桂林会仙喀斯特湿地芦苇群落土壤微生物数量动态分析

发布时间：2018-03-28 07:43

本文选题：喀斯特湿地　切入点：细菌　出处：《广西植物》2017年06期

【摘要】：以广西桂林会仙喀斯特湿地典型芦苇植物群落为研究对象,于春、夏、秋、冬四个季节分别采集0~10cm,10~20 cm和20~30 cm不同层次的土壤样品,分析根际微生物与非根际微生物的数量特征及季节动态变化特点,探讨微生物数量对水热季节变化的响应规律。结果表明:不同季节的根际微生物与非根际微生物组成,均以细菌占绝对优势;微生物数量分布大小顺序为细菌放线菌真菌,细菌最高比例为96.62%,放线菌最高比例为35.38%,真菌的比例较低,最高仅为0.30%。细菌,真菌和放线菌的垂直变化明显,均随着土层的增加而呈现递减的趋势。不同土壤层次根际微生物与非根际微生物的季节变化一致,细菌数量表现为夏季秋季春季冬季,真菌数量表现为秋季夏季春季冬季,放线菌数量表现为秋季春季夏季冬季;细菌、放线菌、真菌的最大值分别为2.70×10~7、1.92×10~6、3.35×10~4cfu·g~-1,土壤微生物数量与土壤有机碳、全氮、全磷、全钾、速效氮、速效磷、速效钾等呈显著正相关。芦苇植物群落根际土壤微生物呈现出一定的根际效应,并与微生物数量、土壤深度、月平均降雨量和月平均气温变化等有关,而在冬季的根际效应则表现不显著。土壤养分含量是调节会仙喀斯特湿地土壤微生物数量变化的一个主要因素。
[Abstract]:The typical Reed plant communities in Huixian karst wetland in Guilin, Guangxi were studied. Soil samples of different layers were collected in spring, summer, autumn and winter at different levels of 0 ~ 10 cm ~ (10) cm ~ (10) ~ (20) cm and 20 ~ (30) cm respectively. The quantitative and seasonal dynamic characteristics of rhizosphere and non-rhizosphere microbes were analyzed, and the response of microbial quantity to the seasonal variation of water and heat was discussed. The results showed that the composition of rhizosphere and non-rhizosphere microbes in different seasons. The order of distribution of microbes is actinomycetes, the highest proportion of bacteria is 96.62, the highest proportion of actinomycetes is 35.38, the proportion of fungi is lower, the highest is only 0.30.The vertical changes of bacteria, fungi and actinomycetes are obvious. The seasonal variation of rhizosphere microbes and non-rhizosphere microbes in different soil layers was the same. The number of bacteria was summer, autumn, spring and winter, and the number of fungi was autumn, summer, spring and winter. The maximum values of bacteria, actinomycetes and fungi were 2.70 脳 10 ~ (7) (1.92 脳 10 ~ (10)) ~ (6) C ~ (-1) 脳 10~4cfu ~ (-1) 路g ~ (-1) ~ (-1), soil microbial count and soil organic carbon, total nitrogen, total phosphorus, total potassium, available nitrogen, available phosphorus, total phosphorus, total potassium, available nitrogen and available phosphorus, respectively. There was a significant positive correlation between available potassium and so on. The rhizosphere microbes of Reed community showed a certain rhizosphere effect, which was related to the number of microbes, soil depth, monthly average rainfall and monthly mean temperature. However, the rhizosphere effect in winter was not significant, and the soil nutrient content was one of the main factors to regulate the change of soil microbial quantity in Huixian Karst Wetland.
【作者单位】：广西喀斯特植物保育与恢复生态学重点实验室广西壮族自治区中国科学院广西植物研究所;
【基金】：广西林业科技项目(桂林科字[2013]第14号) 广西科技攻关计划项目(桂科攻14124004-3-5,桂科重1598014-3) 广西喀斯特植物保育与恢复生态学重点实验室基金(16-380-32) 广西植物研究所基本业务费项目(桂植业16005) 国家自然科学基金(41361057,31360202) 岩溶动力学重点实验室基金(KDL2011-09) 广西自然科学基金(2013GXNSFEA053001)~~
【分类号】：S154.3

【相似文献】