首页|Different mechanisms underlying divergent responses of autotrophic and heterotrophic respiration to long-term throughfall reduction in a warm-temperate oak forest

Different mechanisms underlying divergent responses of autotrophic and heterotrophic respiration to long-term throughfall reduction in a warm-temperate oak forest

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
  • 维普
Background:There are many studies on disentangling the responses of autotrophic (AR) and heterotrophic (HR) respiration components of soil respiration (SR) to long-term drought, but few studies have focused on the mechanisms underlying its responses. Methods:To explore the impact of prolonged drought on AR and HR, we conducted the 2-year measurements on soil CO2 effluxes in the 7th and 8th year of manipulated throughfall reduction (TFR) in a warm-temperate oak forest. Results:Our results showed long-term TFR decreased HR, which was positively related to bacterial richness. More importantly, some bacterial taxa such as Novosphingobium and norank Acidimicrobiia, and fungal Leptobacillium were identified as major drivers of HR. In contrast, long-term TFR increased AR due to the increased fine root biomass and production. The increased AR accompanied by decreased HR appeared to counteract each other, and subsequently resulted in the unchanged SR under the TFR. Conclusions:Our study shows that HR and AR respond in the opposite directions to long-term TFR. Soil microorganisms and fine roots account for the respective mechanisms underlying the divergent responses of HR and AR to long-term TFR. This highlights the contrasting responses of AR and HR to prolonged drought should be taken into account when predicting soil CO2 effluxes under future droughts.

Prolonged droughtCO2 effluxFine rootBacterial communityFungal community

Jinglei Zhang、Shirong Liu、Cuiju Liu、Hui Wang、Junwei Luan、Xiaojing Liu、Xinwei Guo、Baoliang Niu

展开 >

Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Research Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry,Beijing 100091,China

Institute of Resources and Environment,Key Laboratory of Bamboo and Rattan Science and Technology of the State Forestry and Grassland Administration,International Centre for Bamboo and Rattan,Beijing 100102,China

Baotianman Natural Reserve Administration,Neixiang 474350,China

2018YFC050730199802–2020

2021

森林生态系统(英文版)
北京林业大学

森林生态系统(英文版)

CSTPCDCSCDSCI
影响因子：0.09
ISSN：2095-6355
年,卷(期)：2021.8(3)
  • 61