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A method for differentiating biological soil crusts from their subsoil basal respiration

A bio-soil and basic respiration technology, applied in soil material testing, material inspection products, etc., can solve the problem that the contribution rate of carbon release cannot be realized, and achieve the effect of accurate distinction, accuracy assurance, and thorough separation

Active Publication Date: 2016-09-07
NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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Problems solved by technology

However, continuous and accurate determination of the contribution rate of biological soil crusts to arid and semi-arid carbon release under field conditions is still not possible due to reasons such as experimental techniques, experimental methods, and experimental costs.

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  • A method for differentiating biological soil crusts from their subsoil basal respiration
  • A method for differentiating biological soil crusts from their subsoil basal respiration

Examples

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Effect test

example 1

[0027] Example 1: Determination of soil respiration of different components of biological soil crust cover soil under dry conditions:

[0028]From April to October in 2011 and 2012, the soil respiration of different components of biological soil crust cover soil was measured under dry conditions. The method for measuring the diurnal variation of soil respiration under dry conditions is as follows. The diurnal variation is selected under the conditions of sunny weather, no rainfall, and the moisture content of 0-10cm soil mass < 5%. Measurements are carried out between 7:00-23:00, once every 2 hours; seasonal (spring, summer, autumn) change soil respiration calculation method, the method of cumulative calculation of each daily change soil respiration volume; annual average and inter-annual soil respiration Calculation, using the method of cumulative calculation of soil respiration in each season. Soil respiration rate was measured using a Li-6400-09 soil respiration chamber (L...

example 2

[0029] Example 2: Determination of soil respiration of different components of biological soil crust covering soil under wet conditions

[0030] From April to October in 2011 and 2012, the soil respiration of different components of biological soil crust cover soil was measured under humid conditions. The measurement method of soil respiration under wet conditions is as follows: when the rainfall is less than 3 mm, the observation is started immediately after the rainfall, and then every 2 hours, until the soil respiration rate returns to the level before the precipitation, the measurement is stopped. For rainfall > 3 mm, observations were started immediately after the end of the rainfall, and observations were made every day at 9:00, 11:00, 14:00, 17:00, and 20:00 until the soil respiration rate returned to the level before the precipitation, and the measurement was stopped. Soil respiration rate was measured using a Li-6400-09 soil respiration chamber (Li-COR, INC, US) to me...

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Abstract

The invention relates to a method for distinguishing biological soil crust and subsoil basic respiration of biological soil to test the contribution of components (biological soil crust and subsoil basic respiration) of soil to the soil respiration. The method comprises the following steps that firstly, a biological soil crust layer is carefully separated from the soil surface and arranged in a screen with 150 meshes, the subsoil of the biological soil crust is heated for 3 h at the high-temperature of 160 DEG C, and after the subsoil temperature recovers to the indoor temperature, the screen with the biological soil crust layer is placed in the soil surface layer. The method has the advantages that operation is easy, separation is carried out through a physical method and is thorough, pollution does not exist, and cost is low; according to the method, the soil water content of components of the soil cannot be changed after natural raining, a processed soil sample testing environment is close to natural conditions, and the accuracy of the test result is high; the interference in soil is small, and the measurement result is close to the real value; continuous monitoring can be carried out under the field condition. By means of the method, the soil respiration rate that the biological soil crust covers the components of the soil can be accurately tested.

Description

technical field [0001] The invention relates to a method for distinguishing biological soil crusts and their underlying soil basic respiration, suitable for the soil respiration contribution of each component of the soil covered by algal crusts, mixed crusts (algae, lichens and mosses) and moss crusts The purpose of this method is to simply and accurately distinguish the soil respiration rate of each component of the soil, and to achieve the requirements of long-term and continuous monitoring in the field, which belongs to the field of ecological technology. Background technique [0002] The role of biological soil crusts in the carbon cycle in desert regions has been widely recognized by researchers. Net carbon fixation (photosynthetic carbon fixation – respiration carbon release) was estimated globally in areas covered by biological soil crusts, showing that biological soil crusts are capable of sequestering 3.9 Pg Cy per year -1 (2.1-7.4 PgCy -1 ), equivalent to 7% of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
Inventor 李新荣赵洋张志山贾荣亮
Owner NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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