Computer control of carbon dioxide concentration in experimental glasshouses and its use to estimate net canopy photosynthesis
Computer control of carbon dioxide concentration in experimental glasshouses and its use to estimate net canopy photosynthesis
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实验温室中二氧化碳浓度的计算机控制及其用于估计净冠层光合作用的方法
DOI：
10.1016/0168-1923(87)90064-5
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发表时间：
1987
影响因子：
6.2
通讯作者：
D. Harris
中科院分区：
文献类型：
--
作者：
R. Matthews;B. Marshall;R. A. Saffell;D. Harris
介绍了一套由5个实验温室组成的计算机控制系统，用于监测和控制co2浓度。在每栋房子里，二氧化碳浓度由红外气体分析仪测量，通过计算机控制的计量系统注入纯二氧化碳，使其保持在接近环境浓度的水平。浓度测量间隔所需的注入速率通过一种算法计算，该算法使用通风率和以前和当前的二氧化碳浓度作为输入。通风率是根据通风机位置和风速的关系计算出来的，这是以前使用一氧化二氮作为示踪气体进行测量确定的。土壤呼吸是通过倒置在土壤上的容器中苏打石灰的重量增加来测量的。净冠层光合作用估计为考虑其他co2通量后的剩余量。该系统工作可靠，并应用于多种热带作物的净冠层光合作用光响应曲线。
A computer-controlled system for monitoring and controlling the concentration of CO2in a suite of five experimental glasshouses is described. In each house, the CO2concentration, measured using an infra-red gas analyser, was maintained close to the ambient concentration by injecting pure CO2through a metering system controlled by the computer. The required injection rate for the interval between concentration measurements was calculated with an algorithm that used ventilation rate and previous and current CO2concentrations as inputs. Ventilation rate was calculated using a relation based on ventilator position and windspeed, determined previously from measurements using nitrous oxide as a tracer gas. Soil respiration was measured by the gain in weight of soda lime inside a container inverted over the soil. Net canopy photosynthesis was estimated as the residual after the other CO2fluxes had been accounted for. The system worked reliably and was used to obtain light-response curves of net canopy photosynthesis for a number of tropical crops.