CO_2 gas-exchange of a whole fores-tree in the field

田间整棵林木的 CO_2 气体交换

• 批准号: 62560146
• 负责人: HAGIHARA Akio
• 金额: $ 1.22万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62560146/
• 关键词: CO_2 gas-exchange; Forest-tree; Field; Photosynthesis; Respiration; Temperature; Illuminance; 単木; 温度係数; 林木個体

This research was conducted on a representative tree within a 13-year-old plantation of hinoki (Chamaecyparis obtusa (S. et Z.) Endl.). The tree height, stem girth at 1.0 m aboveground, and stem volume were respectively 4.9 m, 19.1 cm, and 8.2 dm^3 as of June, 1988. The aboveground part of the forest-tree was enclosed with an assimilation chamber made of polyvinyl chloride films 0.2 mm thick (ca.90% transmissivity of photosynthetically active radiation). Temperature inside the chamber was synclonized with that outside the chamber by means of a temperature controller. CO_2 content in air at the inlet and outlet of the chamber was determined with an infrared gas analyzer. The amount of the air entering the chamber was 60 to 120 m^3 h^<-1> in the daytime, while 10 to 60 m^3 h^<-1> in the nighttime, as measured with a thermal flow meter. Radiation was measured above the crown using a photometric sensor.The respiration rate RT (gCO<@D22@>D2 tree<@D1-1@>D1 h<@D1-1@>D1 of the aboveground part was exponentially related to the temperature T ( C) inside the chamber: R<@D2T@>D2 = R<@D20@>D2.exp(k.T), where R<@D20@>D2 and k are coefficients specific to each month. The Q<@D10@>D2 value ("exp(10.k)) for respiration was in the range from 2.5 to 3.0 during the winter season with the temperature variation of -1.5 to 10.5 C, while from 1.4 to 1.6 during the summer season with the temperature variation of 18 to 30 C. This fact shows that the Q<@D210@>D2 has high values in the winter season than in the summer season. The daily gross photosynthesis was assessed from adding the net gain to the daiuly respiration, which was calculated from considering the above equation of the R<@D2T@>D2 - T relation. The relationship between the daily gross photosynthesis P<@D2g@>D2 (gCO<@D22@>D2 tree<@D1-1@>D1 d<@D1-1@>D1) and the daily illuminance I (klx.h d<@D1-1@>D1) was formulated in the form: 1/Pg =A/2 + B, where A and B are coefficients specific to each month.

本研究以13年生扁柏种植园中的代表性树种为研究对象。et Z.）Endl.）。截至1988年6月，树高、地上1.0 m处的茎围和树干体积分别为4.9 m、19.1 cm和8.2 dm^3。林木的地上部分用0.2 mm厚的聚氯乙烯薄膜（约90%的光合有效辐射透过率）制成的同化室封闭。通过温度控制器使室内温度与室外温度同步。用红外气体分析仪测定了气室进出口空气中的CO_2含量。用热流量计测量，白天进入室内的空气量为60 ~ 120 m^3 h^<-1>，夜间为10 ~ 60 m^3 h^<-1>。用光度传感器测量树冠上的辐射，地上部分的呼吸速率RT（gCO&lt;@D22@&gt;D2 tree&lt;@D1 -1@&gt;D1 h&lt;@D1-1@&gt;D1）与室内温度T（C）呈指数关系：R&lt;@D2T@&gt;D2 = R&lt;@D20@&gt;D2.exp（k.T），其中R&lt;@D20@&gt;D2和k为各月份的系数。在冬季，温度变化范围为-1.5 ~10.5 ℃，呼吸作用的Q&lt;@D10@&gt;D2值（“exp（10.k））在2.5 ~ 3.0之间;在夏季，温度变化范围为18 ~ 30 ℃，呼吸作用的Q&lt;@D10@&gt;D2值在1.4 ~ 1.6之间。这一事实表明，Q&lt;@D210@&gt;D2在冬季比在夏季具有高值。通过考虑上述R&lt;@D2T@&gt;D2 - T关系式计算出的每日呼吸量加上净增益，估算每日总光合作用。日总光合作用P&lt;@D2g@&gt;D2（gCO&lt;@D22@&gt;D2树&lt;@D1 - 1@&gt;D1 d&lt;@D1-1@&gt;D1）与日光照度I（klx. h d&lt;@D1-1@&gt;D1）的关系式为：1/Pg =A/2 + B，其中A和B为各月特有系数。

项目成果

Paembonan, Samuel Arung: "Seasonal trends of the nighttime respiration of a hinoki tree" Trans. Mtg. Chubu Br. Jpn. For. Soc.37. (1989)

Paembonan，Samuel Arung：“扁柏树夜间呼吸的季节趋势” Trans。

萩原秋男: 日林論. 99. 365-366 (1988)

萩原昭夫：日本森林理论。99. 365-366 (1988)

Hagihara, Akio: "On the estimation of photosynthetic production by forest canopies" Jpn. J. Ecol.37. 123-132 (1987)

萩原昭夫：“关于森林冠层光合作用产量的估算”Jpn。

萩原秋男: 日林論.

萩原昭夫：日本林理论。

萩原秋男: 日生態会誌. 37. 123-132 (1987)

Akio Hagiwara：日本生态学会杂志 37. 123-132 (1987)。