Development of a measurement system of whole-tree gas-exchange

全树气体交换测量系统的研制

• 批准号: 05556023
• 负责人: HAGIHARA Akio
• 金额: $ 2.94万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05556023/
• 关键词: Hinoki; Photosynthesis; Size-dependence; Transpiration; Water use efficiency; 水利用効率; 立木光合成蒸散測定装置; チャンバー法; 外気同調; 立木光合成・蒸散測定装置; 除湿制御; 単木葉量

A field-system for measuring the whole-tree gas-exchange of CO_2and H_2O was developed. We compared transpiration rates on a leaf area basis of a hinoki (Chamaecyparis obtusa) tree 6.2 m high measured with the system to those measured with a porometer, so that it is concluded that the system is nearly the same as the porometer both in accuracy and response.Photocynthesis and transpiration were measured on five sample trees in a 20-year-old hinoki stand over one year using the system. Photosynthesis and transpiration were closely related to each other, i.e., photosynthesis increased with increasing transpiration. Water use efficiency was low in March to August when physiological activity of trees was high, whereas high in other months. The water use efficiency was different not only months, but also among sample trees. There existed a clear size-dependence of the transpiration rate of a tree to the square of stem girth at the bottom of the crown, which is in turn closely related to the foliage area of the tree. The relationship was approximated by the power function.

研制了一套CO_2和H_2O全树气体交换现场测量系统。用该系统对一株6.2m高的扁柏（Chamaanoparis obtusa）进行了一年多的光合作用和蒸腾速率的测定，结果表明，该系统在精度和响应上与气孔计基本一致。光合作用和蒸腾作用密切相关，光合作用随蒸腾作用的增加而增加。水分利用效率在3 ~ 8月生理活性高的月份较低，其它月份较高。水分利用效率不仅月份不同，而且样木间也存在差异。蒸腾速率与冠底干围的平方存在明显的大小相关性，而冠底干围的平方又与树木的叶面积密切相关。该关系由幂函数近似。

项目成果

Yokota, T.: "Photosynthesis and transpiration of individual hinoki cypress (Chamaecyparis obtusa) tree, Trans." Jpn.For.Soc.106 (in press). (1995)

Yokota, T.：“单个扁柏 (Chamaecyparis obtusa) 树的光合作用和蒸腾作用，Trans。”

Hagihara,A.: "On the Size-Dependence curve as a generalized Competition-Density curve" J.Jpn.For.Plann.24. 15-23 (1995)

Hagihara,A.：“关于作为广义竞争密度曲线的规模依赖性曲线”J.Jpn.For.Plann.24。

Tanaka,T.: "Comparison between water absorption rate and sap-flow rate measured using the improved stem heat-balance method" J.Jpn.For.Soc.76. 500-505 (1994)

Tanaka,T.：“使用改进的茎热平衡方法测量的吸水率和液流率之间的比较”J.Jpn.For.Soc.76。

Yokota,T.: "Maintenance and growth respiration of the aboveground parts of young hinoki cypress under field conditions" Tree Physiol.15(in press). (1995)

Yokota,T.：“田间条件下年轻扁柏地上部分的维护和生长呼吸”Tree Physiol.15（印刷中）。

Hagihara, A.: "On the Size-Dependence curve as a generalized Competition-Density curve" J.Jpn.For.Plann.24. 15-23 (1995)

Hagihara, A.：“关于作为广义竞争密度曲线的规模依赖性曲线”J.Jpn.For.Plann.24。