|Table of Contents|

Effect of acid deposition on the key processes in the carbon cycle of forest ecosystems: a review(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2021 03
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Effect of acid deposition on the key processes in the carbon cycle of forest ecosystems: a review
WANG Jiao1 3 GUAN Xin1 2 HUANG Ke1 2 ZHU Munan1 2 SU Xiujiang4 & YANG Qingpeng1 2?
1 CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China 2 Huitong National Research Station of Forest Ecosystem of Chinese Academy of Sciences, Hunan Key Laboratory for Structure and Ecosystem Service of Subtropical Forest, Huitong 418307, China 3 College of Resources?and?Environment, University of Chinese Academy of Sciences, Beijing 101408, China 4 Baiyunshan National Nature Reserve Administration, Baojing 416500, China
acid deposition forest ecosystem forest tree growth photosynthesis litter soil respiration soil organic carbon

With rapid economic development and energy consumption, acid deposition has become increasingly serious in China. Acid deposition can cause a series of environmental problems, such as vegetation degradation and soil acidification. Therefore, increasing attention is being paid to the harmful effects of acid deposition. The forest ecosystem is one of the most important ecosystems in the world that is profoundly affected by acid deposition. In this study, we reviewed the influence of acid deposition on the key processes in the carbon cycle of forest ecosystems and their possible mechanisms. (1) Acid deposition influences leaf photosynthesis by altering chlorophyll content, stomatal conductance, and enzymatic activity. Photosynthetic activity is related to the severity and type of acid deposition. (2) The biomass of forest vegetation is altered by acid deposition through direct damage to the leaf structure and indirect effects on soil acidification. Acid deposition usually inhibits tree growth, but it varies with the severity and type of acid deposition. (3) Acid deposition influences the litter decomposition rate by altering soil enzyme activity and microbial composition, and the degree and direction of the acid deposition effect are related to the soil buffering capacities and the type of acid deposition. (4) The effect of acid deposition on soil respiration (Rs) is regulated by various factors, including root biomass, microorganisms, enzyme activity, and temperature. The different components of Rs (autotrophic and heterotrophic respiration) may respond differently to acid deposition. (5) In general, acid deposition reduces dissolved organic carbon levels, microbial activity, and microbial biomass and, thus, contributes to soil organic carbon accumulation and stabilization. Finally, based on the uncertainties surrounding the response of forest ecosystem carbon dynamics to acid deposition, four directions were proposed for consideration in future research: (1) comparison of the effects on forest ecosystems between dry and wet acid deposition; (2) the response of other ecological processes, including stem respiration and belowground carbon allocation, to acid deposition; (3) the effects of the coupling of acid deposition and other environmental change factors on forest ecosystems; and (4) the long-term effect of acid deposition on the carbon cycle of forest ecosystems.


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