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Method for measuring respiration-nitrification-denitrification rates of soil in in-situ manner

An in-situ measurement and soil respiration technology, applied in measuring devices, soil material testing, instruments, etc., can solve the problem that soil respiration cannot be measured in situ at the same time.

Inactive Publication Date: 2016-06-08
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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Problems solved by technology

[0003] Aiming at the problem that existing technologies cannot simultaneously measure soil respiration, nitrification, and denitrification rates in situ, the present invention proposes an in-situ in-situ measurement that can simultaneously perform soil respiration, nitrification, and denitrification rates without disturbing the soil. Flexible time scale, dynamic measurement method

Method used

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  • Method for measuring respiration-nitrification-denitrification rates of soil in in-situ manner
  • Method for measuring respiration-nitrification-denitrification rates of soil in in-situ manner
  • Method for measuring respiration-nitrification-denitrification rates of soil in in-situ manner

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Embodiment Construction

[0051] Construct a closed cavity containing an in-situ soil column in the paddy field, and the cross-sectional area of ​​the soil column in the closed cavity is 314.16cm 2 .

[0052]At 14:23 on August 25, 2015, the suction syringe was inserted into the closed cavity. The pressure in the cavity was measured to be 91070Pa and the temperature was 27.62°C. The pressure is 90039Pa and the temperature is 27.62°C. The volume V of the gas in the closed cavity is calculated by formula (15) = 873.26ml.

[0053] The 10ml gas extracted at 14:23 on August 25, 2015 was measured by gas chromatography:

[0054] N x o y The concentration is 1.49×10 -4 mole m -3 ;

[0055] CO 2 The concentration is 0.058mol·m -3 ;

[0056] o 2 The concentration is 7.49mol·m -3 .

[0057] At 15:23 on August 25, 2015, that is, after an interval of 1 hour, 10ml of gas was extracted from the cavity again, and measured by gas chromatography again:

[0058] N x o y The concentration is 2.42×10 -4 mol...

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Abstract

The invention relates to a method for measuring respiration, nitrification and denitrification rates of soil in an in-situ manner, and belongs to the technical field of ecological systems. The method includes constructing a closed cavity with built-in in-situ soil columns with the sectional areas S; respectively measuring variable quantities delta N<x>O<y>, delta CO<2, total> and delta O<2, total> of gas N<x>O<y>, gas CO<2> and gas O<2> in the closed cavity in time delta t and respectively computing the denitrification rates v<den> of the soil in a unit area, the respiration rates v<res> of the soil in the unit area and the denitration rates v<nit> of the soil in the unit area by the aid of formulas. The method has the advantage that the respiration, nitrification and denitrification rates of the soil can be simultaneously dynamically measured in flexible time scales in the in-situ manner without disturbing the soil or controlling the temperatures.

Description

technical field [0001] The invention relates to a method for measuring soil respiration, nitrification and denitrification rates, in particular to a method for in-situ measurement of soil respiration, nitrification and denitrification rates, and belongs to the technical field of ecosystems. Background technique [0002] Generally, soil respiration, nitrification, and denitrification are considered to be the three main biochemical processes in the soil environment. At present, the measurement methods of soil respiration rate mainly include closed dynamic air chamber method, open dynamic air chamber method, closed static air chamber method, gas chromatography, etc., which can meet the needs of in-situ measurement. The measurement methods of nitrification and denitrification rates mainly include total balance method, NO 3 - depletion method, microelectrode method, 15 N tracer method, BaPS technology, etc., the methods that can meet the simultaneous measurement of nitrificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N33/24
CPCG01N30/02G01N33/24G01N2030/025
Inventor 蒋海波高巧周星梅李娜陈建中
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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