METHOD FOR DETERMINING LIGHT COMPENSATION UTILIZATION OF PHALARIS ARUNDINACEA IN PHRAGMITES COMMUNIS AND PHALARIS ARUNDINACEA COMMUNITY

摘要

A method for determining light compensation utilization of Phalaris arundinacea in a Phragmites communis and Phalaris arundinacea community, comprising the following steps: selecting Phalaris arundinacea under Phragmites communis canopies in an active growth stage in the Phragmites communis and Phalaris arundinacea community; performing light response curve fitting on Phalaris arundinacea leaf blades by using an artificial light source, and separately testing the illumination intensity of a surface layer of the Phalaris arundinacea and the illumination intensity of the Phalaris arundinacea in an environment where there is no shelter around; and then, calculating a net photosynthetic rate of the Phalaris arundinacea under the two illumination intensities and the ratio of the two illumination intensities according to a light response curve of the Phalaris arundinacea, so as to estimate the light compensation utilization rate of the Phalaris arundinacea under the Phragmites communis canopies, such that an appropriate density of the Phragmites communis in the Phragmites communis and Phalaris arundinacea community can be determined. This method is simple and easy, renders accurate and stable data, and can be used in determining of light compensation utilization of plants under community canopies having vertical distribution characteristics.