生态学报2018，Vol.38Issue(8)：2915-2924,10.DOI:10.5846/stxb201705311005
中度火干扰对兴安落叶松林土壤呼吸的影响
Effects of fire disturbances on soil respiration in Dahurian Larch (Larix gmelinii) forests
摘要
Abstract
This study investigated the increasing seasonal soil respiration (Rs) in the Dahurian Larch (Larix gmelinii) forests after fire disturbance in the Tahe area,and identified the main environmental factors influencing soil respiration changes after fires.Plots that had been under fire disturbance over four years in the Tahe forestry bureau were selected for this investigation,and the nearby unbumt area was selected for the control plots.The Rs was measured by using an Li8100,and the trench method was used to measure the soil heterotrophic respiration (Rh).The mean Rs of post-fire plots and unburnt control plots was (3.67±1.03)μmol CO2 m-2 s-1 and (4.21±1.25)μmol CO2 m-2 s-1,respectively.The Rs in the post-fire plots was significantly lower than that in the unburnt control plots (P ＜ 0.05).We quantified the Rs component changes after fire disturbance.The decrease in Rs was mainly due to a significantly decreased autotrophic respiration (Ra) rate (P ＜ 0.05).Soil temperature was the dominant environmental factor influencing soil respiration variability in this area.Compared with the unburnt control plots,the Rs in the post-fire plots had a much stronger correlation with soil temperature.The temperature sensitivity index (Q10) of Rs in the post-fire plots and unburnt control plots was 5.85± 1.06 and 4.25±1.19,respectively.The Q10 value significantly increased after fire disturbance (P ＜ 0.05).In view of the global climate change,the results of this study demonstrate that the Dahurian Larch (L.gmelinii) forest ecosystem in the Tahe area of China is sensitive to temperature change.Our findings provide scientific basis for research on carbon cycling after fire disturbance in the Tahe area of China.关键词
火干扰/土壤呼吸/兴安落叶松/环境因子/土壤呼吸温度敏感性指数(Q10)Key words
fire disturbance/soil respiration/Larix gmelinii/environmental factors/temperature sensitivity index (Q10)引用本文复制引用
胡同欣,胡海清,孙龙..中度火干扰对兴安落叶松林土壤呼吸的影响[J].生态学报,2018,38(8):2915-2924,10.基金项目
中央高校基本科研业务费专项资金项目(2572015DA01) （2572015DA01）
国家自然科学基金项目(31470657) （31470657）
