南京林业大学学报(自然科学版) ›› 2018, Vol. 42 ›› Issue (05): 53-58.doi: 10.3969/j.issn.1000-2006.201708003
宋 浩,满秀玲*,段北星,刘家霖
出版日期:
2018-09-15
发布日期:
2018-09-15
基金资助:
SONG Hao, MAN Xiuling*, DUAN Beixing, LIU Jialing
Online:
2018-09-15
Published:
2018-09-15
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。
中图分类号:
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): 53-58.
SONG Hao, MAN Xiuling, DUAN Beixing, LIU Jialing. 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): 53-58.DOI: 10.3969/j.issn.1000-2006.201708003.
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