Autotrophic and heterotrophic soil respiration responds asymmetrically to drought in a subtropical forest in the Southeast China

Shide, Huang; Ye, Gongfu; Lin, Junyu; Chen, Kaituan; Xu, Xingkai; Ruan, Honghua; Tan, Feiquan; Chen, Han Y. H.

doi:10.1016/j.soilbio.2018.04.029

Cited by 55 publications

(56 citation statements)

References 56 publications

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“…Soil respiration usually increases with fine root biomass (Jiang et al, ; Sotta, Veldkamp, Schwendenmann, Guimarães, et al, ; van Straaten et al, ), soil microbial biomass (Huang et al, ; Wang et al, ), and canopy photosynthesis (Doughty et al, ; Hogberg et al, ; Kuzyakov, ). The present study shows that DW increased microbial biomass and LAI but decreased fine root biomass (Table ).…”

Section: Discussionmentioning

confidence: 99%

“…The present study shows that DW increased microbial biomass and LAI but decreased fine root biomass (Table ). Soil heterotrophic respiration could respond differently to precipitation changes with autotrophic respiration (Huang et al, ; Liu, Liu, et al, ; Lu et al, ). For example, Huang et al () found throughfall exclusion reduced soil heterotrophic respiration but increased autotrophic respiration in the dry season.…”

Section: Discussionmentioning

confidence: 99%

“…Soil heterotrophic respiration could respond differently to precipitation changes with autotrophic respiration (Huang et al, ; Liu, Liu, et al, ; Lu et al, ). For example, Huang et al () found throughfall exclusion reduced soil heterotrophic respiration but increased autotrophic respiration in the dry season. In a moist tropical forest, Davidson, Ishida, and Nepstad () found soil respiration did not change after throughfall exclusion, mainly due to the counteracting effects of fine root death and consequent enhanced microbial activity.…”

Section: Discussionmentioning

confidence: 99%

“…According to the source of C, soil respiration can be divided into several components (i.e., root respiration, soil microbial respiration, litter respiration), which are essentially driven by the metabolism of plants and soil decomposers (Hanson, Edwards, Garten, & Andrews, 2000;Kuzyakov, 2006;Kuzyakov & Larionova, 2005). Soil respiration is generally well correlated with root biomass (e.g., Huang et al, 2018;Wang, Yang, & Zhang, 2006), soil microbial biomass (e.g., Lee & Jose, 2003;Zhao, Wang, Cao, Zhao, & Gadow, 2018), and litter decomposition rates (e.g., Bowden, Nadelhoffer, Boone, Melillo, & Garrison, 1993;Wang, Yu, He, & Wang, 2017). In a subtropical forest, Jiang et al (2013) showed that the variation of soil respiration responses to double annual precipitation between dry and wet seasons was coupled with the changes of fine root biomass and soil microbial biomass.…”

Section: Introductionmentioning

confidence: 99%

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Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest

Chen

et al. 2019

Ecology and Evolution

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Precipitation is projected to change intensity and seasonal regime under current global projections. However, little is known about how seasonal precipitation changes will affect soil respiration, especially in seasonally dry tropical forests. In a seasonally dry tropical forest in South China, we conducted a precipitation manipulation experiment to simulate a delayed wet season (DW) and a wetter wet season (WW) over a three-year period. In DW, we reduced 60% throughfall in April and May to delay the onset of the wet season and irrigated the same amount water into the plots in October and November to extend the end of the wet season. In WW, we irrigated 25% annual precipitation into plots in July and August. A control treatment (CT) receiving ambient precipitation was also established. Compared with CT, DW significantly increased soil moisture by 54% during October to November, and by 30% during December to April. The treatment of WW did not significantly affect monthly measured soil moisture. In 2015, DW significantly increased leaf area index and soil microbial biomass but decreased fine root biomass. In contrast, WW significantly decreased fine root biomass and forest floor litter stocks. Soil respiration was not affected by DW, which could be attributed to the increased microbial biomass offsetting the decrease in fine root biomass. In contrast, WW significantly increased soil respiration from 3.40 to 3.90 μmol m −2 s −1 in the third year, mainly due to the increased litter decomposition and soil pH (from 4.48 to 4.68). The present study suggests that both a delayed wet season and a wetter wet season will have significant impacts on soil respiration-associated ecosystem components. However, the ecosystem components can respond in different directions to the same change in precipitation, which ultimately affected soil respiration. K E Y W O R D S climate change, precipitation regime, rainfall change, soil CO 2 , tropics S U PP O RTI N G I N FO R M ATI O N Additional supporting information may be found online in the Supporting Information section. How to cite this article: Yu S, Mo Q, Chen Y, et al. Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest. Ecol Evol. 2020;10:467-479.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest

Chen

et al. 2019

Ecology and Evolution

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“…in this region. The low elevation broad‐leaved forests are dominated by Castanopsis carlesii and Castanopsis eyrie, which account for 78% of overstory basal area, while high elevation coniferous forests are dominated by Pinus tanwanensis and Cunninghamia lanceolata , which account for 85% of overstory basal area (Figure S1a; Bu et al, ; Huang et al, ). These forests appear to have been stable for centuries, were protected from disturbance after establishment of the national park and are the result of natural processes of mortality and regeneration.…”

Section: Methodsmentioning

confidence: 99%

Litter quality and site characteristics interact to affect the response of priming effect to temperature in subtropical forests

et al. 2019

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Forest litter inputs to soil can stimulate the decomposition of older soil organic matter (SOM) via a priming effect (PE). The magnitude and underlying mechanisms driving PE are poorly understood, with especially little know about how litter quality and site conditions affect PE in situ. Further, very few studies have examined PE in tropical and subtropical soils. Here, we established low and high elevation sites (600 vs. 1,400 m a.s.l.) in the subtropical Wuyishan National Park, China, that differed with respect to mean annual temperature (MAT; ∆MAT = 4.2°C), vegetation, soil texture and soil moisture. We conducted a 1‐year field incubation study at these two sites to compare PE induced by adding low‐ and high‐quality 13C‐labelled leaf litter to soils. At the low elevation site, additions of high‐quality (low C/N) litter caused a PE that was 140% greater than the PE observed following additions of low‐quality (high C/N) litter. In contrast, we saw no significant differences in PE between litter types at the high elevation site, perhaps because PE was not limited by substrate quality at this cooler, finer textured and higher soil moisture coniferous site. In addition, we found a negative relationship between home‐field advantage (HFA) for litter decomposition and PE, indicating that specialized litter decomposer community driving HFA may not accelerate SOM decomposition via PE in the same way. In line with our observed strong relationship between PE and the efficiency of priming (PE size per unit of mineralized litter C), PEs induced by the high‐ and low‐quality litters were directed to microbial phosphorus (P) mining rather than nitrogen (N) mining. This interpretation aligns with observed increases in the activity of P acquiring extracellular enzymes, often described as phosphatases (P‐tases), as well as the positive relationship between the PE, P‐tase activity and the activity of C acquiring extracellular enzymes. Overall, this PE study across two contrasting sites highlights the important role of site characteristics and litter quality in regulating PE size. Further, we suggest that MAT may be a dominant driver of soil priming, through both the direct effects of litter quantity on labile substrate supply and the indirect effects of litter quality changes on downstream decomposer communities. A free Plain Language Summary can be found within the Supporting Information of this article.

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Drought differentially affects autotrophic and heterotrophic soil respiration rates and their temperature sensitivity

2019

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Autotrophic and heterotrophic soil respiration responds asymmetrically to drought in a subtropical forest in the Southeast China

Cited by 55 publications

References 56 publications

Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest

Effects of seasonal precipitation change on soil respiration processes in a seasonally dry tropical forest

Litter quality and site characteristics interact to affect the response of priming effect to temperature in subtropical forests

Drought differentially affects autotrophic and heterotrophic soil respiration rates and their temperature sensitivity

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