摘要
为提高开顶气室(open-top chamber,OTC)模拟气候变化研究植物生理响应的控制效果,基于前期OTC控制系统基础,对气室结构、控制系统及监测系统改进升级。对改进后的OTC控制系统采集了试验期间5月10月OTC气室内CO2浓度、温度及空气相对湿度实时数据分析模拟效果,结果表明:改进后的OTC控制系统能够控制CO2浓度达到试验预设浓度梯度,在试验期OTC气室内监测的CO2浓度平均值对照组(CK)为369.33μmol·mol^-1,处理1组(TR1)为558.35μmol·mol^-1,处理2组(TR2)为772.71μmol·mol^-1;CO2浓度波动范围TR1组为551.82-572.40μmol·mol^-1,变幅为20.58μmol·mol^-1;TR2组为756.71 779.79μmol·mol^-1,变幅为23.08μmol·mol^-1,满足试验预设模拟要求;气室内不同处理间温度、空气相对湿度差异均不显著(p>0.05)。改进后的OTC控制系统模拟效果好,可用于研究植物响应气候变化的模拟试验。
Background,aim,and scope Enhancement of carbon dioxide(CO2)in the atmosphere has received great attention due to its potential repercussion on global warming and direct effects on the vegetation,especially with a potential increase in atmospheric CO2 level from 400μmol·mol^-1 to 1000μmol·mol^-1 by the end of 21st century according with currents environmental studies.Therefore,development of new technologies on controlled environment conditions are needed to investigate plant response to CO2 enhancements and its possible repercussion on world food security.Among the controlled environment facilities such as the free air CO2 enrichment(FACE),soil-plant-atmosphere research chambers(SPAR),and CO2-temperature gradient chambers(CTGC),the open-top chambers(OTC)are commonly used to control elevated CO 2 concentration for plant science research.In the present study,we aimed to evaluate a modified OTC,designed and constructed based on previous OTC experiences,which provides a precise control of CO2 under different concentrations,with excellent control of air temperature and humidity.Materials and methods Three parts of OTC chamber structure,control system and monitoring system are improved and upgraded.(1)The modified OTC has a regular octagonal prism structure made of plastic steel 4 mm thick high transmittance glass material,an improvement over the previous system.The structure dimensions are 1.08 m length(diagonal),of 2.78 m diameter,and the inner and outer height(top)of 2.55 m and 2.10 m,respectively.(2)The monitoring system consisted of CO2 analyzers,temperature and humidity sensors,and a data acquisition system.(3)The control system is also composed by other features like programmable logic controller,GPRS communication module,a touch screen,a micro-relay,CO2 pressure reducing valves,solenoid valves,perforated windpipes,and CO2 cylinders.The OTC control system automatically collects and uploads data every six minutes using a system control coupled to the PI regulation mode(Proportional integral controller).A line
作者
马亚平
王乃功
贾昊
曹兵
MA Yaping;WAHG Naigong;JIA Hao;CAO Bing(School of Agriculture,Ningxia University,Yinchuan 750021,China;Hebei Qishi Electronics Technology Co.Ltd.,Handan 056004,China)
出处
《地球环境学报》
CSCD
2019年第3期307-315,共9页
Journal of Earth Environment
基金
国家自然科学基金项目(31660199,31160172)~~
关键词
开顶气室
二氧化碳浓度
空气温度
空气相对湿度
open-top chamber
CO2 concentration
air temperature
air relative humidity
