不同土地利用方式下喀斯特峰丛洼地土壤微生物群落特征

应用生态学报

不同土地利用方式下喀斯特峰丛洼地土壤微生物群落特征

宋敏^1,2,3,邹冬生²,杜虎^1,3,彭晚霞^1,3**,曾馥平^1,3,谭秋锦^1,3,4,范夫静^1,3,5

(¹中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室, 长沙 410125; ^2湖南农业大学生物科学技术学院, 长沙 410128; ^3中国科学院环江喀斯特生态系统观测研究站, 广西环江 547100; ⁴广西大学林学院, 南宁 530004; ⁵江西农业大学, 南昌 330045)

出版日期:2013-09-18 发布日期:2013-09-18

Characteristics of soil microbial populations in depressions between karst hills under different land use patterns.

SONG Min^1,2,3, ZOU Dong-sheng², DU Hu^1,3, PENG Wan-xia^1,3, ZENG Fu-ping^1,3, TAN Qiu-jin^1,3,4, FAN Fu-jing^1,3,5

(¹Key Laboratory of Agroecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; ²College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410125, China; ³Huanjiang Observation and Research Station of Karst Ecosystem, Chinese Academy of Sciences, Huanjiang, Guangxi Zhuang Autonomous Region, Huanjiang 547100, Guangxi, China; ⁴College of Forestry, Guangxi University, Nanning 530004, China; ⁵Jiangxi Agricultural University, Nanchang 330045, China)

Online:2013-09-18 Published:2013-09-18

摘要/Abstract

摘要：

基于对喀斯特峰丛洼地6种土地利用类型(坡耕地、草丛、灌丛、人工林、次生林、原生林)的土壤微生物、养分、矿物质和植被4组变量35个指标的调查分析,研究了不同土地利用方式下土壤微生物种群数量、微生物生物量C、N、P及其分形特征,以及土壤微生物与植被、土壤养分、矿物质的关系.结果表明:不同土地利用方式下喀斯特峰丛洼地的土壤微生物种群数量及组成不同.微生物种群数量均以原生林和坡耕地最高,人工林最低;3种森林土壤的细菌比率较大,坡耕地、草丛、灌丛的放线菌比率较大,真菌的比率均很小;土壤微生物生物量C、N、P的含量均很高,其中原生林最高;土壤微生物生物量碳与土壤微生物种群数量具有良好的分形关系,而土壤微生物生物量氮、磷与种群数量不存在分形关系;土壤微生物与植被、土壤养分、土壤矿物质显著相关,其中土壤微生物生物量碳与乔木层的Shannon指数、土壤速效氮、Fe₂O₃、CaO含量显著相关.

Abstract: Based on the investigation and analysis of six soil microbial indices, eight soil conventional nutrient indices, six soil mineral nutrient indices, and 15 vegetation indices in the farmland, grassland, scrub, forest plantation, secondary forest, and primary forest in the depressions between karst hills, this paper analyzed the main soil microbial populations, soil microbial biomass carbon (MBC), nitrogen (MBN), and phosphorus (MBP) and their fractal characteristics, and the relationships of the soil microbes with vegetation, soil nutrients, and soil mineral components under different land use patterns. The soil microbial populations differed in their quantity and composition under different land use patterns. Primary forest and farmland had the highest quantity of soil microbial populations, while forest plantation had the lowest one. The three forests had a higher proportion of soil bacteria, the farmland, grassland, and scrub had a higher proportion of actinomycetes, and all the six land use patterns had a low proportion of soil fungi. Under the six land use patterns, the soil MBC, MBN, and MBP were all high, with the maximum in primary forest. There was a good fractal relationship between the soil MBC and microbial populations, but no fractal relationships between the soil MBN and MBP and the microbial populations. Significant relationships were observed between the soil microbes and the vegetation, soil nutrients, and soil mineral components, and the soil MBC had the closest relationships with the Shannon index of tree layer and the soil total nitrogen, Fe₂O₃, and CaO contents.

宋敏1,2,3,邹冬生2,杜虎1,3,彭晚霞1,3**,曾馥平1,3,谭秋锦1,3,4,范夫静1,3,5. 不同土地利用方式下喀斯特峰丛洼地土壤微生物群落特征[J]. 应用生态学报.

SONG Min1,2,3, ZOU Dong-sheng2, DU Hu1,3, PENG Wan-xia1,3, ZENG Fu-ping1,3, TAN Qiu-jin1,3,4, FAN Fu-jing1,3,5. Characteristics of soil microbial populations in depressions between karst hills under different land use patterns.[J]. Chinese Journal of Applied Ecology.