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石灰岩山地4种林分空气细菌动态变化及其影响因素分析
刘畅,赵家豪,叶钰倩,关庆伟
0
(南京林业大学生物与环境学院,南京 210037)
摘要:
为探索石灰岩山地不同林分类型中空气细菌的动态变化规律及其影响因素,筛选出抑菌效果较好的林分,选取徐州石灰岩山地4种典型林分为试验材料,采用自然沉降法研究林分中细菌含量的季节变化和日变化,同步监测温湿度、风速、PM2.5和空气负离子浓度,分析空气细菌含量及其之间的关系。试验结果表明:(1)细菌含量季节性变化表现为春季>秋季>夏季>冬季,除冬季日变化呈现“早晚低,中午高”的变化趋势,其他季节表现为“早晚高,中午低”;(2)不同林分类型空气细菌含量存在显著差异(P<0.05),总体来看,苦楝林对细菌的抑制效果最好;(3)细菌含量与空气湿度和PM2.5呈极显著正相关关系,与空气负离子呈极显著的负相关关系。综上,苦楝林的抑菌效果最好,湿度、PM2.5和负离子是影响空气细菌含量的主要因素。本研究可为此地城市保健林的营建以及生态旅游规划提供科学依据。
关键词:  石灰岩山地  空气细菌  动态变化  影响因素
DOI:10.13610/j.cnki.1672-352x.20200518.004
投稿时间:2019-05-30
基金项目:江苏省林业三新工程(LYSX[2016]06)和PAPD项目共同资助。
Dynamic change of air bacteria and analysis of its influencing factors in four stands in Xuzhou limestone mountains
LIU Chang,ZHAO Jiahao,YE Yuqian,GUAN Qingwei
(College of Biology and Environment, Nanjing Forestry University, Nanjing 210037)
Abstract:
In order to clarify the dynamic change of air bacteria and its influencing factors in different forest types in limestone hills and their influence factors, we screened out those with good bacteriostatic effect, four typical stands in Xuzhou limestone mountain area were selected as experimental materials, the seasonal and daily changes of bacterial content in stands were studied by natural sedimentation method, temperature and humidity, wind speed, PM2.5 and air negative ion concentration were monitored synchronously, analysed the relationship between the content of air bacteria and environmental factors. The results showed that:(1) Bacterial content in spring > autumn > summer > winter, the daily variation regularity in other seasons was‘ high in morning and evening and low in noon’ while ‘high in noon and low in morning and evening’ in winter; (2) There were significant differences in air bacterial content among different stand types in the same season (P < 0.05). In general, Melia azedarach was the best in inhibiting bacteria; (3) The content of air bacteria had an extremely significant positive correlation with humidity and PM2.5, and an extremely significant negative correlation with air negative ions. In conclusion, Melia azedarach had the best bacteriostatic effect. Humidity, PM2.5 and negative ions were the main factors influencing the air bacterial content. This study can provide a scientific basis for the construction of urban health forest and the planning of ecotourism in the area.
Key words:  limestone mountains  air bacteria  dynamic change  influencing factors

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