首页  实验室概况  研究成果  人才队伍  研究生培养  合作交流  省重点实验室  下载中心 
新闻动态

傅声雷研究团队揭示林冠氮沉降提 2024-06-17
郭丽君一行赴大别山国家站调研并 2023-07-18
2023年中国地理学会农业地理与乡 2023-07-18
河南大学与信阳市人民政府举行信 2023-07-08
河南大学喜获10项2022年度河南省 2023-03-27
河南大学与信阳市政府共建 “信 2023-03-27

下载中心
您的位置: 首页>>下载中心>>正文

PLANT AND SOIL(2004)--Defoliation affects rhizosphere respiration and rhizosphere priming effect on decomposition of soil organic matter under a sunflower species: Helianthus annuus
2020-03-12 17:31  

In the present study, 'natural C-13 tracer method' was used to partition the belowground respiration into rhizosphere respiration and soil microbial respiration to test the hypothesis that defoliation affects rhizosphere respiration and rhizosphere priming effect on decomposition of soil organic matter (SOM). A C-3 plant species, Helianthus annuus (sunflower), was grown in 'C-4' soil in microcosms so that the CO2 evolved from plant-soil system can be partitioned. Four levels of defoliation intensities were established by manual clipping. CO2 evolved from plant-soil system was trapped during 0-4 h after defoliation (HAD), 5-22 HAD and 23-46 HAD using a closed circulating system, respectively. We found that both rhizosphere respiration and soil microbial respiration of the clipped plants were either unchanged or significantly enhanced compared to unclipped plants at 45% defoliation level during all sampling intervals. Soil microbial respiration increased significantly at all defoliation levels during 0-4 HAD, however, both rhizosphere respiration and soil microbial respiration decreased significantly during 5-22 HAD or 23-46 HAD when 20% or 74 clearly demonstrated that the defoliation treatments modified the rhizosphere priming effect on SOM decomposition. The total cumulative rhizosphere priming effects on SOM decomposition during 0-46 HAD were 146%,241%,204% and 205% when 0%, 20%,45% and <74%.

附件【Defoliation_affects_rhizosphere_respiration_and_rh(一作).pdf已下载
关闭窗口

河南大学生态地理学实验室