[1]宋 浩,满秀玲*,段北星,等.兴安落叶松天然林新老枝叶光合能力及水分利用效率研究[J].南京林业大学学报(自然科学版),2018,42(05):053-58.[doi:10.3969/j.issn.1000-2006.201708003]
 SONG Hao,MAN Xiuling*,DUAN Beixing,et al.A study on new and old branch's leaf photosynthetic capacity and water use efficiency of natural Larix gmelinii forest in the northern Great Xing'an Mountains[J].Journal of Nanjing Forestry University(Natural Science Edition),2018,42(05):053-58.[doi:10.3969/j.issn.1000-2006.201708003]
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兴安落叶松天然林新老枝叶光合能力及水分利用效率研究
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《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

卷:
42
期数:
2018年05期
页码:
053-58
栏目:
研究论文
出版日期:
2018-09-15

文章信息/Info

Title:
A study on new and old branch's leaf photosynthetic capacity and water use efficiency of natural Larix gmelinii forest in the northern Great Xing'an Mountains
文章编号:
1000-2006(2018)05-0053-06
作者:
宋 浩满秀玲*段北星刘家霖
东北林业大学林学院, 黑龙江 哈尔滨 150040
Author(s):
SONG Hao MAN Xiuling* DUAN Beixing LIU Jialing
College of Forestry, Northeast Forestry University,Harbin 150040, China
关键词:
兴安落叶松 光合能力 水分利用效率 分化等级 新枝叶 老枝叶
Keywords:
Larix gmelinii photosynthetic capacity water use efficiency differentiation grade new branch's leaf old branch's leaf
分类号:
S718
DOI:
10.3969/j.issn.1000-2006.201708003
文献标志码:
A
摘要:
【目的】兴安落叶松林是我国大兴安岭地区顶级植被,每年长出的新枝和老枝间有明显的特征差异,而这种差异可能会引起新枝叶和老枝叶光合能力及水分利用效率的差异。笔者探究新枝叶和老枝叶间光合能力的差异,分析兴安落叶松光合能力对环境变化的响应,以准确估算大兴安岭地区顶级群落的光合及水分利用情况。【方法】于2016年6—9月在黑龙江漠河森林生态系统定位研究站对不同分化等级的兴安落叶松新枝叶和老枝叶的光合能力(Pn,max)、蒸腾速率(Tr)、水分利用效率(CWUE)等指标进行测定。【结果】兴安落叶松新枝叶和老枝叶平均Pn,max分别为5.654和3.248 μmol/(m2·s),平均Tr分别为1.291和0.779 μmol/(m2·s),新枝叶Pn,max和Tr分别比老枝叶高74.1%和65.7%。新枝叶和老枝叶平均CWUE分别为5.077 和4.762 μmol/mmol,新枝叶比老枝叶高6.61%。【结论】兴安落叶松林各分化等级间Pn,max、Tr和CWUE均差异不显著(P>0.05); 但新枝叶及老枝叶的Pn,max和Tr均表现为差异极显著(P<0.01),新枝叶和老枝叶平均CWUE则差异不显著(P>0.05),仅6月中旬与其他月份间CWUE差异极显著(P<0.01)。因此,兴安落叶松新老枝叶在光合能力和蒸腾速率上存在较大差异,而水分利用效率的差异较小。
Abstract:
【Objective】Larix gmelinii is the climax vegetation in the northern Great Xing'an Mountains. The pronounced differences between new and old branches may cause significant variations of photosynthetic capacity and water use efficiency. Exploring the difference of photosynthetic capacity between new branch and old branch and the response of photosynthetic capacity of L. gmelinii can definitely help to accurately estimate the photosynthetic capacity and water use efficiency of the climax vegetation in Great Xing'an Mountains.【Method】The leaf photosynthetic capacity(Pn,max), transpiration rate(Tr)and water use efficiency(CWUE)of the new and old branches of different differentiation grade L. gmelinii were examined in the study site of Mohe Forest Ecosystem Research Station from June to September in 2016.【Results】The results showed that the average Pn,max of new and old branches were 5.654 and 3.248 μmol/(m2·s), The average Tr were 1.291 and 0.779 μmol/(m2·s)respectively. The Pn,max and Tr of new branch were 74.1% and 65.7% higher than those of the old branch. The CWUE of new branch was 6.61% higher than that of the old branch with the average values of 5.077 and 4.762 μmol/mmol, respectively. 【Conclusion】The analysis indicated that the differences of Pn,max and Tr between new and old branches were significant(P<0.01). The difference of average CWUE between new and old branches was not statistically significant(P>0.05), although the CWUE in June was significantly(P<0.01)different from those in the other months. Thus, we concluded that the Pn,max and Tr of L. gmelinii between new and old branches exhibited great differences, while the difference of CWUE was much small.

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备注/Memo

备注/Memo:
收稿日期:2017-08-02 修回日期:2018-03-26 基金项目:国家自然科学基金项目(31770488) 第一作者:宋浩(295447600@qq.com)。*通信作者:满秀玲(mannefu@163.com),教授。
更新日期/Last Update: 2018-09-15