Kong Ling Lun, Lin Jie, Huang Zhi Qun, Yu Zai Peng, Xu Zi Kun, Liang Yi Fan
College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China.
Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China.
Ying Yong Sheng Tai Xue Bao. 2017 Jul 18;28(7):2102-2110. doi: 10.13287/j.1001-9332.201707.008.
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 δO 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.
我们测定了武夷山不同海拔高度（600、900、1300、1500、1800、2000、2100米）植物的水分利用效率以及氮和磷浓度，以了解水分利用效率与叶片养分之间的关系。结果表明，植物水分利用效率随海拔升高而增加，树木叶片的δO随海拔无显著变化。总体而言，叶片氮浓度无明显趋势，而高海拔地区的叶片磷浓度显著高于低海拔地区。本研究未发现水分利用效率与叶片氮浓度之间存在显著关系，但水分利用效率与叶片磷浓度呈正相关。总之，水分利用效率的变化主要是由光合速率差异引起的。水分状况对植物水分利用效率的影响不显著。沿海拔梯度叶片磷浓度的变化可能会影响光合速率，进而影响该地区植物的水分利用效率。
