In-situ monitoring soil freeze-thawing device and method for testing soil carbon loss on basis of device

Abstract

The invention provides an in-situ monitoring soil freeze-thawing device and a method for testing the soil carbon loss on the basis of the device, and aims at solving the problems that the existing wild method can only be used for monitoring the carbon discharge flux of a whole soil ecological system and cannot be used for monitoring the contribution of a specific soil layer to the carbon discharge, and a soil freeze-thawing process cannot be really reflected by indoor freeze-thawing simulation experiments. The soil freeze-thawing device mainly comprises a temperature monitoring instrument, a soil column chamber, an air buffer chamber, a rubber sleeve and an air guide pipe. The method for testing the soil carbon loss comprises the following steps of charging in-situ soil columns of different soil layers into the soil column chamber of the freeze-thawing device; burying the soil columns into corresponding oil layers; in a freeze-thawing period, monitoring the discharge condition of gases CO2 and CH4, and comparing the soluble organic carbon DOC change condition of the corresponding soil layer before and after the freeze-thawing; further calculating the total carbon loss quantity of the freeze-thawing process. The in-situ monitoring soil freeze-thawing device and the method for testing the soil carbon loss have the advantages that the CO2 and CH4 discharge flux of different soil layers and the change angle of the DOC content in the freeze-thawing process are integrated to calculate the soil carbon loss degree; the precision is improved by 30 to 50 percent.

Description

technical field

[0001] The invention relates to a device for monitoring soil freezing and thawing and a method for measuring soil carbon loss. Background technique

[0002] The alternation of soil freezing and thawing is due to seasonal or diurnal heat changes to form a soil process of repeated freezing and thawing at a certain depth below the topsoil. This phenomenon is very common in soils in middle and high latitudes or high altitudes. The alternation of freezing and thawing changes the soil water and heat conditions and directly affects the biogeochemical cycle of soil elements. The impact of different freeze-thaw patterns on soil biochemical processes may vary greatly, but the degree and biochemical importance of freeze-thaw alternation and its patterns on soil profiles (especially the differences in biochemical processes between topsoil and deep soil) and the nutrient cycle of the entire ecosystem are currently discussed. Sex is still unclear.

[0003] In my country...

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