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当前位置: 首页 > 文章 > 黄土丘陵区铁杆蒿光合特性 林业科学 2007,43 (9) 123-127
Position: Home > Articles > Photosynthetic Characteristics of Artemisia sacrorum in the Loess Hilly Region Scientia Silvae Sinicae 2007,43 (9) 123-127

黄土丘陵区铁杆蒿光合特性

作  者：
步秀芹;徐学选;康博文;郭劲松
单  位：
中国科学院水土保持研究所
关键词：
铁杆蒿;黄土丘陵区;净光合速率;水分利用效率;光合-光响应
摘  要：
Photosynthesis and transpiration of Artemisia sacrorum were studied using the Li-6400 portable photosynthesis system in Loess Plateau region. The results showed that the diurnal variation of net photosynthetic rate (P_n) in A. sacrorum was single-peak curves from June to September. The diurnal variation of P_n was a bimodal curve and photosynthesis got into midday depression at 14:00 in May. The light compensation point (LCP) and the light saturation point (LSP) of A.sacrorum were 44.1 μmol·m~ -2 s~ -1 and 351 μmol·m~ -2 s~ -1 ,respectively. The LCP was higher than that of typical sun plants and the LSP verged on that of typical sun plants. This indicated that A.sacrorum was a sunny and typical sun plant. With PAR increasing, Tr was increasing along and had no saturation peak. When PAR was less than 160 μmol·m~ -2 s~ -1 , the water use efficiency (WUE) of A.sacrorum increased greatly. When PAR varied from 160 to 2 000 μmol·m~ -2 s~ -1 , WUE changed from 2.5 to 3.39 μmol CO_2·mmol~ -1 H_2O. It was proved again that A.sacrorum was a sunny plant.
译  名：
Photosynthetic Characteristics of Artemisia sacrorum in the Loess Hilly Region
作  者：
Bu Xiuqin~ 1,2 Xu Xuexuan~ 1 Kang Bowen~1 Guo Jinsong+1(1.Institute of Soil and Water Conservation,Chinese Academy of Sciences Yangling 712100; 2. Guangxi Research Institute of Environmental Protection Nanning 530022)
关键词：
Artemisia sacrorum; Loess hilly region; net photosynthetic rate; water use efficiency; photosynthesis-light response
摘  要：
Photosynthesis and transpiration of Artemisia sacrorum were studied using the Li-6400 portable photosynthesis system in Loess Plateau region. The results showed that the diurnal variation of net photosynthetic rate (P_n) in A. sacrorum was single-peak curves from June to September. The diurnal variation of P_n was a bimodal curve and photosynthesis got into midday depression at 14:00 in May. The light compensation point (LCP) and the light saturation point (LSP) of A.sacrorum were 44.1 μmol·m~ -2 s~ -1 and 351 μmol·m~ -2 s~ -1 ,respectively. The LCP was higher than that of typical sun plants and the LSP verged on that of typical sun plants. This indicated that A.sacrorum was a sunny and typical sun plant. With PAR increasing, Tr was increasing along and had no saturation peak. When PAR was less than 160 μmol·m~ -2 s~ -1 , the water use efficiency (WUE) of A.sacrorum increased greatly. When PAR varied from 160 to 2 000 μmol·m~ -2 s~ -1 , WUE changed from 2.5 to 3.39 μmol CO_2·mmol~ -1 H_2O. It was proved again that A.sacrorum was a sunny plant.

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