Chin J Plant Ecol ›› 2012, Vol. 36 ›› Issue (1): 72-80.DOI: 10.3724/SP.J.1258.2012.00072
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SUN Dong-Bao1, WANG Qing-Suo*()
Received:
2011-04-18
Accepted:
2011-10-17
Online:
2012-04-18
Published:
2012-01-05
Contact:
WANG Qing-Suo
SUN Dong-Bao, WANG Qing-Suo. Effects of water on the photosynthetic characteristics of alfalfa (Medicago sativa)[J]. Chin J Plant Ecol, 2012, 36(1): 72-80.
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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2012.00072
Fig. 1 Diurnal courses of original light conversion efficiency (Fv/Fm), net photosynthetic rate (Pn) and transpiration rate (Tr) of Medicago sativa leaf. W0, W1, W2 and W3indicate non-irrigation, irrigation once each crop, irrigation twice each crop, irrigation three times each crop, respectively.
生育期 Growth stage | 处理Treatment | Gs (mol·m-2·s-1) | Pn (μmol·m-2·s-1) | Tr (mmol·m-2·s-1) | 土壤含水量 Soil moisture (%) | |
---|---|---|---|---|---|---|
0-60 cm 0-280 cm | ||||||
再生期 Regeneration stage (2005-6-22) | W0 | 0.168 0d | 7.4d | 7.0b | 9.6d | 10.3d |
W1 | 0.269 4c | 12.0bc | 8.8b | 12.0c | 11.6c | |
W2 | 0.378 9b | 17.1b | 12.1a | 14.2b | 15.2b | |
W3 | 0.441 2a | 22.9a | 12.2a | 19.9a | 18.4a | |
初花期 Early flowering stage (2005-7-23) | W0 | 0.114 2d | 11.0d | 4.4b | 8.2c | 8.0c |
W1 | 0.145 8c | 15.3c | 4.8b | 9.2c | 9.7c | |
W2 | 0.169 5b | 19.2b | 6.0a | 12.3b | 13.1b | |
W3 | 0.181 3a | 21.2a | 6.3a | 18.9a | 17.1a |
Table 1 Mean value of the day in stomatal conductance (Gs), net photosynthetic rate (Pn), transpiration rate (Tr) of Medicago sativa leaf and soil moisture
生育期 Growth stage | 处理Treatment | Gs (mol·m-2·s-1) | Pn (μmol·m-2·s-1) | Tr (mmol·m-2·s-1) | 土壤含水量 Soil moisture (%) | |
---|---|---|---|---|---|---|
0-60 cm 0-280 cm | ||||||
再生期 Regeneration stage (2005-6-22) | W0 | 0.168 0d | 7.4d | 7.0b | 9.6d | 10.3d |
W1 | 0.269 4c | 12.0bc | 8.8b | 12.0c | 11.6c | |
W2 | 0.378 9b | 17.1b | 12.1a | 14.2b | 15.2b | |
W3 | 0.441 2a | 22.9a | 12.2a | 19.9a | 18.4a | |
初花期 Early flowering stage (2005-7-23) | W0 | 0.114 2d | 11.0d | 4.4b | 8.2c | 8.0c |
W1 | 0.145 8c | 15.3c | 4.8b | 9.2c | 9.7c | |
W2 | 0.169 5b | 19.2b | 6.0a | 12.3b | 13.1b | |
W3 | 0.181 3a | 21.2a | 6.3a | 18.9a | 17.1a |
Fig. 2 Fv/Fm-PAR and Pn-PAR response curve of Medicago sativa leaf under different treatments. Fv/Fm, original light conversion efficiency; PAR, photosynthetically active radiation; Pn, net photosynthetic rate. W0, W1, W2 and W3indicate non-irrigation, irrigation once each crop, irrigation twice each crop, irrigation three times each crop, respectively.
Fig. 3 Relationship of original light conversion efficiency (Fv/Fm), net photosynthetic rate (Pn) and transpiration rate (Tr) of Medicago sativa leaf versus soil moisture.
Fig. 5 Relationship between net photosynthetic rate (Pn) and original light conversion efficiency × photosynthetically active radiation (F v/Fm × PAR) of Medicago sativa leaf.
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