Variations of water use efficiency and its relationship with leaf nutrients of different altitudes of Wuyi Mountains, China

doi:10.13287/j.1001-9332.201707.008

Abstract

Abstract: We determined the water use efficiency and nitrogen and phosphorus concentrations of plants at different altitudes (600, 900, 1300, 1500, 1800, 2000, 2100 m) in Wuyi Mountains to understand the relationship of water use efficiency with foliar nutrients. The results showed that plant water use efficiency increased with altitude, and the leaf δ¹⁸O of tree showed no significant variance with altitude. On the whole, leaf nitrogen concentration showed no obvious trend, while leaf phosphorus concentration at high altitude was significantly higher than that at low altitude. No significant relationship between water use efficiency and foliar nitrogen concentration was found in this study, but water use efficiency had a positive correlation with foliar phosphorus concentration. In conclusion, the change of water use efficiency was mainly caused by the difference in photosynthetic rate. The effect of water status on plant water use efficiency was not significant. The variances of leaf phosphorus concentrations along the altitudinal gradient may affect photosynthetic rate and in turn the water use efficiency of plant in this area.

KONG Ling-lun, LIN Jie, HUANG Zhi-qun, YU Zai-peng, XU Zi-kun, LIANG Yi-fan. Variations of water use efficiency and its relationship with leaf nutrients of different altitudes of Wuyi Mountains, China[J]. Chinese Journal of Applied Ecology, 2017, 28(7): 2102-2110.

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