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- Title
东北森林两种典型阔叶树种子和幼苗对<sup>15</sup> N 同位素的富集响应.
- Authors
王广臣; 宋 媛; 闫巧玲; 张金鑫
- Abstract
Two typical broadleaved trees (i.e., Fraxinus rhynehophylla and Acer mono) with wind-dispersed seeds in Northeast China were selected in this study. A method of 15N isotope labeling was used to explore the accumulation responses of seeds and seedlings to 15 N-urea soaking concentration (0, 0.05, 0.1 and 0.2 g · L-1), soaking time (4, 8 and 12 days) and leaf stage (2, 4, 6, and 8 leaves). The results showed that 15 N-urea soaking concentration and soaking time had significantly positive effects on 8 N values of seeds, i.e., higher N-urea concentration and longer period of soaking (0.2 g ·L-1 +12 d) were contributed to more N accumulation of seeds. The maximum multiples of N accumulation in F. rhynchophylla seeds and A. mono seeds were observed in 0.1 g · L -1+ (4 d, 8 d) and 0.05 g · L · + (4 d, 8 d), respectively. The loss rate of S,5N values decreased markedly from 2 leaves to 6 leaves and then kept relatively stable with the increasing seedling height, and the total δ15 N values of seedlings started to decline at the stage of 8 leaves. These results suggested that seedlings with 6 leaves were more suitable for tracking seedling source. The δ 15 N values in leaves of seedlings were significantly positively correlated with 15 N-urea concentration leveI. soaking lime and 8 M values of seeds. (Overall, the accumulation of 15 N-urea could he found in seeds and seedlings of F. rhynehophylla and A. mono. The combination of D N-urea concentration (0.1 g · L), soaking time (8 d) and leaf stage (6 leaves) was the most suitable for tracking the seeds and seedlings of these two broadleaved trees.
- Publication
Yingyong Shengtai Xuebao, 2016, Vol 27, Issue 8, p2379
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.201608.030