A device and method for simulating the impact of fire disturbance on groundwater in terrestrial ecosystems

Abstract

The invention provides a device and a method for simulating influence of fire disturbance of a surface land ecological system to underground water. The method comprises the following steps of collecting a plurality of soil samples of aridisol by a soil drilling method, and separating obtained undisturbed soil columns into surface layer soil and middle layer soil; after the fire disturbance on the surface layer soil is simulated by a laboratory, sequentially loading the surface layer soil and the middle layer soil into a leaching column according to the order of the undisturbed soil column; using prepared simulated rainwater as a leaching solution, leaching by a continuous flow falling type water intake method, and qualitatively and quantitatively surveying the fine components of the soil leaching water sample. The method has the advantages that the influence of the fire disturbance of the surface land ecological system to the underground water, especially submersible water, can be simulated by a miniature leaching device of the laboratory; the accuracy is higher, the operation is simple and convenient, the cost is low, the controllability is good, the risk to environment is low, the application range is wide, the pertinency is strong, and the method is favorable for evaluating the comprehensive ecological effect of the underground water after the fire disturbance in a fully new view.

Description

technical field [0001] The invention relates to the field of ecology of polluted environment, in particular to a simulation device and method for the impact of surface terrestrial ecosystem fire disturbance on groundwater (diving). Background technique [0002] Fire disturbance is one of the most important disturbances to surface terrestrial ecosystems. According to incomplete statistics, only for forest ecosystems in terrestrial ecosystems, the annual forest fire area in the world reaches 5.3×10 8 ~5.5×10 8 km 2 . In recent years, large-scale terrestrial ecosystem fire accidents have occurred frequently, such as Greater Khingan Mountains in China (2017), Colorado in the United States (2017), Oklahoma in the United States (2017), Fort McMurray in Canada (2016), Major fires such as Palma, Spain (2013). These fires turned a large amount of green land vegetation into ashes in a short period of time, destroyed the original structure and normal functions of the terrestrial ec...

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Problems solved by technology

[0004] However, how to qualitatively and quantitatively monitor and evaluate the impact of fire disturbance on the groundwater (diving) in the surface terrestrial ecosystem has not been well resolved.

This is due to the fact that the terrestrial ecosystems disturbed by fire are mostly forest ecosystems and grassland ecosystems. The geological conditions, vegetation coverage, and water and heat conditions of these ecosystems are relatively complex, and it is difficult to monitor them; Because the groundwater (water) layer in such areas is buried deep, the process of groundwater sampling and direct analysis is relatively difficult.

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