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| 桂北不同林龄桉树人工林土壤微生物数量和酶活性特征研究 |
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段春燕1,2,5, 何成新2,5, 沈育伊3, 滕秋梅2,徐广平2,5*, 罗亚进4,
周龙武2, 顾大形2, 何 文2, 黄科朝2
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1. 广西师范大学 珍稀濒危动植物生态与环境保护教育部重点实验室, 广西 桂林 541006;2. 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, 广西 桂林 541006;3. 广西植物功能物质研究与利用重点实验室,
广西壮族自治区
中国科学院 广西植物研究所, 广西 桂林 541006;4. 广西雅长兰科植物国家级自然保护区管理中心,
广西 百色 533209;5. 广西师范大学 生命科学学院, 广西 桂林 541006
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| 摘要: |
| 为探讨桉树不同林龄土壤微生物活性的响应特征,该研究采用时空互代法,选择广西北部低山丘陵地区1～5年生桉树人工林为研究对象,分析了土壤微生物、酶活性在不同土层和季节的变化规律。结果表明:(1)土壤微生物和酶活性在土层中有明显的垂直分布特征,均随土层加深而趋于降低,且各土层间差异显著。(2)细菌、放线菌数量随季节的大小顺序为秋季>夏季>春季>冬季,真菌的变化规律为春季>夏季>秋季>冬季,而酶活性随季节变化表现为夏季、秋季活性较高,春季、冬季活性较低。(3)细菌、真菌、脲酶、过氧化氢酶随林龄增大表现出先减小后增大的趋势,放线菌则呈现先减小后增大再减小的趋势,而蔗糖酶、酸性磷酸酶随林龄的增大趋于增大。(4)林地土壤中三大类群微生物与四种土壤酶之间存在极显著正相关关系,说明土壤微生物与土壤酶活性相互影响,两者之间关系密切,共同影响土壤的质量。综上可知,不同土层土壤微生物和酶活性的季节响应特征差异较大,总体在冬季最低,主要与气温、水分条件、凋落物养分的归还等有关。不同季节、土层、林龄之间的交互作用对土壤微生物和酶活性有显著影响。 |
| 关键词: 桉树人工林, 土壤微生物, 土壤酶活性, 林龄, 季节 |
| DOI：10.11931/guihaia.gxzw201903019 |
| 分类号:Q948 |
| 文章编号:1000-3142(2020)12-1877-12 |
| Fund project:国家自然科学基金(31760162,41361057); 广西喀斯特植物保育与恢复生态学重点实验室基金(17-259-23); 广西自然科学基金(2018GXNSFAA050069,2017GXNSFBA198037); 广西科技攻关计划项目(桂科攻1598016-12); 广西科技重大专项项目(桂科AA18118028,桂科AB18126065); 广西植物研究所基本业务费项目(17012,18007,18015); 广西百色高新技术产业开发区引导项目(K-YS-SW-201801)[Supported by the National Natural Science Foundation of China(31760162, 41361057); the Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain(17-259-23); the Natural Science Foundation of Guangxi(2018GXNSFAA050069, 2017GXNSFBA198037); the Science and Technology Program of Guangxi(1598016-12); Science and Technology Major Project of Guangxi(AA18118028, AB18126065); the Fundamental Research Fund of Guangxi Institute of Botany(17102, 18007, 18015); the Pilot-Project of Guangxi Baise High-Tech Industrial Development Zone(K-YS-SW-201801)]。 |
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| Soil microbe quantity and enzyme activity characteristics of Eucalyptus plantations of different forest ages in North Guangxi |
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DUAN Chunyan1,2,5, HE Chengxin2,5, SHEN Yuyi3, TENG Qiumei2, XU Guangping2,5*,
LUO Yajin4, ZHOU Longwu2, GU Daxing2, HE Wen2, HUANG Kechao2
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1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University), Ministry of Education,
Guilin 541006, Guangxi, China;2. Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of
Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China;3. Guangxi Key Laboratory of
Functional Phytochemicals Research and Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of
Sciences, Guilin 541006, Guangxi, China;4. Administration Center of Yachang Orchid National Nature Reserve, Baise 533209, Guangxi,
China;5. College of Life Sciences, Guangxi Normal University, Guilin 541006, Guangxi, China
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| Abstract: |
| To study the characteristics of soil microbial activity of different forest age of Eucalyptus, using the space-time intergenerational method, we studied the variations characteristics of soil microbes and enzyme activities from four soil depths(0-10, 10-20, 20-30 and 30-40 cm)of different forest ages of Eucalyptus plantations(1, 2, 3, 4, 5 a)at the hilly areas in North Guangxi. The results were as follows:(1)In the soil layers, soil microbial and enzyme activities had obvious vertical distribution characteristics. Both microbial contents and enzyme activities decreased with the deepening of the soil layer, with significant differences among the soil layers.(2)The order of bacteria and actinomycetes contents were autumn > summer > spring > winter, the variation tendency of fungi was spring > summer > autumn > winter, and the enzyme activity changed with season differently, which was higher in summer and autumn, and lower in spring and winter.(3)The soil bacteria, fungi, urease and catalase in the Eucalyptus plantations showed a trend of decreasing first and then increasing with the increase of forest ages, and actinomycetes decreased, increased and then decreased. The activities of invertase and acid phosphatase all increased with the increase of forest ages.(4)There was the significant correlation between the soil microbes and the soil enzymes, indicating that the interaction between soil microbes and soil enzymes had a close relationship, both of which affected the quality of the soil. The seasonal changes of soil microbes and enzyme activities were different in soil layers, which was the lowest in the winter and was mainly related to temperature, water condition and nutrient return of litter and so on. The interactions between different seasons, soil layers and forest ages had significant effects on soil microbes and enzyme activities. |
| Key words: Eucalyptus plantations, soil microbe, soil enzyme activity, forest age, season |
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