SEASONAL CHANGES OF PHOTOSYNTHETIC CHARACTERISTICS IN 12 TREE SPECIES INTRODUCED ONTO OIL SHALE WASTE

doi:10.17521/cjpe.2006.0087

Abstract

Abstract:

Background and Aims Phytoremediation is an important method for restoring bare soil or slag; however, the physiological traits of plants used for revegetation are poorly known, even though such traits are important to successful remediation. This study was carried out on oil shale waste in Maoming City, Guangdong Province to screen for tree species with high photosynthetic potential, appraise the ability of these plants to acclimatize to oil shale waste, and provide valuable information for ecological restoration of similar waste sites.
Methods Diurnal variation of photosynthesis was measured for 12 tree species in summer and winter, using portable photosynthetic equipment (LI-6400, LI-COR, Inc., USA). Other parameters such as transpiration, stomatal conductance, relative humidity, etc. were measured simultaneously, and water use efficiency (WUE) was calculated as net photosynthesis divided by transpiration.
Key Results There were large seasonal differences in all parameters, with values of net photosynthesis, transpiration, and stomatal conductance higher in summer than winter (60.9%, 77.7% and 85.7%, respectively), but WUE higher in winter than in summer (26.8%-77.2%). Diurnal variation of net photosynthesis also exhibited seasonal differences. Many tree species exhibited a bimodal peak in summer and a unimodal peak in winter; however, Cinnamomum camphora was unimodal in both seasons; Terminalia bellirica, Tristania confertam, and Tectona grandis were bimodal in both seasons; and Syzygium cumini was bimodal in winter and unimodal in summer. Trees with higher mean net photosynthetic rate in both winter and in summer should be more useful for phytoremediation than species with high net photosynthetic rate in only one season. Accordingly, net photosynthetic rate, which synthesizes all parameters examined, should be considered the most important parameter to appraise the ability of plants to acclimatize.
Conclusions According to mean net photosynthetic rates in both winter and summer, the sequence of photosynthesis efficiency of the 12 tree species tested was: Acacia auriculiformis, Terminalia bellirica, Cassia siamea, Gmelina arborea, Tectona grandis, Tristania conferta, Cinnamomum camphora, Ormosia pinnata, Ilex rotunda, Syzygium cumini, Peltophorum ptetocarpum and Pterygota alata.

Key words: Diurnal variation of photosynthesis, Net photosynthetic rate, Water utilization efficiency, Gas exchange, Oil shale waste

HUANG Juan, WU Tong, KONG Guo-Hui, CHEN Zhi-Dong, ZHANG Jin-Zhong. SEASONAL CHANGES OF PHOTOSYNTHETIC CHARACTERISTICS IN 12 TREE SPECIES INTRODUCED ONTO OIL SHALE WASTE[J]. Chin J Plant Ecol, 2006, 30(4): 666-674.

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https://www.plant-ecology.com/EN/Y2006/V30/I4/666

Figures/Tables 6

References 17

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环境参数 Variables	夏季(8月中旬) Summer (Middle of August)	冬季(12月下旬) Winter (End of December)
光合有效辐射均值 Mean of phobosynthetically active radiation (PAR) (μmol·m^-2·s^-1)	1 202	697
最大光合有效辐射Maximum PAR (μmol·m^-2·s^-1)	1 966	1 224
气温Air temperature (℃)	35.60+3.29	25.65+4.65
最高气温 Maximum air temperature (℃)	39.76	30.68
空气相对湿度 Relative humidity (%)	55.45	34.49
土壤含水量 Soil water content (%) (Mean±SD)	25.78±0.70	16.55±3.98

环境参数 Variables	夏季(8月中旬) Summer (Middle of August)	冬季(12月下旬) Winter (End of December)
光合有效辐射均值 Mean of phobosynthetically active radiation (PAR) (μmol·m^-2·s^-1)	1 202	697
最大光合有效辐射Maximum PAR (μmol·m^-2·s^-1)	1 966	1 224
气温Air temperature (℃)	35.60+3.29	25.65+4.65
最高气温 Maximum air temperature (℃)	39.76	30.68
空气相对湿度 Relative humidity (%)	55.45	34.49
土壤含水量 Soil water content (%) (Mean±SD)	25.78±0.70	16.55±3.98

植物种类 Species	净光合速率 P_n (μmol·m^-2·s^-1)		水分利用效率 WUE (μmol·mol^-1)		蒸腾速率 T_r (mol·m^-2·s^-1)
植物种类 Species	夏季Summer	冬季Winter	夏季Summer	冬季Winter	夏季Summer	冬季Winter
大叶相思Acacia auriculiformis	16.45±5.25	7.58±2.67	2.71±0.59	8.42±4.18	6.33±2.47	1.33±1.04
油榄仁Terminalia bellirica	15.50±3.87	4.45±1.53	3.60±1.05	2.78±1.25	4.87±2.08	1.99±1.13
铁刀木Cassia siamea	12.86±4.38	5.89±2.23	3.10±0.66	4.70±2.19	4.55±2.11	1.41±0.59
云南石梓Gmelina arborea	12.64±2.95	6.46±1.32	2.65±1.13	9.84±4.89	5.84±2.75	0.92±0.61
柚木Tectona grandis	12.19±4.00	4.51±0.91	2.31±0.61	4.41±1.03	5.88±2.87	1.07±0.26
红胶木Tristania conferta	11.40±3.40	3.40±1.35	2.48±0.53	6.31±3.16	4.80±1.68	0.58±0.22
樟树Cinnamomum camphora	11.28±4.16	2.18±0.84	2.79±0.79	5.47±3.51	4.52±2.21	0.46±0.18
海南红豆Ormosia pinnata	10.23±1.85	2.07±1.18	3.32±0.46	6.52±2.51	3.15±0.80	0.40±0.28
铁冬青Ilex rotunda	10.05±3.56	4.66±1.12	1.98±0.63	3.35±1.09	5.72±2.40	1.46±0.42
海南蒲桃Syzygium cumini	9.49±3.34	5.20±1.92	2.85±1.55	5.38±3.25	4.05±1.84	1.15±0.50
双翼豆Peltophorum ptetocarpum	9.20±3.25	4.70±2.05	2.31±0.79	3.38±0.52	4.67±2.16	1.45±0.68
海南翅苹婆Pterygota alata	8.45±1.82	3.49±1.16	2.98±2.82	4.36±2.06	4.38±2.23	0.90±0.36

植物种类 Species	净光合速率 P_n (μmol·m^-2·s^-1)		水分利用效率 WUE (μmol·mol^-1)		蒸腾速率 T_r (mol·m^-2·s^-1)
植物种类 Species	夏季Summer	冬季Winter	夏季Summer	冬季Winter	夏季Summer	冬季Winter
大叶相思Acacia auriculiformis	16.45±5.25	7.58±2.67	2.71±0.59	8.42±4.18	6.33±2.47	1.33±1.04
油榄仁Terminalia bellirica	15.50±3.87	4.45±1.53	3.60±1.05	2.78±1.25	4.87±2.08	1.99±1.13
铁刀木Cassia siamea	12.86±4.38	5.89±2.23	3.10±0.66	4.70±2.19	4.55±2.11	1.41±0.59
云南石梓Gmelina arborea	12.64±2.95	6.46±1.32	2.65±1.13	9.84±4.89	5.84±2.75	0.92±0.61
柚木Tectona grandis	12.19±4.00	4.51±0.91	2.31±0.61	4.41±1.03	5.88±2.87	1.07±0.26
红胶木Tristania conferta	11.40±3.40	3.40±1.35	2.48±0.53	6.31±3.16	4.80±1.68	0.58±0.22
樟树Cinnamomum camphora	11.28±4.16	2.18±0.84	2.79±0.79	5.47±3.51	4.52±2.21	0.46±0.18
海南红豆Ormosia pinnata	10.23±1.85	2.07±1.18	3.32±0.46	6.52±2.51	3.15±0.80	0.40±0.28
铁冬青Ilex rotunda	10.05±3.56	4.66±1.12	1.98±0.63	3.35±1.09	5.72±2.40	1.46±0.42
海南蒲桃Syzygium cumini	9.49±3.34	5.20±1.92	2.85±1.55	5.38±3.25	4.05±1.84	1.15±0.50
双翼豆Peltophorum ptetocarpum	9.20±3.25	4.70±2.05	2.31±0.79	3.38±0.52	4.67±2.16	1.45±0.68
海南翅苹婆Pterygota alata	8.45±1.82	3.49±1.16	2.98±2.82	4.36±2.06	4.38±2.23	0.90±0.36