Photosynthesis,Transpiration, and Water Use Efficiency of Two Puccinellia Species on the Songnen Grassland,Northeastern China |
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| Authors: | Wang RZ Yuan YQ |
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| Institution: | (1) Laboratory of Quantitative Vegetation Ecology, Institute of Botany, the Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing, 100093, China |
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| Abstract: | The intra- and inter-specific variations in net photosynthetic (P
N) and transpiration (E) rates and water use efficiency (WUE) of Puccinellia tenuiflora and Puccinellia chinampoensis leaves were compared. The two species experienced a similar habitat, but differed in leaf area, leaf colour, and nitrogen contents. Leaf P
N and E for both reproductive and vegetative shoots of the two species declined with leaf age. P
N for reproductive shoots was less than for vegetative shoots, but their E was greater than that of vegetative shoots in the dry season. The average P
N and E for reproductive shoots of P. tenuiflora were lower than those of P. chinampoensis, but higher for vegetative shoots. |
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| Keywords: | intra- and inter-specific variations leaf age net photosynthetic rate plant and water relations |
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