[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.