Vegetation canopy transpiration inversion algorithm considering phenological information

A vegetation canopy and inversion algorithm technology, applied in the field of vegetation canopy transpiration inversion algorithm, can solve problems such as stomatal conductance and uncertainty of transpiration estimation results, and achieve the effect of reducing seasonal errors and high estimation accuracy
CN112182882AActive Publication Date: 2021-01-05HOHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HOHAI UNIV
Publication Date
2021-01-05

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Abstract

The invention discloses a vegetation canopy transpiration inversion algorithm considering phenological information, belongs to the technical field of water circulation key parameter quantitative inversion. According to the invention, seasonal leaf area change and phenological rhythm information of a vegetation canopy by utilizing satellite remote sensing vegetation index data. The invention provides a dynamic parameterization method for a stomatal conductance slope parameter in a photosynthetic conductance model. The remote sensing leaf area index (LAI) refers to the growth activity of the vegetation canopy leaf, which indicates that the LAI and the stomatal conductance slope parameter have a good linear relationship in the annual period. The vegetation growth season is divided into a growth period and a fading period by utilizing the LAI time sequence change, and the relationship between the LAI and the stomatal conductance slope parameter is respectively established for different phenological periods, so that the asymmetric response of the stomatal conductance slope parameter to the LAI change can be clearly identified, and the important influence of the phenology on the leaf function is reflected; the result shows that the estimation precision of the nonlinear model on the stomatal conductance slope parameter is higher, and the seasonal error of canopy stomatal conductance and transpiration can be effectively reduced.
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Description

technical field

[0001] The invention belongs to the technical field of quantitative inversion of key parameters of water cycle, and in particular relates to a vegetation canopy transpiration inversion algorithm considering phenological information. Background technique

[0002] Surface evapotranspiration (Evapotransspiration, ET) is the sum of vegetation transpiration, vegetation interception evaporation and soil evaporation, and plays an important role in the exchange of land-atmosphere water and energy. About 60% of the world's precipitation comes from ET, and the evapotranspiration process consumes more than 50% of the energy absorbed by the surface. In the global surface ET, transpiration accounts for about 80%, especially in areas with high vegetation coverage, ET is dominated by vegetation transpiration. Therefore, accurate estimation of vegetation transpiration is the key to ET estimation, and it is of great scientific significance to understand the dynamics and caus...

Claims

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