Changes in soil microbial community structure and function after afforestation depend on species and age: Case study in a subtropical alluvial island
Changes in soil microbial community structure and function after afforestation depend on species and age: Case study in a subtropical alluvial island
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造林后土壤微生物群落结构和功能的变化取决于物种和年龄：亚热带冲积岛的案例研究
DOI：
10.1016/j.scitotenv.2017.12.180
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发表时间：
2018-06-01
影响因子：
9.8
通讯作者：
Ning, Mulei
中科院分区：
文献类型：
--
作者：
Kang, Hongzhang;Gao, Huanhuan;Ning, Mulei
众所周知，土地利用变化会对土壤理化性质产生深远的影响，但对土壤微生物群落的相关变化知之甚少。我们在中国东部的亚热带冲积岛屿上进行了长期的研究，以测量土壤理化性质和微生物群落丰度和组成的变化（通过磷脂脂肪酸（PLEA）分析）和功能（通过胞外酶活性）在同一土壤基质上开发的不同土地利用类型，包括樟脑（Cinnainomum aimphorci）种植园、不同年龄的黎明红杉（Metusequoia glyptastroboides）种植、砍伐林地和稻田的时序。我们假设造林可以通过提高碳（C）和氮（N）含量，微生物生物量和酶活性来改善土壤质量，但这种效果会因林龄和树种而异。老人工林土壤C、N含量、PLEA丰度和分解酶（0-葡萄糖苷酶、脲酶、碱性磷酸酶和过氧化氢酶）活性均显著高于农田。与耕地相比，这些变量在毁林土地上变化不大或有所减少。这些变量也增加了种植年龄在黎明红杉种植。樟树人工林土壤养分含量、微生物生物量和酶活性均高于同龄的红红壤。土壤化学和生物学性质之间存在显著的相关关系：土壤PLEA丰度与土壤有机质含量呈正相关，真菌/细菌比和真菌相对丰度与土壤有机质含量呈正相关，与C/N呈负相关，土壤PLEA丰度和酶活性与土壤无机氮含量和潜在净氮矿化率呈正相关，土壤PLEA丰度和酶活性与土壤有机质含量呈正相关，与土壤C/N呈负相关。不同土地利用类型的碳、氮、磷吸收比例为10：1：10。我们的研究强调了这样一个事实，即土地利用类型可以对土壤微生物群落产生深远的影响;此外，树种和种植年龄也在造林中发挥重要作用。(C)2017爱思唯尔B. V.保留所有权利。
It is well established that land use change can have a profound impact on soil physicochemical properties but the associated changes in soil microbial communities are poorly understood. We used long-term research sites in a subtropical alluvial island of eastern China to measure changes in soil physicochemical properties and microbial community abundance and composition (via phospholipid fatty acid (PLEA) analysis) and function (via extracellular enzyme activity) across different land use types developed on the same soil matrix, including a camphor (Cinnainomum aimphorci) plantation, a chronosequence of differently aged dawn redwood (Metusequoia glyptastroboides) plantings, a deforested land and a rice paddy. We hypothesized that afforestation could improve soil quality by enhancing carbon (C) and nitrogen (N) contents, microbial biomass and enzyme activities, but that this effect would vary depending on forest age and tree species. Soil C and N concentrations, PLEA abundances and activities of decomposition enzymes (0-glucosidase, urease, alkaline phosphatase and catalase) in older plantations all increased significantly compared to cropland. These variables changed little or decreased in deforested land compared to cropland. These variables also increased with planting age in the dawn redwood plantings. Soils under camphor plantations had higher soil nutrient contents, microbial biomass and lower enzyme activities than dawn redwood soils with similar age. We also found some significant relationships between soil chemical and biological properties: PLEA abundances were positively related to soil organic matter (SOM) contents; the fungal-to-bacterial ratio and fungal relative abundance were correlated positively with SOM contents and negatively with C/N ratio; both soil PLEA abundances and enzyme activities were positively linked with soil inorganic N content and potential net N mineralization rate; ratio of specific C, N and P (phosphorus) acquisition activities was limited to 10: 1: 10 across land use types. Our study underscores the fact that land use type can have a profound impact on soil microbial communities; in addition, tree species and planting age also play significant roles in afforestation. (C) 2017 Elsevier B.V. All rights reserved.