摘要
为探索华南地区尾巨桉人工林和马占相思人工林地表温室气体的季节排放规律、排放通量和主控因子,采用静态箱-气相色谱法,对两种林型地表3种温室气体(CO_2、CH_4、N_2O)通量进行为期1年的逐月测定。结果表明:(1)尾巨桉人工林和马占相思人工林均为CO_2和N_2O的排放源,CH_4的吸收汇。马占相思林地表N_2O通量显著(P<0.01)高于尾巨桉林,CO_2通量和CH_4通量无明显差异。(2)两种林型3种温室气体通量有着相似季节变化规律,地表CO_2通量均呈现雨季高旱季低的单峰规律;地表CH_4吸收通量表现为旱季高雨季低的单峰趋势;地表N_2O通量呈现雨季高旱季低且雨季内有两个峰值的排放规律。(3)地表CO_2、N_2O通量和土壤5 cm温度呈极显著(P<0.01)正相关,3种温室气体地表通量同土壤含水量呈极显著(P<0.01)或显著相关(P<0.05)。(4)尾巨桉林和马占相思林温室气体年温室气体排放总量为31.014 t/hm^2和28.782 t/hm^2,均以CO_2排放占绝对优势(98.46%—99.15%),CH_4和N_2O处于次要地位。
To study the seasonal variation and the influence factors of fluxes of greenhouse gas （CO2, N2O, and CH4 ） emissions from the soils of a Eucalyptus urophylla × Eucalyptus grandis plantation and an Acacia mangium plantation, we conducted 1 year of continuous monitoring of the greenhouse gas fluxes from the two types of forest using a static chamber and gas chromatography. We found that the soil of both the E. urophylla × E. grandis plantation and the A. mangium plantation behaved as CO2 and N2O sources and CH4 sinks. The N2O emission fluxes from the A. mangium plantation soil were significantly higher （P〈0.01） than those from the E. urophylla × E. grandis plantation soil. There were no significant differences in the CO2 emission fluxes and CH4 uptake fluxes between the two forests. The seasonal patterns of greenhouse gas fluxes from the soils of the two types of forest were similar. The CO2 emission fluxes from the soils of the two forests were single-peak curves, high in the rainy season and lower in the dry season. The uptake fluxes of CH4 were single-peak curves,high in the dry season and lower in the rainy season. The N2O emission fluxes were higher during the rainy season than during the dry season, with two peaks in the rainy season. The fluxes of CO2 or N2O from the soils had highly significant （P〈0.01） positive correlations with soil temperature at 5 cm depth. The fluxes of greenhouse gases （CO2, N2O, and CH4） from the soils had highly significant （P〈0.01） or significant （P〈0.05） positive correlations with soil water content. The emissions of greenhouse gases from the soils of the E. urophylla × E. grandis plantation and the A. mangium plantation were 31.014 t/hm2 and 28.782 t/hm2, respectively, and were composed mainly of CO2（98.46%-99.15%） with a small amount of N2O and CH4.
作者
贾朋
高常军
李吉跃
周平
王丹
许小林
JIA Peng;GAO Changjun;LI Jiyue;ZHOU Ping;WANG Dan;XU Xiaolin(Guangzhou Institute of Geography,Guangzhou 510070,China;Guangzhou Institute of Forestry and Landscape Architecture,Guangzhou 510405,China;Guangdong Academy of Forestry,Guangzhou 510520,China;College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,China)
出处
《生态学报》
CAS
CSCD
北大核心
2018年第19期6903-6911,共9页
Acta Ecologica Sinica
基金
广东省科技发展创新专项(2017GDASCX-0701)
广州市森林碳汇计量与监测研究(2013-2019)
