长白山红松针阔混交林CO_2通量的日变化与季节变化  

Diurnal and Seasonal Variation of CO_2 Flux Above the Korean Pine and Broad-Leaved Mixed Forest in Changbai Mountain

作　　者：关德新[1] 吴家兵[1] 金昌杰[1] 韩士杰[1] 张弥[1] 施婷婷[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016

出　　处：《林业科学》2006年第10期123-128,共6页Scientia Silvae Sinicae

基　　金：国家自然科学基金(30370293);中国科学院知识创新重大项目(KZCX1-SW-01-01A1);中国科学院沈阳应用生态研究所领域前沿项目资助。

摘　　要：Diurnal and seasonal variation of CO2 flux above the Korean Pine and broadleaved mixed forest in Changbai Mountain were expounded according to the measurements by eddy covariance technique. The results showed that the diurnal variation during growing season was closely correlated with photosynthetically active radiation （PAR）. The forest assimilated the CO2 in daytime and released in night. The maximum uptake occurred about 9 o’clock of local time in clear day. Assimilation was synchronous to PAR in cloudy day. The night respiration increased with increasing of shallow soil temperature. The CO2 flux also had obviously seasonal variation that was mainly controlled by temperature. Relationship between monthly net exchange of CO2 and monthly mean air temperature fit cubic equation. Remarkable uptake occurred in blooming growing season,May to August,and weak respiration occurred in dormant season,October to March,and relatively big release happed in October. Assimilation and respiration were nearly balanced during the transition of growing and dormant seasons. The annual carbon uptake of the ecosystem was-184 gC·m -2 .Diurnal and seasonal variation of CO2 flux above the Korean Pine and broad-leaved mixed forest in Changbai Mountain were expounded according to the measurements by eddy covariance technique. The results showed that the diurnal variation during growing season was closely correlated with photosynthetically active radiation （PAR）. The forest assimilated the CO2 in daytime and released in night. The maximum uptake occurred about 9 o＇ clock of local time in clear day. Assimilation was synchronous to PAR in cloudy day. The night respiration increased with increasing of shallow soil temperature. The CO2 flux also had obviously seasonal variation that was mainly controlled by temperature. Relationship between monthly net exchange of CO2 and monthly mean air temperature fit cubic equation. Remarkable uptake occurred in blooming growing season, May to August, and weak respiration occurred in dormant season, October to March, and relatively big release happed in October. Assimilation and respiration were nearly balanced during the transition of growing and dormant seasons. The annual carbon uptake of the ecosystem was- 184 g^C·m^-2.

关 键 词：CO2通量 红松针阔叶混交林 日变化和季节变化 

分 类 号：S718.55[农业科学—林学]