Responses of Soil Microbial Community Structure and Potential Mineralization Processes to Solidago canadensis Invasion
Responses of Soil Microbial Community Structure and Potential Mineralization Processes to Solidago canadensis Invasion
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DOI：
10.1097/ss.0b013e318258f11e
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发表时间：
2012-07
期刊：
影响因子：
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通讯作者：
Weihua Li;Chong-bang Zhang;C. Peng
中科院分区：
文献类型：
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作者：
Weihua Li;Chong-bang Zhang;C. Peng
摘要 加拿大一枝黄花是我国东部地区的一种有毒入侵杂草。目前尚不清楚其入侵如何影响土壤微生物群落结构和矿化过程。因此，在中国浙江省的五个野外区域测量了微生物群落结构（通过磷脂脂肪酸[PLFA]评估）和与其入侵相关的潜在矿化过程。一枝黄花侵染土壤中细菌、真菌、放线菌、两个功能群（即革兰氏阴性菌和菌根）的磷脂脂肪酸丰度以及革兰氏阴性/阳性细菌PLFA和真菌/细菌PLFA的两个比值均显着高于原生土壤（P < 0.05），而cy17:0/16:17比值则降低（P < 0.05）。 0.05）。一枝黄花入侵后，氨化作用、纤维素作用和有机磷矿化作用也分别显着增加，但硝化作用显着下降（P < 0.05）。 PLFA 数据集的主成分分析清楚地区分了原生地块和入侵地块。蒙特卡洛排列检验的冗余分析表明，一些 PLFA，如 10:0、12:0、cy17:0、cy19:0、16:17、18:19、18:17、18:26、16:15、10Me18:0、10ME17:0、10Me16:0、17:18 和18:0 与氨化、硝化、纤维素和有机磷分解速率密切相关。这些结果表明，入侵引起的土壤微生物群落结构和养分转化过程的变化（特别是硝化抑制和氨化促进）可能是一枝黄花在入侵生态系统中与本地物种竞争土壤养分时占据主导地位的原因之一。
Abstract Solidago canadensis is a noxious invasive weed of Eastern China. It is still unclear how its invasion affects the soil microbial community structure and mineralization processes. Therefore, the microbial community structure (assessed by phospholipid fatty acid [PLFA]) and potential mineralization processes associated with its invasion were measured in five field areas in Zhejiang Province, China. Phospholipid fatty acid abundances of bacterial, fungal, actinomycete, two function groups (i.e., Gram-negative bacteria and mycorrhizae), and two ratios for Gram-negative/positive bacterial PLFAs and fungal/bacterial PLFAs were significantly higher in soils invaded by Solidago than in the native soil (P < 0.05), whereas the ratio cy17:0/16:17 decreased (P < 0.05). Ammonification, cellulose, and organic phosphorus mineralization also significantly increased following the invasion of Solidago, respectively, but the nitrification significantly decreased (P < 0.05). Principal components analysis for the PLFA data sets clearly discriminated the native plots from the invaded plots. Redundancy analysis with Monte Carlo permutation tests showed that some PLFAs such as 10:0, 12:0, cy17:0, cy19:0, 16:17, 18:19, 18:17, 18:26, 16:15, 10Me18:0, 10ME17:0, 10Me16:0, 17:18, and 18:0 were strongly correlated with rates of ammonification, nitrification, and cellulose and organic phosphorus decomposition. These results suggest that the invasion-induced changes in soil microbial community structure and nutrient transformation processes (especially nitrification inhibition and ammonification promotion) may be one of the reasons why Solidago becomes predominant in competition with indigenous species for soil nutrients in the invaded ecosystem.