帽儿山地区不同土地利用方式下土壤-微生物-矿化碳氮化学计量特征
发布时间：2018-09-05 11:54
【摘要】：土地利用方式的变化导致土壤碳氮含量及其化学计量关系的变化,然而土壤微生物化学计量及其驱动的碳氮矿化过程如何响应这种变化仍不明确。以帽儿山地区天然落叶阔叶林、人工红松林、草地和农田4种不同土地利用类型为对象,测定其土壤有机碳(C_(soil))、全氮(N_(soil))、微生物生物量碳和氮(C_(mic)和N_(mic))、土壤碳和氮矿化速率(C_(min)和N_(min)),旨在比较不同土地利用方式对土壤、微生物碳氮化学计量特征及矿化速率的影响,探索土壤-微生物-矿化之间碳氮化学计量特征的相关性,揭示微生物对土壤碳氮化学计量变化的响应和调控机制。结果显示:C_(soil)、N_(soil)、C_(mic)、N_(mic)和C_(min)均呈现天然落叶阔叶林人工红松林草地农田,而天然落叶阔叶林和草地的N_(min)显著高于人工红松林和农田。土地利用方式显著影响土壤和微生物碳氮比(C∶N_(soil)和C∶N_(mic)),均呈现农田最高。不同土地利用方式的数据综合分析发现:碳氮矿化速率比与C∶N_(mic)呈负相关,而和微生物与土壤碳氮化学计量不平衡性(C∶N_(imb))显著正相关。单位微生物生物量的碳矿化速率(qCO_2)随着C∶N_(mic)的增加而降低,而单位微生物生物量的氮矿化速率(qAN)随着C∶N_(mic)的增加而增加。C∶N_(imb)与qCO_2正相关,与qAN负相关。以上结果表明,微生物会通过改变自身碳氮化学计量、调整碳氮之间相对矿化速率,以适应土地利用变化导致的土壤碳氮及其化学计量的变异性,以满足自身生长和代谢的碳氮需求平衡。
[Abstract]:The change of land use mode leads to the change of soil carbon and nitrogen content and its stoichiometry. However, it is not clear how soil microbial stoichiometry and its driven carbon and nitrogen mineralization process respond to this change. Four different types of land use, including natural deciduous broad-leaved forest, artificial Korean pine forest, grassland and farmland in Maoershan area, were studied. Soil organic carbon (C _ (soil), total nitrogen) (N _ (soil), microbial biomass carbon and nitrogen (C _ (mic) and N _ (mic),) soil carbon and nitrogen mineralization rates (C _ (min) and N _ (min),) were determined to compare the effects of different land use patterns on soil, microbial carbon and nitrogen stoichiometric characteristics and mineralization rates. To explore the correlation between soil, microorganism and mineralization, and to reveal the response and regulation mechanism of microorganisms to soil carbon and nitrogen stoichiometry. The results showed that the N _ (mic) and C _ (min) of C _ (soil) N _ (mic) N _ (mic) and C _ (min) were both natural deciduous broad-leaved forest and artificial Korean pine forest grassland, while natural deciduous broadleaved forest and grassland had significantly higher N _ (min) than those of artificial Korean pine forest and farmland. Land use patterns significantly affected soil and microbial carbon to nitrogen ratios (C: n _ (soil) and C: n _ (mic), both of which were highest in farmland. The comprehensive analysis of different land use patterns showed that the ratio of carbon and nitrogen mineralization rate was negatively correlated with C: n _ (mic), but positively correlated with microorganism and soil carbon and nitrogen stoichiometric disequilibrium (C: n _ (imb). The carbon mineralization rate (qCO_2) of the unit microbial biomass decreased with the increase of C: n _ (mic), while the nitrogen mineralization rate of the unit microbial biomass increased with the increase of C: n _ (mic). C: n _ (imb) was positively correlated with qCO_2 and negatively correlated with qAN. These results indicate that microbes adjust the relative mineralization rate between carbon and nitrogen by changing their own carbon and nitrogen stoichiometry to adapt to the variability of soil carbon and nitrogen and their stoichiometry caused by land use change. In order to meet their own growth and metabolism of carbon and nitrogen demand balance.
【作者单位】： 东北林业大学生态研究中心;
【基金】：教育部长江学者和创新团队发展计划(IRT_15R09) 国家“十二五”科技支撑项目(2011BAD37B01) 中央高校基本科研业务费专项资金资助项目(2572016AA08)
【分类号】：S154
，
本文编号：2224188
[Abstract]:The change of land use mode leads to the change of soil carbon and nitrogen content and its stoichiometry. However, it is not clear how soil microbial stoichiometry and its driven carbon and nitrogen mineralization process respond to this change. Four different types of land use, including natural deciduous broad-leaved forest, artificial Korean pine forest, grassland and farmland in Maoershan area, were studied. Soil organic carbon (C _ (soil), total nitrogen) (N _ (soil), microbial biomass carbon and nitrogen (C _ (mic) and N _ (mic),) soil carbon and nitrogen mineralization rates (C _ (min) and N _ (min),) were determined to compare the effects of different land use patterns on soil, microbial carbon and nitrogen stoichiometric characteristics and mineralization rates. To explore the correlation between soil, microorganism and mineralization, and to reveal the response and regulation mechanism of microorganisms to soil carbon and nitrogen stoichiometry. The results showed that the N _ (mic) and C _ (min) of C _ (soil) N _ (mic) N _ (mic) and C _ (min) were both natural deciduous broad-leaved forest and artificial Korean pine forest grassland, while natural deciduous broadleaved forest and grassland had significantly higher N _ (min) than those of artificial Korean pine forest and farmland. Land use patterns significantly affected soil and microbial carbon to nitrogen ratios (C: n _ (soil) and C: n _ (mic), both of which were highest in farmland. The comprehensive analysis of different land use patterns showed that the ratio of carbon and nitrogen mineralization rate was negatively correlated with C: n _ (mic), but positively correlated with microorganism and soil carbon and nitrogen stoichiometric disequilibrium (C: n _ (imb). The carbon mineralization rate (qCO_2) of the unit microbial biomass decreased with the increase of C: n _ (mic), while the nitrogen mineralization rate of the unit microbial biomass increased with the increase of C: n _ (mic). C: n _ (imb) was positively correlated with qCO_2 and negatively correlated with qAN. These results indicate that microbes adjust the relative mineralization rate between carbon and nitrogen by changing their own carbon and nitrogen stoichiometry to adapt to the variability of soil carbon and nitrogen and their stoichiometry caused by land use change. In order to meet their own growth and metabolism of carbon and nitrogen demand balance.
【作者单位】： 东北林业大学生态研究中心;
【基金】：教育部长江学者和创新团队发展计划(IRT_15R09) 国家“十二五”科技支撑项目(2011BAD37B01) 中央高校基本科研业务费专项资金资助项目(2572016AA08)
【分类号】：S154
，
本文编号：2224188
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