Plant water utilization efficiency evaluation method based on evapotranspiration component

Abstract

The invention relates to a plant water utilization efficiency evaluation method based on evapotranspiration components, and belongs to the field of model application and analysis evaluation in ecological hydrology. The input data required by the model is mainly meteorological data (namely precipitation, maximum temperature and minimum temperature), and a long-term continuous observation data set exists in most regions, so that the model is less limited by a data source. And the model can be simulated on a regional large scale, the space-time limitation of a traditional evapotranspiration and WUE monitoring method can be overcome, time and labor are saved, and the cost is low. The model output result corresponds to the land utilization type and the vegetation type input by the model, and the method can also be used for evaluating the plant water utilization efficiency under different plant types or land utilization modes, such as grassland, evergreen broad-leaved forest, deciduous broad-leaved forest and the like.

Description

technical field [0001] The invention belongs to the field of model application and analysis and evaluation in ecological hydrology, and particularly relates to a plant water use efficiency evaluation method based on evapotranspiration components. Background technique [0002] Water Use Efficiency (WUE) is the amount of substances that plants can assimilate per unit of water consumption, and it reveals the dynamic balance between the carbon sequestration capacity and water consumption of the ecosystem, as well as the response and adaptation strategies of vegetation to climate change. It is of great significance to study the carbon-water coupling mechanism of terrestrial ecosystems; it is also an important indicator for evaluating plant drought tolerance, that is, under the same conditions, plants with higher WUE have stronger drought tolerance. Plant WUE can be calculated by the ratio of plant net photosynthetic rate (NPP) to transpiration rate. Therefore, changes in transpir...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is how to provide a method for evaluating plant water use efficiency based on evapotranspiration, so as to solve the lack of consideration of the overall regional ecosystem in the prior art, and the evaluation indicators are relatively complicated, and have not reached unity. Considering the relative contribution rate of E and T to the overall ET, etc.

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