CAJ | 학술논문

森林土壤是CO_2、CH4和N_2O等温室气体的重要排放源.采用静态箱/色谱分析技术对中国科学院鹤山丘陵综合开放试验站的尾叶桉(Eucalyptus urophylla)林土壤CO_2、CH_4和N_2O排放通量进行了原位测定,研究剔除林下灌草和添加翅荚决明(Cassia alata)对尾叶桉林土壤温室气体排放的影响.结果表明:尾叶桉林土壤CO_2排放通量在湿季维持在较高水平,在旱季则明显降低.CH_4和N_2O在湿季波动幅度较大,在旱季则相对稳定.土壤CO_2和CH_4通量峰值均出现在湿季,但N_2O峰值出现在旱季的12月.尾叶桉林土壤在不同处理下可能是CH_4的源,也可能是CH_4的汇,而对于CO_2和N2O则主要是源.尾叶桉林下剔除灌草及添加翅英决明能显著增大土壤CO_2和N_2O的排放,但林下灌草剔除后有利于CH_4的吸收,添加翅荚决明有利于CH_4的排放.表层土壤温度和湿度是影响土壤温室气体排放的首要因子.呼吸底物(氮源)和土壤微生物量也是影响土壤温室气体排放的重要因子.
삼림토양시CO_2、CH4화N_2O등온실기체적중요배방원.채용정태상/색보분석기술대중국과학원학산구릉종합개방시험참적미협안(Eucalyptus urophylla)림토양CO_2、CH_4화N_2O배방통량진행료원위측정,연구척제림하관초화첨가시협결명(Cassia alata)대미협안림토양온실기체배방적영향.결과표명:미협안림토양CO_2배방통량재습계유지재교고수평,재한계칙명현강저.CH_4화N_2O재습계파동폭도교대,재한계칙상대은정.토양CO_2화CH_4통량봉치균출현재습계,단N_2O봉치출현재한계적12월.미협안림토양재불동처리하가능시CH_4적원,야가능시CH_4적회,이대우CO_2화N2O칙주요시원.미협안림하척제관초급첨가시영결명능현저증대토양CO_2화N_2O적배방,단림하관초척제후유리우CH_4적흡수,첨가시협결명유리우CH_4적배방.표층토양온도화습도시영향토양온실기체배방적수요인자.호흡저물(담원)화토양미생물량야시영향토양온실기체배방적중요인자.
Aims CO_2, CH_4 and N_2O are important greenhouse gases, and they mainly come from soils in forest ecosystems. Our objective was to analyze the effects of removal of the understory and addition of Cassia alata on soil CO_2, CH_4 and N_2O emissions in Heshan Hilly Land Interdisciplinary Experimental Station, Chinese Academy of Sciences, Guangdong Province, China. Methods CO_2, CH4 and N_2O fluxes in a Eucalyptus urophylla plantation were measured in situ using the static chamber technique from June 2007 to May 2008.Important findings CO_2 fluxes stayed at a relatively high level during the rainy season and a lower level in the dry season, while CH_4 and N_2O fluxes varied widely in the rainy season and were stable in the dry season. Peak values of CO_2and CH_4 appeared in the rainy season, while the peak value of N_2O flux was in the dry season (December). The E. urophylla plantation soil was a sink or source for CH_4 while consistently a source for CO_2 and N_2O. Understory removal and C. alata addition significantly enhanced CO_2 (p<0.01) and N_2O fluxes (p<0.01), while decreasing or increasing CH_4 fluxes under the same treatments. Results indicated that soil temperature, soil moisture, NO_3-N and microbial biomass carbon (MBC) might be important variables for soil CO_2, CH4 and N_2O fluxes.