Table 3. Comparison of mean physiological and growth parameters of Haloxylon ammodendron and Calligonum mongolicunl before and after irrigation with intervals of 1, 4 and 12 weeks.
| Species | Parameters | 1 week | 4 weeks | 12 weeks | |||
|---|---|---|---|---|---|---|---|
| Before irrigation | After irrigation | Before irrigation | After irrigation | Before irrigation | After irrigation | ||
| H. ammodendron | Ψpd (MPa) | -3.69C | -3.60b | -3.85B | -3.77ab | -4.30A | -3.93a* |
| Ψm (MPa) | -5.25B | -5.18b | -5.44B | -5.42ab | -5.77A | -5.68a* | |
| Pn (μ mol CO2 m-2s-1) | 10.24C | 10.76c | 8.92B | 9.93b | 6.29A | 8.17a* | |
| Tr (m mol m-2s-1) | 4.03C | 4.52b | 3.17B | 4.25b* | 2.00A | 3.49a* | |
| WUE (μ mol CO2 mmol H2O) | 2.39A | 2.248a | 2.58A | 2.27a | 3.02B | 2.44a* | |
| Leaf area (cm2) | 15.5c | 5.55b | 2.52a | ||||
| Branch growth rate (mg d-1) | 6.31c | 1.81b | 0.25a | ||||
| C. mongolicunl | Ψpd (MPa) | -1.35C | -1.3b | -1.68B | -1.5ab | -1.93A | -1.67a* |
| Ψm (MPa) | -2.48C | -2.43b | -2.62B | -2.48ab | -2.82A | -2.60a* | |
| Pn (μ mol CO2 m-2s-1) | 13.69C | 15.22c* | 10.9B | 12.74b* | 5.05A | 8.55a* | |
| Tr (m mol m-2s-1) | 4.90C | 4.85b | 3.91B | 4.52b* | 2.49A | 3.33a* | |
| WUE (μ mol CO2 mmol H2O) | 2.72C | 3.23c* | 2.68B | 2.89b* | 2.02A | 2.45a* | |
| Leaf area (cm2) | 21.43c | 11.71b | 2.49a | ||||
| Branch growth rate (mg d-1) | 9.20c | 3.7b | 0.00a | ||||
Notes: the values of 2 weeks interval was between the 1 week and 4 weeks and near the 1 week, 8 weeks interval was between 4 weeks and 12 weeks and near the 12 weeks.
* represents a significant difference (P = 0.05) between before and after irrigation at the same interval; a capital letter indicates a significant difference (P = 0.05) before irrigation at the different intervals; and a lower-case letter indicates a significant difference (P = 0.05) after irrigation at the different intervals.