Flooded marsh plant ecological water demand calculation method based on in-situ evapotranspiration monitoring

Abstract

The invention discloses a flooded marsh plant ecological water demand calculation method based on in-situ evapotranspiration monitoring, relates to a flooded marsh plant ecological water demand calculation method and aims at solving the technical problems that in an existing ecological water demand estimation method, the demands for continuous ecological function indexes and hydrological series data of wet land are large, and model parameters are more and difficult to determine, and especially in a hierarchical calculation method, the dependency on basic data information such as ecological system composition and properties is high, and weight assignment is difficult. The method comprises the steps that 1, the everyday evapotranspiration amount of a flooded marsh plant in an evaporation barrel is monitored and recorded in the whole growing season; 2, the annual ecological water demand of the flooded marsh plant to be measured is calculated. According to the method, the evaporation barrel can be arranged for various wetland plant types at all kinds of the plant coverage to achieve ecological water demand monitoring estimation of partition units. The method is applied to calculation of the flooded marsh plant ecological water demand.

Description

Technical field: [0001] The invention relates to a method for calculating the ecological water demand of flooded swamp plants. Background technique: [0002] Wetland is a unique ecosystem formed by the interaction of water and land on the earth. It is the ecological landscape with the richest biodiversity in nature and one of the most important living environments for human beings. It has huge functions and values. However, due to the double impact of climate change and human activities, the area of ​​wetlands has decreased sharply and their functions have been seriously degraded. Protection of existing wetlands, restoration of degraded wetlands and rational use of wetlands have become the most effective means to exert ecological, social and economic benefits of wetlands. Estimating the water demand of wetland ecological environment is an urgent problem to be solved in wetland ecology and environmental protection, and it is also a requirement for rational allocation of wate...

AI Technical Summary

Problems solved by technology

[0003] The ecological curve method mainly uses the historical monitoring data of the wetland to establish the relationship curve between the water volume of the wetland and the corresponding ecological indicators (vegetation area, water surface area, etc.). Significant changes have taken place, and the amount of water at the inflection point should be considered as the minimum amount of water required to maintain the dynamic balance of the wetland ecosystem. The ecological curve method fully considers the ecological environment function of the wetland, and fully reflects the correlation between the ecological state index and the water amount. The disadvantage is that a large number of continuous ecological function index series data and corresponding hydrological data are required. For my country, the number of wetland ecosystems with both ecological data and natural hydrological data is quite small, so this method is practical for many wetlands. It is very difficult and the scope of application is also small

Based on RS images, RS and GIS technology methods apply RS image interpretation analysis and GIS spatial analysis to obtain the parameters required for wetland ecological water demand calculation or wetland related spatial data (such as vegetation distribution information, wetland depression distribution, etc.) , to calculate the minimum amount of water required for wetland ecological dynamic balance. This method can obtain the spatial attribute data of the protected object and solve the problem of insufficient data. However, there are uncertainties in RS data and other spatial data scales in RS and GIS technical methods. Incompatibility and other issues

The hydrological model simulation method is based on the research of wetland eco-hydrological process, taking the interaction between hydrology and ecology and their response process as the simulation object, and constructing an eco-hydrological model to calculate the ecological water demand. In the hydrological model simulation method, the eco-hydrological process itself is extremely complex , not only to simulate the hydrodynamic process, but also to describe the migration and transformation of various chemical substances in the region or water body, and to study the hydrological mechanism of the ecological process, which involves many physical, chemical and biological processes, and the ecological hydrological process has obvious Regionality, various influencing factors, and complex interaction mechanisms will inevitably lead to the complexity of most parameters of the model, and the acquisition of data and the determination of a large number of parameters also bring difficulties to the application of ecohydrological models. At present, only some mature foreign ecohydrological models are used in China. Model to calculate, weak applicability

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