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首页> 外文期刊>Forests >Effects of Warming and Nitrogen Addition on the Soil Bacterial Community in a Subtropical Chinese Fir Plantation
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Effects of Warming and Nitrogen Addition on the Soil Bacterial Community in a Subtropical Chinese Fir Plantation

机译：亚热带杉木人工林增温增氮对土壤细菌群落的影响

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摘要

Soil warming has the potential to alter bacterial communities, affecting carbon (C) storage and nitrogen (N) cycling in forest ecosystems. We studied bacterial community changes by warming soil and adding two N-levels (40 and 80 kg N ha ?1 year ?1 ) for two years in a subtropical plantation of Chinese fir ( Cunninghamia lanceolate (Lamb.) Hook) in southern China. Soil warming significantly changed the bacterial community structure, causing decreases in Proteobacteria and Acidobacteria, while increasing Actinobacteria and Chloroflexi. The high N addition had a greater impact on the bacterial community structure than the low N addition. Warming shifted the bacterial community towards oligotrophic taxa, while N addition could dilute this tendency. Results of the ecological networks indicated that warming resulted in a more complicated co-occurrence network and an increased interaction between different phylum communities, while N addition enhanced the cooperation within communities pertaining to the same phylum. The changes to the soil properties, typical catabolism enzymes, and plant growth also showed that soil warming and N addition accelerated the C and N cycles in the soil, and lead to an increased upward flow of N (from underground to aboveground) and decomposition rate of soil organic carbon (SOC). Overall, the results provided insights into the bacterial community and soil C and N cycling change at a subtropical plantation.
机译：土壤变暖有可能改变细菌群落，影响森林生态系统中的碳（C）储存和氮（N）循环。我们研究了土壤变暖并在中国南方的亚热带杉木杉（杉木针形林）中添加了两个氮水平（分别为40和80千克N公顷？1年？1），为期两年。土壤变暖显着改变了细菌群落结构，导致变形杆菌和酸性细菌减少，而放线菌和绿弯曲菌增加。高氮添加比低氮添加对细菌群落结构的影响更大。变暖使细菌群落向贫营养类群转移，而氮的添加可以减轻这种趋势。生态网络的结果表明，变暖导致更复杂的共生网络，并增加了不同门类群落之间的相互作用，而氮的添加增强了属于同一门类的群落之间的合作。土壤性质，典型的分解代谢酶和植物生长的变化也表明，土壤变暖和氮的添加加速了土壤中的碳和氮循环，并导致氮（从地下到地上）的向上流动和分解速率增加。土壤有机碳（SOC）。总体而言，结果提供了对亚热带人工林细菌群落以及土壤碳和氮循环变化的见解。

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