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Temporal dynamics and vertical variations in stem CO2 efflux of Styphnolobium japonicum
Han, Fengsen; Wang, Xiaolin; Zhou, Hongxuan; Li, Yuanzheng; Hu, Dan
2017-09-01
Source PublicationJOURNAL OF PLANT RESEARCH
Volume130Issue:5Pages:845-858
AbstractCO2 efflux (E-CO2) from stems and branches is highly variable within trees. To investigate the mechanisms underlying the temporal dynamics and vertical variations in E-CO2, we measured the stem E-CO2 by infrared gas analysis (IRGA) and meteorological conditions at 10 different heights from 0.1 to 3.7 m aboveground on two consecutive days every month for 1 year in six Styphnolobium japonicum trees with a similar size. The results indicated that the seasonal change in E-CO2 roughly followed the seasonal variations in woody tissue temperature (T-W) and stem radial diameter increment (Di). Together, T-W and Di explained the monthly change in E-CO2, and the contributions of T-W and Di changed with the stem positions and growth stages. The diurnal patterns of E-CO2 differed greatly between the growing and dormant season, showing a bimodal distribution with an obvious midday depression in the former and a unimodal distribution in the latter. The strong vertical variation in the day-time E-CO2 of the growing season was mainly caused by the vertical gradients of T-W, Di and difference in sapwood volume per unit of the stem surface along the trunk. The temperature-sensitivity coefficient (Q(10)) was not constant, as assumed in some models, but was instead vertically altered and highly dependent on the measurement temperature. For all stem positions, the highest Q(10) value appeared at approximately 5 A degrees C, and both higher and lower temperatures decreased Q(10). Our study demonstrated that application of a constant Q(10) would cause an estimation error when scaling up chamber-based measurements to annual carbon budgets at the whole-stem level.
Department城市与区域生态国家重点实验室
Keywordq(10) Temperature-sensitivity Coefficient Temporal Dynamics Vertical Variations Stem Co2 Efflux
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/39120
Collection城市与区域生态国家重点实验室
Recommended Citation
GB/T 7714
Han, Fengsen,Wang, Xiaolin,Zhou, Hongxuan,et al. Temporal dynamics and vertical variations in stem CO2 efflux of Styphnolobium japonicum[J]. JOURNAL OF PLANT RESEARCH,2017,130(5):845-858.
APA Han, Fengsen,Wang, Xiaolin,Zhou, Hongxuan,Li, Yuanzheng,&Hu, Dan.(2017).Temporal dynamics and vertical variations in stem CO2 efflux of Styphnolobium japonicum.JOURNAL OF PLANT RESEARCH,130(5),845-858.
MLA Han, Fengsen,et al."Temporal dynamics and vertical variations in stem CO2 efflux of Styphnolobium japonicum".JOURNAL OF PLANT RESEARCH 130.5(2017):845-858.
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