A gas headspace sampling device for root-soil systems of tall plants

Abstract

The ecosystems such as farmland, forests, grassland and the like are important sources of greenhouse gases such as CO2, CH4, N2O and so on. Accurate and rapid determination of the flux and concentration of the greenhouse gases in various ecosystems has important practical significance in research of global climate change and impact thereof. The invention provides a gas headspace sampling device suitable for root-soil systems of high stalk plants, modular splicing and water closing connection are adopted, increase of a top box and sealing tedious operation between the top box and a plant are avoided, excellent air impermeability is guaranteed, meanwhile, integrated collection of the greenhouse gases by the root-soil systems of the high stalk plants is realized, and the determination result is truer and more reliable. The system provided by the invention is compact, reasonable and simple in structure and easy in operation, scientific and reasonable design is supplied for manual observation of greenhouse gas flux of the root-soil systems of the high stalk plants (such as corn, oilseed rape, fruit trees and the like), and the gas headspace sampling device has relatively great popularization and application value in the atmospheric environment research field.

Description

technical field [0001] The invention belongs to the field of atmospheric environment research, and relates to a root-soil system gas sampling device, in particular to a gas headspace sampling device suitable for the root-soil system of tall plants. Background technique [0002] With the development of society, global climate change, which is mainly characterized by temperature rise and precipitation pattern change, has become an indisputable fact. Atmospheric CO 2 、CH 4 , N 2 The increase in the content of greenhouse gases such as O will inevitably aggravate global climate change, bring huge challenges to the survival and development of human society, and seriously threaten the sustainable development of human survival and social economy. It has become a major environmental issue of global concern. Ecosystems such as farmland, forests, and grasslands are CO 2 、CH 4 , N 2 O and other important sources of greenhouse gases, accurate and rapid monitoring of the flux and co...

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Problems solved by technology

[0005] However, in actual operation, there are many problems in the sampling box used in the conventional static box method, which are mainly manifested in the following aspects: first, the air leakage problem-the conventional static box method needs to set PVC pipes on the plant stalks and place them on the top There are holes in the box for the stems of the plants to protrude, and the sealant is used to combine the PVC pipe with the top box. The airtightness is poor, resulting in air leakage after the box is closed, and the representativeness of the extracted gas is insufficient, resulting in poor sampling representativeness and large measurement errors; Second, the conventional static box cannot be buckled directly above the root system of the plant, it can only be measured on the side of the plant or between the rows, and can only buckle the lateral roots and fibrous roots, which cannot fully represent the root-soil system of the plant; third, the conventional static box buckle Boxes and boxes are inconvenient, and may cause damage to plant growth; Fourth, conventional static boxes are only suitable for dwarf or some high-stalk plants (such as corn, etc.). Determination of gases, and cannot measure the greenhouse gas emission (or absorption) of larger plants (such as trees, etc.) root-soil system

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