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Abstract
Accompanying its rapid economic development and population growth, China is the world's third largest acid rain region, following Europe and North America. The effects of acid rain on forest ecosystem were widely researched, including the growth, the nutrient of the leaf and soil, and so on. However, there are few reports about the effects of acid rain on the soil microbial diversity. This study investigated the effects of acid rain on soil microbial community function under potted Masson pine seedlings (Pinus massoniana Lamb). After 7 months of treatment with simulated acid rain, the low acid load treatment (pH 5.5) stimulated soil microbial activity, and increased soil microbial diversity and richness, while the higher levels of acid application (pH 4.5, pH 3.5) resulted in lower soil microbial activity and had no significant effects on soil microbial diversity and richness. Principal component analysis showed that there was clear discrimination in the metabolic capability of the soil microbial community among the simulated acid rain and control treatments. The results obtained indicated that the higher acid load decreased the soil microbial activity and no effects on soil microbial diversity assessed by Biolog of potted Masson pine seedlings. Simulated acid rain also changed the metabolic capability of the soil microbial community.
Highlights
During the past few decades, the impact of acid deposition has been intensively investigated
The average well color development (AWCD) increased with the incubation time (Fig. 1)
The present study showed that a low acid load stimulated soil microbial activity and increased soil microbial community functional diversity and richness indices
Summary
During the past few decades, the impact of acid deposition has been intensively investigated. Acidic loads applied during a short time period, sometimes even in a single load, have been shown to have toxic effects on the soil respiration rate, microbial community structure, and microbial biomass [1,5,6]. Both direct and indirect effects of an increased acid load on the size, composition, and activity of the soil microbes have been reported [1,5,7,8,9,10,11,12,13]. Simulated acid rain changed the metabolic capability of the soil microbial community
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