Wetland vegetation carbon sequestration rate prediction method based on relation between key water regimen variables and vegetation carbon sequestration rates

Abstract

The invention discloses a wetland vegetation carbon sequestration rate prediction method based on the relation between key water regimen variables and vegetation carbon sequestration rates. The method comprises the following steps: S1, carrying out remote sensing estimation on the wetland vegetation carbon sequestration rate based on a remote sensing observation vegetation index EVI time sequence image; s2, calculating hydrological variables of wetland flooding duration, flooding depth, flooding frequency and flooding starting and ending time with important significance on wetland vegetation according to the observed water level data and a digital terrain elevation model (DEM); s3, calculating a response curve of the vegetation carbon sequestration rate to each hydrological variable by using a Gaussian mixture model, and obtaining a key water regimen variable with the highest interpretation degree on the wetland vegetation carbon sequestration rate; s4, predicting the wetland vegetation carbon sequestration rate after the key water regimen variables are changed by comparing the key water regimen variables in the prediction stage with the key water regimen variables in the observation stage. The method is suitable for a wetland ecosystem with relatively high water level variation amplitude, wherein the system has relatively small actual measurement data of ground carbon stock and a dominant effect of water regimen on vegetation; and the method is simple and convenient to operate and convenient to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of wetland auxiliary estimation, in particular to a method for predicting wetland vegetation carbon sequestration rate based on the relationship between key water regime variables and vegetation carbon sequestration rate. Background technique [0002] The carbon fixed by wetland plants through photosynthesis, that is, plant biomass carbon, is the main carbon input in the process of carbon sequestration in wetland ecosystems. The cumulative growth of wetland vegetation carbon stock per unit time, that is, the carbon sequestration rate of wetland vegetation, directly reflects the carbon sink status of wetland ecosystems, and is the main factor concerned in the regulation of wetland ecological processes. Hydrological conditions are the main controlling factors affecting vegetation in wetland ecosystems, and multiple water regime variables, including flooding depth and flooding duration, have an important impact...

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Problems solved by technology

[0003] Although some studies have developed methods for estimating vegetation carbon sequestration rates in large-scale wetlands using remote sensing methods, the estimation of wetland vegetation carbon sequestration rates based on remote sensing methods often requires ground-based measurement of vegetation carbon stock data for calibration and verification.

However, the ground observation sequence of carbon stock is often short. Therefore, in the period when there is no ground carbon stock observation data, it is difficult to use remote sensing to estimate the carbon sequestration rate of wetland vegetation. Mechanism assessment of long-term effects of rate

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