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首页> 外文期刊>Ecological research >Acid rain decelerates the decomposition of Cunninghamia lanceolata needle and Cinnamomum camphora leaf litters in a karst region in China
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Acid rain decelerates the decomposition of Cunninghamia lanceolata needle and Cinnamomum camphora leaf litters in a karst region in China

机译：酸雨使中国喀斯特地区的杉木针叶和樟树叶片凋落物分解速度减慢

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Acid rain is generally believed to inhibit litter decomposition, but this inhibition effect often depends on local soil environmental factors such as nutrient and physicochemical property. Karst ecosystem is typically characterized by rich CaCO3, which can potentially react with H+ from acid rain. However, it is unknown whether the effect of acid rain on litter decomposition will be mitigated by this potential reaction. To investigate the effect of acid rain on decomposition, we undertook a field experiment on the decomposition of litters of Cunninghamia lanceolata needle and Cinnamomum camphora leaf during 1 year in a karst region in subtropical China. Contrary to hypothesis, litter decomposition was significantly decelerated by acid rain for the two litter types. For C. lanceolata litter, at the end of incubation, we noted that moderate acid rain resulted in the highest loss in mass (43%), while severe one showed the lowest loss (39%); for C. camphora litter, the mass loss was as follows: ambient treatment (66%)moderate treatment (56%)severe treatment (42%). Also microbial activities (including CO2 flux, fungal biomass and microbial degrading enzymes) showed similar variation patterns among acid rain treatments to mass loss. These responses indicated that the deceleration effect of acid rain on litter decomposition did not depend on calcareous soil as well as litter quality. Together, these results suggest that acid rain had a predominant controlling of litter decomposition over soil and litter qualities, and this information may be useful for predicting functional responses of karst ecosystem to environmental factors.
机译：通常认为酸雨会抑制垃圾分解，但是这种抑制作用通常取决于当地的土壤环境因素，例如养分和理化特性。喀斯特生态系统通常以富含CaCO3为特征，CaCO3可能会与酸雨中的H +反应。但是，尚不清楚这种潜在反应是否会减轻酸雨对垃圾分解的影响。为了研究酸雨对分解的影响，我们在亚热带喀斯特地区进行了一年的杉木针叶和樟脑叶凋落物分解的田间试验。与假设相反，两种类型的凋落物因酸雨而明显减速。对于轮叶梭菌，在孵化结束时，我们注意到中度酸雨导致质量损失最高（43％），而严重的酸雨损失最小（39％）；对于樟脑垫料，质量损失如下：环境处理（66％）>中度处理（56％）>重度处理（42％）。同样，微生物活动（包括CO2通量，真菌生物量和微生物降解酶）在酸雨处理过程中也表现出相似的变化模式，即质量损失。这些反应表明，酸雨对凋落物分解的减速作用不取决于石灰性土壤以及凋落物的质量。总之，这些结果表明，酸雨对土壤和垃圾质量的凋落物分解具有主要控制作用，该信息可能有助于预测喀斯特生态系统对环境因素的功能响应。

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