A novel multipoint measuring system of photosynthetically active radiation

被引：12

作者：

Palva, L

Garam, E

Manoochehri, F

Sepponen, R

Hari, P

Rajala, K

Ruotoistenmaki, H

Seppala, I

机构：

[1] Aalto Univ, Appl Elect Lab, FIN-02015 Helsinki, Finland

[2] Aalto Univ, Metrol Res Inst, FIN-02015 Helsinki, Finland

[3] Univ Helsinki, Dept Forest Ecol, SF-00014 Helsinki, Finland

来源：

AGRICULTURAL AND FOREST METEOROLOGY | 1998年 / 89卷 / 02期

关键词：

multipoint measuring system; photosynthesis; photosynthetically active radiation;

D O I：

10.1016/S0168-1923(97)00058-0

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

A novel multipoint measuring system of photosynthetically active radiation(PAR) has been designed. It is used as a component of a field measurement system of photosynthesis. The system consists of a multichannel fiberoptic sensor, Intel 486-based microcomputer (PC) with software for control and analysis and interface electronics. The fiberoptic sensor comprises 800 measuring points which are arranged in a regular grid on a plane. This grid is attached to a cuvette to observe the spatial and temporal distribution of PAR falling on the needles along with simultaneous measurements of CO2 exchange. PAR is registered through a fiberoptic bundle using a charge coupled device (CCD) sensor. The system has been in operation between July and October 1996 within a Scots pine canopy. The results demonstrate that the obtained regression between the photosynthetic rate estimated with the multipoint PAR measuring system and the measured CO2 exchange rate is as tight within a canopy as in unshaded conditions. (C) 1998 Elsevier Science B.V.

引用

页码：141 / 147

页数：7

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