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Forests
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Soil Respiration and Carbon Stocks in Tropical Forests
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Soil Respiration and Carbon Stocks in Tropical Forests

A special issue of Forests (ISSN 1999-4907). This special issue belongs to the section "Forest Soil".

Deadline for manuscript submissions: closed (10 December 2021) | Viewed by 5546

Special Issue Editor

Dr. Megan E. McGroddy

E-Mail Website
Guest Editor
NASA Goddard Space Flight Center, Greenbelt, MD 20706, USA
Interests: ecosystem ecology; climate change; tropical forests; biogeochemistry; nutrient cycling; ecosystem functioning; carbon sequestration

Special Issue Information

Dear Colleagues,

Soil respiration is a key component of the terrestrial carbon cycle and yet, because belowground processes are inherently more difficult to analyze, it is one of the less well-characterized components of the carbon cycle. Drivers including temperature, precipitation, and carbon and nutrient pools have been shown to affect both the heterotrophic and autotrophic components of soil respiration. There has been much attention paid to the impact of a warming climate on soil respiration and other carbon fluxes from soils to the atmosphere in the boreal regions. In the tropics, where temperatures are already significantly warmer, less is known about how respiration will respond to warming and changes in the distributions and amount of precipitation.

In this Special Issue, we are hoping to build a collection of work on soil respiration across a variety of tropical ecosystems. We encourage submissions ranging in scale from the plot level to more regional and pan-tropical analyses and covering both experimental and observational approaches. By bringing together a variety of papers on this topic, we hope to inspire collaboration and further discussion on how to improve our understanding of the drivers of soil respiration and potential implications of climate change for both carbon fluxes from soils and carbon pools held with soils in tropical regions.

Dr. Megan E. McGroddy
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Forests is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • soil respiration
  • tropical ecosystems
  • carbon cycling
  • heterotrophic respiration
  • soil carbon pools

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Published Papers (2 papers)

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Research

14 pages, 3418 KiB  
Article
Characteristics of Soil Respiration and Its Components of a Mixed Dipterocarp Forest in China
by Jun-Fu Zhao, Zhi-Yong Liao, Lian-Yan Yang, Jian-Kang Shi and Zheng-Hong Tan
Forests 2021, 12(9), 1159; https://doi.org/10.3390/f12091159 - 27 Aug 2021
Cited by 5 | Viewed by 2616
Abstract
Background: Although numerous studies have been carried out in recent decades, soil respiration remains one of the less understood elements in global carbon budget research. Tropical forests store a considerable amount of carbon, and a well-established knowledge of the patterns, components, and controls [...] Read more.
Background: Although numerous studies have been carried out in recent decades, soil respiration remains one of the less understood elements in global carbon budget research. Tropical forests store a considerable amount of carbon, and a well-established knowledge of the patterns, components, and controls of soil respiration in these forests will be crucial in global change research. Methods: Soil respiration was separated into two components using the trenching method. Each component was measured at multiple temporal scales and in different microhabitats. A commercial soil efflux system (Li8100/8150) was used to accomplish soil respiration monitoring. Four commonly used models were compared that described the temperature dependence of soil heterotrophic respiration using nonlinear statistics. Results and Conclusions: Trenching has a limited effect on soil temperature but considerably affects soil water content due to the exclusion of water loss via tree transpiration. Soil respiration decreased gradually from 8 to 4 μmol·m−2·s−1 6 days after trenching. Soil autotrophic (Ra) and heterotrophic respiration (Rh) have contrasting diel patterns and different responses to temperature. Rh was negatively correlated with temperature but positively correlated with relative humidity. Both Ra and Rh varied dramatically among microhabitats. The Q10 value of Rh derived using the Q10 model was 2.54. The Kirschbaum–O’Connell model, which implied a strong decrease of Q10 with temperature, worked best in describing temperature dependence of Rh. Heterotrophic respiration accounted for nearly half of the total soil efflux. We found an unexpected diurnal pattern in soil heterotrophic respiration which might be related to diurnal moisture dynamics. Temperature, but not soil moisture, was the major controller of seasonal variation of soil respiration in both autotrophic and heterotrophic components. From a statistical perspective, the best model to describe the temperature sensitivity of soil respiration was the Kirschbaum–O’Connell model. Soil respiration varied strongly among the microhabitats and played a crucial role in stand-level ecosystem carbon balance assessment. Full article
(This article belongs to the Special Issue Soil Respiration and Carbon Stocks in Tropical Forests)
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13 pages, 1888 KiB  
Article
Soil Respiration Variation among Four Tree Species at Young Afforested Sites under the Influence of Frequent Typhoon Occurrences
by Po-Neng Chiang, Jui-Chu Yu and Yen-Jen Lai
Forests 2021, 12(6), 787; https://doi.org/10.3390/f12060787 - 15 Jun 2021
Cited by 3 | Viewed by 2278
Abstract
Afforestation is an effective solution for restoring forest ecosystems and mitigating climate change in the tropics. In this study, we analyzed the soil respiration (Rs) at four afforested sites with different tree species exposed to a monsoon climate with frequent typhoon occurrences in [...] Read more.
Afforestation is an effective solution for restoring forest ecosystems and mitigating climate change in the tropics. In this study, we analyzed the soil respiration (Rs) at four afforested sites with different tree species exposed to a monsoon climate with frequent typhoon occurrences in southern Taiwan. The aim of this study is to examine (1) the distinct seasonal variation that strongly affects the Rs among four tree species at afforested sites, (2) the patterns of Rs that differ among the four species at the afforested sites, and (3) the influence of typhoons on forest structure and consequently the degree of Rs. The annual mean Rs among the four tree species at the afforested sites in the pretyphoon disturbance year was approximately 7.65 t C ha−1, with the post-typhoon year having an annual mean Rs of approximately 9.13 t C ha−1. Our results clearly show Rs variations in the four tree species at the young afforested sites under the influence of typhoon disturbances. The high seasonal variations in Rs were controlled by soil temperature and soil moisture. The different tree species also led to variations in litterfall production and consequently influenced Rs variation. Forest structures, such as aboveground biomass and consequently the degree of Rs, were disturbed by severe typhoon impacts in 2016, resulting in high aboveground biomass with tree height losses and litterfall accumulation. Furthermore, Rs increased immediately after litterfall input to the soil, and the addition effect of litter and the soil C release occurred throughout the year after typhoon disturbances. Our results contribute to understanding impact of typhoon disturbances on the degree of Rs at tropical afforested sites. Full article
(This article belongs to the Special Issue Soil Respiration and Carbon Stocks in Tropical Forests)
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