Experimental study on utilization of remote sensed data for assessing ecophysiological condition of vegetation

利用遥感数据评价植被生态生理状况的实验研究

• 批准号: 09556031
• 负责人: OHTE Nobuhito
• 金额: $ 4.1万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09556031/
• 关键词: remote sensing for vegetation; spectral reflectance; photosynthesis; transpiration; stomatal conductance; canopy conductance; visible and near infrared; far infrared; リモートセンシング; 植物生理; 植物生態; H_2O・CO_2交換; 群落構造

In order to establish the methodology for assessing ecophysiological conditions of vegetation using remote sensing technique, field and laboratory experiments were conducted to clarify the relationship between characteristics of photosynthetic behavior and properties of spectral reflectance in leaf and canopy scale. The field experiments were conducted at the Kiryu Experimental watershed in Shiga prefecture and the Akoh experimental site in Hyogo prefecture. Multi-seasonal CO_2/H_2O flux observations were carried out using eddy correlation method with various micro meteorological measurements in the Kiryu sites. Based on the experimental results in this observation, a big leaf type numerical model describing the CO_2/H_2O exchanges between canopy and atmosphere was developed, The model could reasonably estimate the seasonal variations of heat, vapor and CO_2 fluxes, and could calculate the annual assimilation rate of forest stands. The flux observations in the Akoh site were conducted focusing on the influences of canopy structure. The model developed for this experiments can predict the vertical distributions of radiation, wind speed, heat, CO_2 and H_2O fluxes. The laboratory experiments were operated on several broad-leaf evergreen trees planted in pots using a high-resolution multi-spectral meter and a portable photosynthesis meter. The results shows that the NDVI derived from spectral reflectance of leaves did not always correspond to photosynthetic behaviors, This suggests that utilization of the far infrared reflectance as a surface temperature index is required to sense remotely the real-time responses of photosynthesis even for individual leaf scale.

为了建立利用遥感技术评价植被生理生态条件的方法，通过野外和室内试验，研究了叶片和冠层光谱反射特性与光合行为特征之间的关系。在滋贺吉柳实验流域和兵库县阿古实验场进行了田间试验。利用涡动相关方法对吉柳站的多季CO_2/H_2O通量进行了观测。根据本次观测的实验结果，建立了描述林冠与大气之间CO2/H2O交换的大叶型数值模型，该模型能够合理地估计热量、水汽和CO2通量的季节变化，并计算林分的年同化率。在Akoh站点进行通量观测，重点是冠层结构的影响。该模式能较好地预报辐射、风速、热量、CO_2和H_2O通量的垂直分布。利用高分辨率多光谱仪和便携式光合仪对盆栽万年青树进行了室内试验。结果表明，由叶片光谱反射率反演的NDVI并不总是与光合行为相对应，这表明需要利用远红外反射率作为地表温度指标来遥感光合作用的实时响应，即使是单个叶片尺度。

项目成果

Kosugi, Y.etal.: "Determining factors of ranges of water-use efficiency, net assimilation" J.Japan Soc.Hydrol & Water Resour.10(1). 32-43 (1997)

Kosugi, Y.etal.：“水利用效率、净同化范围的决定因素”J.Japan Soc.Hydrol

Kosugi, Y., A.Nakamura, K.Tanaka and S.Kobashi: "Characteristics of CO2 and H2O Fluxes of leaves of trees under different seasonal and soil moisture conditions in a buffer green zone" J.Jap.Soc.Reveget.Tech.22(3). 168-180 (1997)

Kosugi, Y., A.Nakamura, K.Tanaka 和 S.Kobashi：“缓冲绿带中不同季节和土壤湿度条件下树叶的 CO2 和 H2O 通量特征” J.Jap.Soc.Reveget.Tech

Kosugi,Y.etal.: "Charaeteristics of CO_2 and H_2O Fluxes of leaves of Trees under" J.Japan.Soc.Reveget.Tech.22(3). 168-180 (1997)

Kosugi，Y.etal.：“树木叶子的CO_2和H_2O通量特征”J.Japan.Soc.Reveget.Tech.22(3)。

Kosugi,Y.et al.: "Differences between decidueus and everaveen broad-leaf trees" J.Japan Soc.Reveget.Tech. 22(4). 205-215 (1997)

Kosugi,Y.et al.：“落叶阔叶树和常绿阔叶树之间的差异”J.Japan Soc.Reveget.Tech。

Kosugi, Y., S.Shibata, K.Matsui and S.Kobashi: "Differences between deciduous and evergreen broad-leaved trees in the pattern of seasonal change of leaf-scale photosynthetic net assimilation rate and transpiration rate." J.Jap.Soc.Reveget.Tech.22(4). 205-

Kosugi，Y.，S.Shibata，K.Matsui 和 S.Kobashi：“落叶阔叶树和常绿阔叶树在叶尺度光合净同化率和蒸腾率季节变化模式上的差异。”