论文摘要
Soil microorganisms play an important role in soil carbon cycle. Mycorrhizal fungi are the factors that must be taken into account but difficult to estimate in predicting CO2 release rate in forest soils. In order to investigate the effect of mycorrhizal fungi on soil respiration in karst forest, we separated the fine roots, mycelium and soil microorganism in Quercus glauca forest soil by using root separation device in Guilin karst area. The results showed that root separation device could effectively distinguish root respiration, mycelial respiration and other microbial respiration in soil of karst forest. Among them, the annual average of total soil respiration was4.19 umol CO2.m-2.s-1, root respiration was 1.92 umol CO2.m-2.s-1, other soil microbial respiration was 1.27 umol CO2.m-2.s-1, and the mycelial respiration was 0.72 umol CO2.m-2.s-1. There were significant differences among the respiratory components. The proportion of soil respiration components to total respiration was 49.25% for root respiration, 32.30% for other soil microorganisms and 18.44% for mycelium respiration.The seasonal changes of total soil respiration, root respiration, other microbial respiration and mycelial respiration in forest of Q. glauca in karst region have obvious trends. From June to August 2017, total soil respiration, root respiration and other microbial respiration increased with soil temperature, while mycelial respiration decreased. From August 2017 to February 2018, total soil respiration, root respiration and other microbial respiration rates gradually decreased, with the highest respiratory rate in August. While mycelial respiration rate increased gradually from June to October 2017. The highest proportion of root respiration was in August, about 53.59%, and the lowest proportion was in October, about 41.57%. The highest proportion of soil microbial respiration was in October, which was 35.79%, and the lowest proportion was in June, which was27.87%. The highest proportion of mycelial respiration was in October, which was 22.65%, and the lowest proportion was in August, which was 11.03%. The diurnal variation of soil respiration was similar: from morning to noon, total soil respiration, root respiration, extraroot mycelial respiration and other microbial respiration increased gradually, and then decreased gradually from noon to afternoon under the influence of air and soil temperature. In August, there were two peaks of total soil respiration in a day, the first appeared at 12 am and the second peak at 15 pm. During the whole year’s respiration measurement, the order of soil components’ respiration in karst forest was: root respiration > other microbial respiration > mycelial respiration.The results showed that mycorrhizal fungi played an important role in soil respiration in karst forests.Respiration of mycelia is obviously affected by soil temperature and soil moisture content, and the respiration rate decreases with the increase of soil temperature
论文目录
文章来源
类型: 国内会议
作者: Zhang Zhongfeng,Xu Guangping,Zhou Longwu,Zhang Denan,Teng Qiumei
来源: 多彩菌物 美丽中国——中国菌物学会2019年学术年会 2019-08-03
年度: 2019
分类: 基础科学,农业科技
专业: 自然地理学和测绘学,农业基础科学,林业
单位: Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences
分类号: S714.3
DOI: 10.26914/c.cnkihy.2019.001973
页码: 53
总页数: 1
文件大小: 822k
下载量: 3