• 研究报告 •

### 武夷山不同海拔黄山松新叶和老叶氮磷化学计量特征

1. 1福建师范大学地理科学学院， 福州 350007；2湿润亚热带山地生态国家重点实验室培育基地， 福州 350007）
• 出版日期:2019-03-10 发布日期:2019-03-10

### Nitrogen and phosphorus stoichiometric characteristics of new and old leaves in Pinus taiwanensis at different altitudes in Wuyi Mountain.

FU Zuo-qin1, LYU Mao-kui1, LI Xiao-jie1, REN Yin-bang1, NIE Yang-yi1, DENG Cui1, ZENG Min1, ZHANG Kang-jing1, RUAN Chao-yue1, XIE Jin-sheng1,2*

1. (1College of Geographical Science, Fujian Normal University, Fuzhou 350007, China; 2Key Laboratory for Subtropical Mountain Ecology (Ministry of Science and Technology and Fujian Province Funded),  Fuzhou 350007, China).
• Online:2019-03-10 Published:2019-03-10

Abstract: Foliar nitrogen to phosphorus ratio (N∶P) is widely used as an indicator of soil nutrient availability and nutrient limitation. Therefore, it is necessary to determine the most sensitive plant tissue as the indicator of soil nutrient status. Pinus taiwanensisoccupies a wide range of habitats in the Wuyi Mountain, China. Here, soil, new and old leaves of P. taiwanensis from three altitudes (1100, 1500, and 1900 m a.l.s.) were sampled in Wuyi Mountain. The concentrations of carbon (C), nitrogen (N) and phosphorus (P) as well as δ15N values of soil, new and old leaves were measured. The stoichiometric ratios of C, N and P (i.e. C∶N, C∶P, N∶P) in soil and leaves were calculated, respectively. Results showed that there was no significant difference in soil N availability among different altitudes, while the δ15N of soil and leaves increased with altitude, indicating that N availability for plants increased with elevations. Soil total P and available P concentrations, and P concentration of leaves at 1100 m altitude were lower than those at 1500 and 1900 m altitudes, indicating that the availability of soil N and P may serve as a limiting factor to the growth of P. taiwanensisat low altitude. There was no significant difference in the N and P concentrations and N∶P of the new leaves of P. taiwanensis among different altitudes. There was no correlation between N∶P in new leaves and soil nutrients. However, the variation patterns of N and P concentrations in old leaves were similar to those in soils, and the N∶P ratio in old leaves were closely related to soil nutrients. Our results indicated that old leaves of P. taiwanensis were more sensitive to soil nutrient status than the new leaves along the altitudinal gradient, which is beneficial to exploring the response of plant growth to variation in soil nutrients in the context of future climate change.