%0 Dataset
%T Heihe River eco hydrological remote sensing experiment: Li-6400 photosynthetic observation data set in the middle reaches of Heihe River Basin (2012)
%J National Cryosphere Desert Data Center
%I National Cryosphere Desert Data Center(www.ncdc.ac.cn)
%U http://www.ncdc.ac.cn/portal/metadata/cf7f7b44-774d-4af9-a010-603631c23220
%W NCDC
%R 10.12072/ncdc.nieer.db3511.2023
%A Ma mingguo
%A Wang haibo
%K Carbon cycle;ground synchronous observation;evapotranspiration;photosynthetic effective radiation;Li-6400 photosynthetic instrument;vegetation
%X In this data set, Li-6400 photosynthetic instrument was used to observe the main crops wheat and corn in the oasis area in the middle reaches of Heihe River Basin. The observation sites are located in Pingchuan, Linze and Wuxing village, Xiaoman respectively. The observation date starts from mid May to September. This data set includes the original observation data and preprocessed data of Li-6400 for wheat and maize during the observation period.  1) Measurement purpose Photosynthetic data measurement can be used for the study of plant physiological and ecological characteristics and the simulation and verification of eco hydrological models. 2) Measuring instrument and principle Measuring instrument: Li-6400 portable photosynthesis measuring instrument. Measurement principle: the change of CO2 concentration is measured by infrared gas analysis method, and the net productivity of leaves is obtained by measuring the CO2 concentration difference between sample chamber and reference chamber. 3) Measurement time and place Wheat observation site: Linze Pingchuan wheat experimental field Observation time: May 17, 2012 June 8, 2012 to June 13, 2012 Corn observation site: Wuxing village super station Observation time: May 19, 2012 to September 15, 2012 4) Data processing Li-6400 original file is a file in text format, which is converted into excel format. In order to retain the original data, the data is not deleted. During measurement, the data of each period is saved as a file and named after date + type + time, and each leaf is read repeatedly for 3 times; Add a remark to each leaf