Diurnal Gas Exchange and Superior Resources Use Efficiency of Typical C4 Species in Hunshandak Sandland,China |
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Authors: | Niu SL Jiang GM Li YG Gao LM Liu MZ |
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Institution: | (1) Laboratory of Quantitative Vegetation Ecology, Institute of Botany, The Chinese Academy of Science, 20 Nanxincun, 100093 Beijing, China |
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Abstract: | Net photosynthetic rate (P
N), transpiration rate (E), stomatal conductance (g
s), leaf water potential (ψleaf), leaf nitrogen content, and photosynthetic nitrogen use efficiency (PNUE) were compared between a typical C4 plant, Agriophyllum squarrosum and a C3 plant, Leymus chinensis, in Hunshandak Sandland, China. The plant species showed different diurnal gas exchange patterns on June 12–14 when photosynthetic
photon flux density (PPFD), air temperature (T
air), and water potential were moderate. P
N, E, and g
s of A. squarrosum showed distinct single peak while those of L. chinensis were depressed at noon and had two peaks in their diurnal courses. Gas exchange traits of both species showed midday depression
under higher photosynthetic photon flux density (PPFD) and T
air when Ψleaf was significantly low down on August 6–8. However, those of A. squarrosum were depressed less seriously. Moreover, A. squarrosum had higher P
N, Ψleaf, water use efficiency (WUE), and PNUE than L. chinensis. Thus A. squarrosum was much more tolerant to heat and high irradiance and could utilise the resources on sand area more efficiently than L. chinensis. Hence species like A. squarrosum may be introduced and protected to reconstruct the degraded sand dunes because of their higher tolerance to stress and higher
resource use efficiency.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | adaptation to arid environment Agriophyllum C3 species Leymus photosynthetic nitrogen use efficiency stomatal conductance transpiration rate water use efficiency |
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