Indirect determination method for heterotrophic respiratory rate and autotrophic respiratory rate of moso bamboo forest soil

Abstract

The invention relates to the field of determination of soil respiration components in soil ecosystem carbon cycle study and discloses an indirect determination method for the heterotrophic respiratoryrate and the autotrophic respiratory rate of moso bamboo forest soil. The indirect determination method comprises the following steps: (1) selecting a sample plot; (2) determining the soil respiratory rate; (3) collecting a soil sample and determining parameters of the soil sample; (4) establishing a linear relation; and (5) determining related parameters of soil and calculating the heterotrophicrespiratory rate and the autotrophic respiratory rate of the moso bamboo forest soil. According to the invention, five factors are selected and an indirect determination method for heterotrophic respiratory rate and autotrophic respiratory rate of soil is established, a deviation range of a numerical value is relatively small (positive and negative deviations are within 10%) compared with a method commonly used at present and directly determining soil respiration components by utilizing an LI-8100 carbon flux measurement system, and the indirect determination method has the advantages of relatively light field workload, relatively low determination cost and relatively low technical requirements on instrument configuration and operation.

Description

technical field [0001] The invention relates to the field of soil respiration component measurement in soil ecosystem carbon cycle research, and in particular relates to an indirect method for measuring soil heterotrophic respiration and autotrophic respiration rate in Moso bamboo forest. Background technique [0002] Moso bamboo is the main species of bamboo in the subtropical zone of my country, and is an important plantation resource in southern China. The area of ​​moso bamboo forest in China reaches 4.4474 million hectares, accounting for about 36% of the world's moso bamboo forest area. Moso bamboo has the advantages of fast growth and rapid biomass accumulation. Therefore, the moso bamboo forest ecosystem has great advantages in increasing sinks, reducing emissions and coping with global climate change. The study of soil respiration and its changes in Moso bamboo plantation will have far-reaching significance on the global carbon balance. [0003] Soil respiration i...

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Problems solved by technology

[0005] The present invention aims at the poor reliability of estimating the forest soil respiration rate by only using the soil water-soluble carbon content in the prior art and using the direct method to measure the heterotrophic respiration and autotrophic respiration rate of the moso bamboo forest soil, at least 6 months in advance Shortcomings of pretreatment by trenching method, an indirect method for measuring soil heterotrophic respiration and autotrophic respiration rate in Phyllostachys pubescens forest is provided, the method selects soil temperature, soil water content, soil water-soluble organic carbon content, soil microbial biomass carbon content and soil β-glucosidase activity five indicators to indirectly measure the soil heterotrophic respiration and autotrophic respiration rate of Phyllostachys pubescens, the result is reliable, and it is different from the traditional assay method of distinguishing soil respiration components, and the present invention does not need a long time The heterotrophic respiration and autotrophic respiration rate of Moso bamboo forest soil can be directly measured by pretreatment, which is convenient and fast

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