便携式光合作用测定系统仪器误差探析

Study on the instrumental error of the portable photosynthesis system

摘要: 使用各种便携式光合仪测定植物单叶平均光合速率的总误差是由仪器误差、观测误差和叶片本身产生的某些光合反应综合而成。简析了因CO₂、流量、温度、-X压等参数测量所用传感器的精度引起的仪器误差，且该误差因测量方式(开路或闭路)及叶片光合速率水平而异，光合强度越强其误差越小，误差变幅为8％～20％(开路)或2．5％～15％(闭路)。并分析了各测量参数误差对光合速率综合误差的贡献，指出仪器误差主要是由CO₂分析器和流量计误差所致。

Abstract: Combined measurement error of average photosynthesis rate is comprised of the instrumental error．the measurement error and the characteristics of leaf photosynthesis．The instrumental error comes from CO₂ analyzer，flowmeter．temperature thermometer and barometer．The error is different with different measuring methods or leaf photosynthesis rates．The photosynthesis rate is stronger，the error is smaller．The error in open system is about 8％～ 20％，and is about 2．5％～ 15％ in closed system ．The main eror is owing tO CO₂ analyzer and flowmeter．