Unlock instant, AI-driven research and patent intelligence for your innovation.

Field in-situ determination method of nitrogen monoxide flux directly-discharged by upland field crops

A technique for measuring nitrous oxide and its measurement method, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of immature determination methods, and achieve the effect of simple method, easy operation and accurate measurement results

Inactive Publication Date: 2003-02-05
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in situ determination of N in soil-crop systems in the field 2 O emissions are limited by the immaturity of measurement methods, usually by comparing N in soil-crop systems and bare land. 2 O emission flux to study the role of crops in the system, there is a large error

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Select sorghum plants for field in situ measurement, the specific steps are as follows:

[0017] 1. The basal stems of the sorghum plants in the base were pre-tested and determined not to emit N 2 O's plasticine sticky wrap to protect the plants from damage;

[0018] 2. Cover the soil surface inside the base with a 0.03mm polyethylene film, cut the film close to the base of the plant and bypass it, and then laminate each other. The weight ratio of the film to the base and the junction with the base is 2:1 The mixture of paraffin wax and Vaseline is sealed to block the N on the soil surface 2 O discharge;

[0019] 3. Measured by conventional closed box method, the result obtained is the direct emission of N by sorghum plants 2 The rate of O, and then the flux is calculated by conventional calculation according to the rate.

Embodiment 2

[0021] Choose soybean plant, carry out field in situ determination, differ from embodiment 1 in that:

[0022] The weight ratio of the paraffin wax to the vaseline mixture is 2:1.2, and the thickness of the polyethylene film used is 0.01mm.

[0023] Adopt the present invention to measure different fertilization treatment soybean N in situ 2 Diurnal and seasonal variations in emissions of O, N from soybean 2 O emission varies from -5.0 to 28.8 μgN 2 O-Nm -2 h -1 , with an average value of 5.2 μg N 2 O-Nm -2 h -1 .

Embodiment 3

[0025] Choose corn plant, carry out in situ determination in the field, differ from embodiment 1 in that:

[0026] The weight ratio of paraffin wax and vaseline mixed solution is 2: 1.5, and the thickness of the polyethylene film used is 0.007mm.

[0027] Adopt the present invention to measure different fertilization treatment corn N in situ 2 Diurnal and seasonal variations in emissions of O, N from corn 2 O emission varies from -3.6 to 126.7 μgN 2 O-Nm -2 h -1 , with an average value of 22.8 μg N 2 O-Nm -2 h -1 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invented on-site method for determining the flux of nitrous oxide discharged directly by the dry crop in field includes following steps. (1) The basal stem part of the dry crop plant in the base is stickup wrapped by plasticene, which does not discharge nitrous oxide. (2). The polyethylene film covers the surface of soil in the base, wrapping the basal stem part closely. Moreover, the mixed liquor of paraffin wax and vaseline is used fo r sealing the connectino part between the fil and the base as well as the film and the basal stem part. (3) The rate of discharging nitrous oxide is determined by use of the conventional method of the close type box so as to obtain the flux from the said rate.

Description

technical field [0001] The invention relates to field in-situ measurement technology, in particular to a field in-situ measurement method for directly emitting nitrous oxide flux from upland crops. Background technique [0002] Nitrous oxide (N 2 O) is an important greenhouse gas, and chemical nitrogen fertilizers are represented by N 2 The ratio of O-N loss is higher, and the terrestrial agricultural soil is in N 2 O plays a more important role in emission sources, and N emissions from farmland systems 2 The amount of O can account for 60% of the total anthropogenic emissions. Therefore, regarding the cropland system N 2 The research on O emission has become a hotspot in the field of global environmental change research; however, most of the studies focus on the soil-crop system and explore the effects of fertilization, environmental and climate factors on the N of the system. 2 O emission rate and seek emission reduction measures. Recent research (Chen Guanxiong, Sha...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N33/00
Inventor 陈欣沈善敏张璐
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI