rain forests in Hainan Island, China[J]. J Plant Ecol, 2017, 10(5): 791-799.

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[2]	Hui Jiang, Yuan-Yuan Zeng, Xu-Dong Liu, Francisco J Corpas, Md Mahadi Hasan, Feng-Ping Li, Xue-Qian Tian, Yu-Hang Zhang, Rui-Yun He, Xiang-Wen Fang. Rooting for survival: ABA-mediated hormonal integration driving primary root elongation under drought stress [J]. J Plant Ecol, 2026, 19(2): 1-.
[3]	Ying Guo, Lin Zhang, Wei Shen, Guangshuai Cui, Yanhong Tang, Tianxiang Luo. Nitrogen and carbon supply controls tree radial growth at an alpine treeline [J]. J Plant Ecol, 2026, 19(2): 1-.
[4]	Xiao-Chong Zhang, Si-Tong Zhang, Yolima Carrillo, Hui-Liang Zhai, Yi-Zhu Zeng, Min Liu, Xiao-Feng Dong, Wei Sun, Jian-Ying Ma. Root exudates increase microbial biomass but decrease diversity and richness: a meta-analysis [J]. J Plant Ecol, 2026, 19(2): 1-.
[5]	Ruibing Duan, Zhongjie Shi, Rui Zhang, Lele Wang, Hui Jin, Zhenghu Zhou, Ying Jin. Leaf hydraulic and stomatal traits coordinated with rooting depth in desert species [J]. J Plant Ecol, 2026, 19(2): 1-.
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[14]	Fangling Ma, Yao Zheng, La Wei, Lin Xiang, Lifei Ren, Wenming Bai, Qiuying Tian, Wen-Hao Zhang. Soil chemistry exerts a more significant influence on bacterial responses to nitrogen disturbances than root exudates [J]. J Plant Ecol, 2025, 18(6): 1-37.
[15]	Yong Bao, Xiuxian Men, Chang Liao, Deping Zhai, Jinsheng Li, Yiyue Wang, Chi Wang, Xiaoli Cheng. Forest types predominantly regulate soil-dissolved organic matter dynamics along an elevational gradient in the Hengduan Mountains [J]. J Plant Ecol, 2025, 18(5): 1-45.