Observation system and observation method for observing fraction of photosynthetically active radiation and surface albedo of vegetation canopy

Abstract

The invention provides an observation system and an observation method for observing the fraction of photosynthetically active radiation (FPAR) and surface albedo of a vegetation canopy. The observation system is composed of a canopy outer observation node device, a canopy upper observation node device and a canopy lower observation node device, wherein the canopy outer observation node device is mounted on an open space outside a canopy or a bracket on the canopy, the canopy upper observation node device is mounted on a mobile observation platform, and the canopy lower observation node device is mounted on a small bracket near the ground. According to the observation method, a multi-channel radiation measuring device for upward observation is fixed with a bracket, a multi-channel radiation measuring device for downward observation is fixed on the mobile observation platform, and a multi-channel radiation measuring device for upward observation and a multi-channel radiation measuring device for downward observation are fixed with a bracket in positions which are 5-10cm from the ground under the vegetation canopy. Thus, observation of the FPAR and surface albed of vegetations of different spatial resolutions in the same area can be realized to the maximum, and the method makes up for the drawback of the traditional method which cannot realize FPAR and surface albed observation.

Description

technical field [0001] The invention belongs to the technical field of geographic remote sensing observation, and in particular relates to an observation system and method for the photosynthetically active radiation absorption ratio of vegetation canopy and surface albedo. Background technique [0002] The ratio of photosynthetically active radiation absorbed by vegetation to the photosynthetically active radiation reaching the top of the vegetation canopy is called the fraction of Absorbed Photosynthetically Active Radiation (FPAR). FPAR is an important input parameter for inversion of Gross Primary Productivity (GPP) by light utilization rate model, and FPAR can also be used as an indicator of vegetation coverage and change. The common FPAR retrieval method is to use the normalized difference vegetation index NDVI and MODIS Enhanced Vegetation Index (Enhanced Vegetation Index, EVI) to obtain. Within a certain range, there is a linear relationship between FPAR and NDVI. ...

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Problems solved by technology

[0016] In order to overcome the large heterogeneity in the existing technology, the spatial variation characteristics of the surface cannot be well described, especially in the study of the scale effect of surface parameters, multi-scale surface observation parameters cannot be obtained, and remote sensing with different spatial resolutions Observational data matching, so as to carry out the problem of scale effect and scale conversion method research, the present invention provides an observation system and method of vegetation canopy photosynthetically active radiation absorptivity and surface albedo

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