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首页> 外文期刊>Ecological research >Diurnal variations and gap effects of soil CO_2, N_2O and CH_4 fluxes in a typical tropical montane rainforest in Hainan Island, China
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Diurnal variations and gap effects of soil CO_2, N_2O and CH_4 fluxes in a typical tropical montane rainforest in Hainan Island, China

机译：海南岛典型热带山地雨林土壤CO_2，N_2O和CH_4通量的日变化及其缺口效应

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摘要

Accurate estimations of soil greenhouse gas (GHG) fluxes in tropical montane rainforests are critical for assessing the role of tropical forests in influencing global climate change. This research aimed to determine the diurnal variation in soil GHG fluxes and understand the effects of forest canopy gaps on GHG fluxes, and their major controlling factors. The diurnal fluxes of soil carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4) inside and outside three forest canopy gaps in a tropical montane rainforest were measured with a closed static chamber system in June 2015. The main results are as follows. (1) There was an obvious single-peak daily variation of soil GHG fluxes. (2) The averaged soil CO2, N2O and CH4 fluxes of the whole day were closest to the daily average emission fluxes at 9:00 and 12:00 for CO2, 6:00 and 9:00 for N2O, and 9:00 and 12:00 for CH4, respectively. (3) Soil CO2 and N2O emissions (positive values) and CH4 uptake (negative values) were higher inside gaps than outside. (4) There were stronger exponential relationships between soil CO2 and N2O emissions and temperature inside gaps than outside, and there was a stronger quadratic relationship between CH4 uptake and temperature outside gaps than inside. However, significant relationships between soil CO2 (or CH4) and soil moisture only occurred inside gaps (P 0.01). There were clear diurnal variations and significant effects of gaps on soil CO2, N2O and CH4 fluxes. Our study indicated that understanding the different diurnal variations of soil CO2, N2O and CH4 fluxes inside and outside canopy gaps could improve the accurate evaluation of soil GHG fluxes in tropical montane rainforests under a changing climate.
机译：准确估算热带山地雨林中的土壤温室气体（GHG）通量对于评估热带森林在影响全球气候变化中的作用至关重要。这项研究旨在确定土壤温室气体通量的日变化，并了解林冠间隙对温室气体通量的影响及其主要控制因素。在2015年6月，采用封闭的静室系统测量了热带山地雨林中三个林冠间隙内外的土壤二氧化碳（CO2），一氧化二氮（N2O）和甲烷（CH4）的日通量。主要结果如下：如下。 （1）土壤GHG通量存在明显的单峰日变化。 （2）全日平均土壤CO2，N2O和CH4通量最接近于CO2的9:00和12：00，N2O的6:00和9:00以及9:00和9的日平均排放通量。 CH4分别为12:00。 （3）间隙内部的土壤CO2和N2O排放（正值）和CH4吸收（负值）高于外部。 （4）土壤CO 2和N 2 O排放量与气隙内温度之间的指数关系强于外部，并且CH 4吸收与气隙外温度之间的二次关系强于内部。但是，土壤CO2（或CH4）与土壤水分之间的显着关系仅出现在缝隙内部（P <0.01）。明显的昼夜变化和间隙对土壤CO2，N2O和CH4通量的显着影响。我们的研究表明，了解林冠间隙内外的土壤CO2，N2O和CH4通量的不同日变化，可以提高气候变化下热带山地雨林土壤温室气体通量的准确评估。

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