Culm Age and Rhizome Affects Night-Time Water Recharge in the Bamboo Phyllostachys pubescens.
Culm Age and Rhizome Affects Night-Time Water Recharge in the Bamboo Phyllostachys pubescens.
复制标题
竹龄和根茎影响毛竹夜间水分补给
DOI：
10.3389/fpls.2017.01928
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发表时间：
2017
影响因子：
5.6
通讯作者：
Ye Q
中科院分区：
文献类型：
--
作者：
Zhao X;Zhao P;Zhang Z;Zhu L;Hu Y;Ouyang L;Ni G;Ye Q
竹类植物是唯一的草本植物，具有不同于其他植物的结构和生理特征。然而，夜间用水在竹子中的作用知之甚少，很少被调查。研究了南昆山自然保护区毛竹（Phyllostachys pubescens）幼龄、成熟和衰老3个年龄层次的茎流对竹龄和根茎结构的昼夜响应。结果表明，树干液流密度和全树导水率随树龄的增加而降低。根状茎切断后，白天树干液流和夜间水分补给量明显减少。另外，在正常衰老竹种中，夜间补水占日蒸腾总量的比例最大，可达30%。因此，本研究表明，连接的根茎系统和夜间水分补给在竹子白天和夜间的水分补偿中发挥了重要作用。夜间水分补给对衰老竹类尤其重要，因为整株导水率较低，蒸腾作用较弱，因此，它们更依赖夜间水分补给来满足全天的水分消耗需求。
Bamboo species—the only herbaceous trees—have unique structural and physiological characteristics that differ from those of other tree taxa. However, the role of night-time water use in bamboo is poorly understood and has rarely been investigated. We studied the day- and night-time sap flow response to culm age and rhizome structure in three age levels (juvenile, mature, and senescent) of Phyllostachys pubescens growing in the Nankun Mountain Natural Reserve, South China. We found that sap flow density and whole-tree hydraulic conductance decreased with culm age. After cutting of rhizome, the day-time sap flow and night-time water recharge decreased obviously. In addition, night-time water recharge accounted for the largest proportion (up to 30%) of total daily transpiration in normal senescent bamboos. Therefore, our study indicates that the connected rhizome system and night-time water recharge played a significant role in water compensation during the day and at night in bamboos. Night-time water recharge is especially critical to senescent bamboos, given their weaker transpiration due to the lower whole-tree hydraulic conductance, and consequently, they are more dependent on night-time water recharge for fulfilling their whole-day water consumption needs.
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影响因子：
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