Respiration rates of stems at different heights and their sensitivity to temperature in two broad-leaved trees in Beijing

doi:10.17521/cjpe.2015.0019

Abstract

Abstract: Aims

Woody-tissue respiration (R_w) is well known to be a large component of the terrestrial ecosystem carbon balance. In order to quantify the intra- and inter-specific variations in stem respiration, investigations were made on the temporal and vertical variations in R_w in order to reveal the vertical pattern and the regulatory mechanisms of the temperature-sensitivity coefficient (Q₁₀).

Methods

CO₂ release rates and stem temperature were measured in two typical deciduous species (Sophora japonica and Salix matsudana) from March through December 2013 in a suburban park in Beijing. All measurements were carried out at three heights (10 cm, 140 cm and 270 cm) corresponding to the base, breast height and first branch of the trees.

Important findings

It was found that the stem respiration differed significantly between the two tree species. The R_w in Sophora japonica was 1.12 (July) to 1.79 (May) times of that in Salix matsudana for the same months except in April. Clear diurnal cycles and strong seasonal variations were found in the stem respiration per unit surface area (R_S). The seasonal variation patterns of R_w were unimodal for both species; however, the peak month differed between the two species, i.e. July ((5.13 ± 0.24) μmol·m^-2·s^-1) for Sophora japonica and August ((3.85 ± 0.17) μmol·m^-2·s^-1) for Salix matsudana. Stem respiration during the growing season (July and August) was high- er than in the dormant season (November and December); whereas the seasonal variations of Q₁₀ showed opposite trend, i.e. higher in the dormant season than during the growing season. R_W increased and the diel patterns of R_w varied with height; the pattern of stem respiration was unimodal for trunk and diauxie for branches, respectively. Stem temperature was found to be the dominant factor regulating the diurnal dynamics of stem respiration at a daily scale. In addition, Q₁₀ higher at the top than at the base. Stem temperature and Q₁₀ collectively determined the temporal and vertical patters of stem respiration. During the growing months, daily accumulated respiration per volume of woody tissue (mmol·m^-3·d^-1) was linearly related to the inverse of stem diameter measured at breast height. The level of respiration was better expressed on area base (μmol·m^-2·s^-1) for comparisons among individuals and examination of temporal and spatial variations of the same individual. Therefore, the spatial and temporal variability of R_w should be considered in the construction of city forest carbon budget model so as to reduce the estimation error.

Key words: stem respiration, temporal dynamics, vertical variations, temperature-sensitivity coefficient (Q10), urban ecology

HAN Feng-Sen,HU Dan,WANG Xiao-Lin,ZHOU Hong-Xuan. Respiration rates of stems at different heights and their sensitivity to temperature in two broad-leaved trees in Beijing[J]. Chin J Plan Ecolo, 2015, 39(2): 197-205.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2015.0019

https://www.plant-ecology.com/EN/Y2015/V39/I2/197

Figures/Tables 9

References 32

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树种 Species	代码 Code	树高 Height (m)	测点直径 Diameter at measurement point (cm)
树种 Species	代码 Code	树高 Height (m)	10^a	140^a	270^a
槐 Sophora japonica	So1	12.6	22.4	17.2	10.8
	So2	14.7	26.3	18.6	14.5
	So3	16.4	31.6	21.5	17.6
旱柳 Salix matsudana	Sa1	13.8	21.6.	16.8	12.9
旱柳 Salix matsudana	Sa2	15.7	29.1	22.6	18.5
	Sa3	18.4	34.2	28.7	22.8

树种 Species	代码 Code	树高 Height (m)	测点直径 Diameter at measurement point (cm)
树种 Species	代码 Code	树高 Height (m)	10^a	140^a	270^a
槐 Sophora japonica	So1	12.6	22.4	17.2	10.8
	So2	14.7	26.3	18.6	14.5
	So3	16.4	31.6	21.5	17.6
旱柳 Salix matsudana	Sa1	13.8	21.6.	16.8	12.9
旱柳 Salix matsudana	Sa2	15.7	29.1	22.6	18.5
	Sa3	18.4	34.2	28.7	22.8

树种 Species	月份 Month	回归方程 Regression equation	Q₁₀	R₁₀ (μmol·m^-2·s^-1)	R²
槐 Sophora japonica	6-8	Y = 0.8945e^0.0779^x	2.18	1.95	0.77^**
槐 Sophora japonica	10-12	Y = 0.5943e^0.0892^x	2.44	1.45	0.87^**
旱柳 Salix matsudana	6-8	Y = 0.8771e^0.0582^x	1.79	1.57	0.82^**
旱柳 Salix matsudana	10-12	Y = 0.4674e^0.0599^x	1.86	0.87	0.88^**

树种 Species	月份 Month	回归方程 Regression equation	Q₁₀	R₁₀ (μmol·m^-2·s^-1)	R²
槐 Sophora japonica	6-8	Y = 0.8945e^0.0779^x	2.18	1.95	0.77^**
槐 Sophora japonica	10-12	Y = 0.5943e^0.0892^x	2.44	1.45	0.87^**
旱柳 Salix matsudana	6-8	Y = 0.8771e^0.0582^x	1.79	1.57	0.82^**
旱柳 Salix matsudana	10-12	Y = 0.4674e^0.0599^x	1.86	0.87	0.88^**

树种 Species	枝干高度 Stem height (cm)	回归方程 Regression equation	时间滞后 Time lag (min )	Q₁₀	R²
槐 Sophora japonica	10	Y = 0.8761e^0.0736^x	154	2.09	0.722^**
	140	Y = 0.9024e^0.0821^x	136	2.27	0.754^*
	270	Y = 1.0132e^0.0918^x	122	2.50	0.846^**
旱柳 Salix matsudana	10	Y = 0.8115e^0.0429^x	176	1.54	0.707^**
旱柳 Salix matsudana	140	Y = 0.9232e^0.0547^x	152	1.73	0.854^**
	270	Y = 0.9273e^0.0749^x	126	2.11	0.955^**