STEM RESPIRATION RATES OF DOMINANT TREE SPECIES IN A TROPICAL SEASONAL RAIN FOREST IN XISHUANGBANNA, YUNNAN, SOUTHWEST CHINA

doi:10.3773/j.issn.1005-264x.2008.01.003

Abstract

Abstract:

Aims Forest is an important pool of carbon in terrestrial ecosystems. Woody tissues contribute much biomass, and their respirations influence carbon fixation. Stem respiration is an important component of the carbon budget of forest stands. Stem respiration has been studied in temperate and boreal zones, but seldom has been reported for tropical rain forests. Our objective was to investigate the characteristics of stem respiration and the response of stem respiration to temperature in 11 common trees in Xishuangbanna tropical seasonal rain forest.
Methods We made in situ chamber measurements of stem respiration using an Li-820 infra-red CO₂ gas analyzer (IRGA) from March 2005 to February 2006. Our custom-built polyvinyl chloride (PVC) chamber sealed to the stem by thin neoprene gaskets. Stem respiration rates were measured on south and north sections at 1.3 m height, and stem temperatures were recorded at 1 cm depth.
Important findings Stem respiration rates of all species had similar seasonal patterns and were higher in the wet season and lower in the dry season. There were significant differences in stem respiration rates among species, ranging from 0.823 to 2.727 μmol·m^-2·s^-1. Stem respiration rates on the south and north sections were similar for the same species. Significant exponential correlations were observed between stem respiration rates and stem temperatures (0.55<R²<0.92). Q₁₀ values for stem respiration among species ranged from 1.90 to 3.03, somewhat higher than the range (1.6-2.38) reported in previous studies.

Key words: tropical seasonal rain forest, dominant tree species, stem respiration, stem temperature, Q₁₀

YAN Yu-Ping, SHA Li-Qing, CAO Min. STEM RESPIRATION RATES OF DOMINANT TREE SPECIES IN A TROPICAL SEASONAL RAIN FOREST IN XISHUANGBANNA, YUNNAN, SOUTHWEST CHINA[J]. Chin J Plant Ecol, 2008, 32(1): 23-30.

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References 44

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树种 Species	重要值 IV	胸径DBH (cm)	南 South					北 North					两方向均值 Means in two sections
树种 Species	重要值 IV	胸径DBH (cm)	R_T	k	β	Q₁₀	r²	R_T	k	β	Q₁₀	r²	R_T
番龙眼Pometia tomentosa	30.55	27.4~35.5 (3)	1.603	0.109	0.182	2.97	0.80	1.642	0.103	0.210	2.80	0.77	1.62
玉蕊Barringtonia macrostachya	23.19	28.6~41.2 (3)	1.324	0.094	0.204	2.55	0.82	1.276	0.108	0.148	2.94	0.86	1.30
白颜树Gironniera subaequalis	15.26	21.2~27.4 (3)	1.499	0.109	0.169	2.97	0.79	1.482	0.111	0.162	3.03	0.83	1.49
滇南溪桫Chisocheton siamensis	9.76	16.8~17.5 (2)	0.932	0.096	0.136	2.62	0.86	0.814	0.097	0.118	2.63	0.87	0.87
细柄罗伞Ardisia tenera	9.15	12.1~17.2 (2)	0.706	0.067	0.186	1.95	0.82	0.835	0.079	0.174	2.19	0.77	0.77
蚁花Mezzettiopsis creaghii	7.04	22.9~24.4 (2)	0.901	0.090	0.149	2.46	0.79	1.007	0.100	0.136	2.72	0.82	0.95
窄序崖豆树Millettia leptobotrya	7.04	19.1 (1)	1.289	0.104	0.160	2.84	0.92	1.308	0.106	0.156	2.90	0.91	1.30
毒鼠子Dichapetalum gelonioides	6.06	19.3~25.5 (2)	0.924	0.081	0.182	2.25	0.76	1.034	0.088	0.179	2.40	0.81	0.979
毛果猴欢喜Sloanea dasycarpa	5.09	28.7~30.7 (2)	2.655	0.104	0.330	2.84	0.74	2.484	0.108	0.285	2.95	0.81	2.57
棒柄花Cleidion spiciflorum		27.1 (1)	0.677	0.066	0.181	1.93	0.68	0.875	0.080	0.176	2.23	0.60	0.78
蓝果谷木Memecylon cyanocarpum		23.9 (1)	0.868	0.064	0.241	1.90	0.69	0.921	0.066	0.246	1.94	0.55	0.90
均值 Mean				1.154	0.089	0.193	2.48		1.203	0.094	0.183	2.59	1.18

树种 Species	重要值 IV	胸径DBH (cm)	南 South					北 North					两方向均值 Means in two sections
树种 Species	重要值 IV	胸径DBH (cm)	R_T	k	β	Q₁₀	r²	R_T	k	β	Q₁₀	r²	R_T
番龙眼Pometia tomentosa	30.55	27.4~35.5 (3)	1.603	0.109	0.182	2.97	0.80	1.642	0.103	0.210	2.80	0.77	1.62
玉蕊Barringtonia macrostachya	23.19	28.6~41.2 (3)	1.324	0.094	0.204	2.55	0.82	1.276	0.108	0.148	2.94	0.86	1.30
白颜树Gironniera subaequalis	15.26	21.2~27.4 (3)	1.499	0.109	0.169	2.97	0.79	1.482	0.111	0.162	3.03	0.83	1.49
滇南溪桫Chisocheton siamensis	9.76	16.8~17.5 (2)	0.932	0.096	0.136	2.62	0.86	0.814	0.097	0.118	2.63	0.87	0.87
细柄罗伞Ardisia tenera	9.15	12.1~17.2 (2)	0.706	0.067	0.186	1.95	0.82	0.835	0.079	0.174	2.19	0.77	0.77
蚁花Mezzettiopsis creaghii	7.04	22.9~24.4 (2)	0.901	0.090	0.149	2.46	0.79	1.007	0.100	0.136	2.72	0.82	0.95
窄序崖豆树Millettia leptobotrya	7.04	19.1 (1)	1.289	0.104	0.160	2.84	0.92	1.308	0.106	0.156	2.90	0.91	1.30
毒鼠子Dichapetalum gelonioides	6.06	19.3~25.5 (2)	0.924	0.081	0.182	2.25	0.76	1.034	0.088	0.179	2.40	0.81	0.979
毛果猴欢喜Sloanea dasycarpa	5.09	28.7~30.7 (2)	2.655	0.104	0.330	2.84	0.74	2.484	0.108	0.285	2.95	0.81	2.57
棒柄花Cleidion spiciflorum		27.1 (1)	0.677	0.066	0.181	1.93	0.68	0.875	0.080	0.176	2.23	0.60	0.78
蓝果谷木Memecylon cyanocarpum		23.9 (1)	0.868	0.064	0.241	1.90	0.69	0.921	0.066	0.246	1.94	0.55	0.90
均值 Mean				1.154	0.089	0.193	2.48		1.203	0.094	0.183	2.59	1.18