Biotic- and abiotic-driven variations of the night-time sap flux of three co-occurring tree species in a low subtropical secondary broadleaf forest.
Biotic- and abiotic-driven variations of the night-time sap flux of three co-occurring tree species in a low subtropical secondary broadleaf forest.
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低亚热带次生阔叶林中三种共生树种夜间树液通量的生物和非生物驱动变化
DOI：
10.1093/aobpla/ply025
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发表时间：
2018-06
期刊：
影响因子：
2.9
通讯作者：
Zhao X
中科院分区：
文献类型：
--
作者：
Wang Q;Gao J;Zhao P;Zhu L;Ouyang L;Ni G;Zhao X
摘要虽然对不同植物品种夜间水分利用的研究已有报道，但在同一地区相同气候条件下的比较研究还很少。本研究旨在分析夜间水分利用的种间和种内变化与环境因子和树木形态特征的关系，以了解和阐明可能的潜在机制。利用Granier型液流传感器对中国南部南亚热带次生阔叶林中3种共生树种的液流进行了监测。除风速外，所有环境因子对木荷、红锥和火力楠的白天液流都有显著影响，但包括风速在内的所有因子对夜间液流的影响都很小。这些结果表明，树干液流主要用于夜间的补水。除树高外，树体形态特征对白天用水量有显著影响，但对夜间用水量影响不显著。研究发现，夜间补给量受最大通量密度的影响较大。主成分分析表明，水分运输的种内变异大于种间变异。光合作用茎种(C.hystrix和M.macclurei)的夜间用水量和夜间/白天百分比(Qn/Qd)均大于非光合作用茎种(S.Superba)。
Abstract Although several studies on the night-time water use of different plant species have been reported, comparative studies under the same climatic conditions of a region are scarce. This study aimed to analyse the inter- and intraspecific variations in night-time water use in relation to environmental factors and to tree morphological features to understand and elucidate the possible underlying mechanisms. The sap flow of three co-occurring tree species in a low subtropical secondary broadleaf forest in South China was monitored using Granier-style sap flux sensors. All examined environmental factors except wind speed exerted significant influence on the daytime sap flows of Schima superba, Castanopsis hystrix and Michelia macclurei, but the impacts of all factors, including wind speed, on the night-time sap flux were trivial. These results indicated that sap flow was mainly used for water recharge at night. The morphological features of the trees, except tree height, significantly affected the daytime water use, but no morphological features significantly affected the night-time water use. We found that night-time water recharge was strongly affected by the maximum flux density. A principal component analysis showed that there were more intraspecific than interspecific variations in water transport. The results also revealed that the night-time water use and the percentage of night/day (Qn/Qd) of photosynthetic stem species (C. hystrix and M. macclurei) were greater than those of non-photosynthetic stem species (S. superba).
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影响因子：
4
作者：
Forster, Michael A.
通讯作者：
Forster, Michael A.
七种树种水通量对蒸气压不足响应的生物物理限制与对比土地利用制度
影响因子：
6.2
作者：
Gao, Jianguo;Zhao, Ping;Ni, Guangyan
通讯作者：
Ni, Guangyan
影响因子：
7.3
作者：
Heroult, Arnaud;Lin, Yan-Shih;Ellsworth, David S.
通讯作者：
Ellsworth, David S.
影响因子：
7.3
作者：
Oren, R;Sperry, JS;Schäfer, KVR
通讯作者：
Schäfer, KVR
影响因子：
4
作者：
Howard, Ava R.;Donovan, Lisa A.
通讯作者：
Donovan, Lisa A.