北京地区暖温带森林土壤温室气体排放规律

本研究利用静态箱法在北京市东灵山暖温带森林生长期选择3种不同类型的森林(阔叶混交林、辽东栎林和油松林)的土壤进行了温室气体(CH₄、CO₂和N₂O)排放规律的野外原位观测.研究结果表明:暖温带主要代表森林类型的土壤作为CH₄的汇吸收大气中的CH₄,同时作为CO₂和N₂O的源向大气排放.观测结果显示:不同的森林土壤类型其温室气体排放通量、范围各不相同,阔叶混交林土壤CH₄、CO₂和N₂O通量范围分别是:42～103μg/(m²·h),15～344mg/(m²·h)和-61～101μg/(m²·h);辽东栎林土壤3种气体通量范围分别是:13～182 μg/(m²·h),23～380mg/(m²·h)和-15～183 μg/(m²·h);油松林土壤3种气体通量范围分别是:12～128 μg/(m²·h),15～292mg/(m²·h) 和 -94～153 μg/(m²·h).观测期内阔叶混交林土壤CH₄、CO₂和N₂O平均通量分别是:-66 μg/(m²·h),145mg/(m²·h)和22 μg/(m²·h);辽东栎林土壤3种气体平均通量分别是:-67 μg/(m²·h),146mg/(m²·h)和45μg/(m²·h);油松林土壤3种气体平均通量分别是:-79 μg/(m²·h),150mg/(m²·h)和31μg/(m²·h).本研究估算了不同类型的森林土壤不同的温室气体生长期内的排放总量,阔叶混交林土壤CH₄、CO₂和N₂O排放总量分别是:-5.34kg/(hm²·a),13.9Mg/(hm²·a) 和2.58kg/(hm²·a); 辽东栎林土壤3种气体排放总量分别是:-6.20kg/(hm²·a), 14.07Mg/(hm²·a)和4.19kg/(hm²·a); 油松林土壤3种气体排放总量分别是-6.85kg/(hm²·a), 15.71Mg/(hm²·a)和4.30kg/(hm²·a).

The Research on the Law of Greenhouse Gases Emission from Warm Temperate Forest Soils in Beijing Region

In situ measurements by closed chamber technique were done to investigate the law of greenhouse gases (Methane, carbon dioxide and Nitrous Oxide) fluxes emission from different warm temperate forest soils (Broad-leaved forest, Form. Quercus liaotungensis and Form. Pinus tabulae) of Dongling mountain in Beijing region. Results show that the all representative types forest soils were sink of CH4 and source of CO2 and N2O. Different type of vegetables and soils result of different fluxes range of the main greenhouse gases. The fluxes range of CH4, CO2 and N2O emission from the three types forest soils were: 42-103 micrograms/(m2.h), 15-344 mg/(m2.h) and -61-101 micrograms/(m2.h); 13-182 micrograms CH4/m2.h, 23-380 mg/(m2.h) and -15-183 micrograms/(m2.h); 12-128 ug CH4/m2.h, 15-292 mg/(m2.h) and -94-153 micrograms/(m2.h); respectively. The mean fluxes of CH4, CO2 and N2O emission from the three types forest soils during the observation period were: -66 micrograms/(m2.h), 145 mg/(m2.h) and 22 micrograms/(m2.h); -67 micrograms/(m2.h), 146 mg/(m2.h) and 45 micrograms/(m2.h); -79 micrograms/(m2.h), 150 mg/(m2.h) and 31 micrograms/(m2.h), respectively. The total amounts of CH4 CO2 and N2O emission from the three types forest soils were -5.34 kg/(hm2.a), 13.9 Mg/(hm2.a) and 2.58 kg/(hm2.a); -6.20 kg/(hm2.a), 14.07 Mg/(hm2.a) and 4.19 kg/(hm2.a); -6.85 kg/(hm2.a), 15.71 Mg/(hm2.a) and 4.30 kg/(hm2.a), respectively.