Relative importance of soil microbes and litter quality on decomposition and nitrogen cycling in grasslands
Relative importance of soil microbes and litter quality on decomposition and nitrogen cycling in grasslands
复制标题
土壤微生物和凋落物质量对草地分解和氮循环的相对重要性
DOI：
10.1111/1440-1703.12163
复制
发表时间：
2020
影响因子：
2
通讯作者：
Hossain Zabed and Sugiyama Shuichi
中科院分区：
文献类型：
--
作者：
Wang Boxi and Sugiyama Shuichi;Hossain Zabed and Sugiyama Shuichi
微生物分解者在凋落物分解过程中吸收氮(N)以维持生长，将多余的N释放到土壤中。氮的释放(矿化)和吸收(固定)之间的平衡可以改变养分循环，主要基于微生物群落的功能多样性。通过微观世界研究，研究了土壤微生物和凋落物质量对人工草地和两个半自然草地氮素循环的影响。与半天然草地土壤相比，人工草地土壤具有较高的呼吸速率和较低的氮矿化速率，而与培养过程中的凋落物特性无关。由于土壤微生物在分解过程中吸收了大部分矿化氮，人工草地凋落物矿化氮的释放量较小。人工草地土壤的菌菌比低(即细菌丰度高)，细菌和真菌群落与半天然草地土壤明显分离。我们的结果表明，在草地地上和地下群落之间的N循环中，起关键作用的是微生物分解者的化学计量限制，而不是生物量周转率。
Microbial decomposers absorb nitrogen (N) to sustain growth during litter decomposition releasing surplus N into the soil. The balance between N release (mineralization) and absorption (immobilization) can alter nutrient cycling based mostly on the functional diversity in microbial communities. We examined the effects of soil microbes and litter quality on N cycling in an artificial grassland and two seminatural grasslands through a microcosm study. The artificial grassland soil had a higher respiration rate and a lower N mineralization rate, irrespective of the litter identity during incubation, when compared with the seminatural grassland soil. The release of mineralized nitrogen from litter was small for the artificial grassland because the soil microbes absorbed most of the mineralized N during decomposition. The artificial grassland soil had a low fungi:bacteria ratio (i.e., a high abundance of bacteria) and showed a clear separation of bacterial and fungal communities from the seminatural grassland soil. Our results suggested that stoichiometric constraint, not the biomass turnover rate, of microbial decomposers plays a key role in N cycling between aboveground and belowground communities in grasslands.
影响因子：
8.8
作者：
Bever JD;Broadhurst LM;Thrall PH
通讯作者：
Thrall PH
土壤微生物群落结构分析分子指纹图谱方法比较
DOI：
--
发表时间：
2009
期刊：
Ecological Research 24
影响因子：
--
作者：
Tani;H.;水谷玲菜;水谷玲菜;Atsushi Okubo
通讯作者：
Atsushi Okubo