Phương pháp phân tích khí hồng ngoại buồng tĩnh kín và ứng dụng trong việc xác định lượng carbon phát thải qua hô hấp đất tại rừng ngập mặn Cần Giờ

2021 ◽  
pp. 104-111
Author(s):  
Nguyễn Thái Sơn
Keyword(s):  
Chamber Method ◽  
Dynamic Chamber

Nghiên cứu hô hấp đất là một hướng nghiên cứu có đóng góp quan trọng vào việc đánh giá khả năng trao đổi và tích trữ Carbon (C) của hệ sinh thái rừng. Sự phát thải C của hệ sinh thái thông qua quá trình hô hấp của đất rừng có thể được xác định bằng nhiều phương pháp và thiết bị khác nhau, nhưng phổ biến nhất là phương pháp buồng tĩnh kín. Trong nghiên cứu này, hô hấp đất của hệ sinh thái tự nhiên rừng ngập mặn Cần Giờ (Thành phố Hồ Chí Minh) được đo bằng phương pháp buồng kín di động (DC-Dynamic chamber method) tại 12 sinh cảnh rừng tự nhiên với kích thước ô mẫu 20 m x 20 m. Thông lượng CO2 phát thải từ đất vào khí quyển thu được qua buồng kín được lưu chuyển đến thiết bị phân tích khí hồng ngoại IRGA xách tay và quay trở lại buồng phục vụ việc đánh giá các thông số đo đạc. Kết quả cho thấy rừng ngập mặn Cần Giờ phát thải C qua hô hấp đất với thông lượng trung bình 4,39 µmolCO2.m-².s-¹. Lượng CO2 phát thải qua đất thay đổi theo không gian, thời gian và có mối tương quan với nhiệt độ và độ ẩm buồng đo. Nhiệt độ và độ ẩm buồng đo cùng chế độ thủy triều có tác động đến sự phát thải CO2 qua hô hấp đất tại mỗi vị trí ô mẫu.

Comparison of CO2 Net Exchange between Different Plant Communities in Typical Steppe of Inner Mongolia Plateau

2012 ◽  
Vol 518-523 ◽  
pp. 1492-1495
Author(s):  
Jing Hui Hou ◽  
Yong Li Wang ◽  
Li Xin Wang ◽  
Hua Min Liu ◽  
Cheng Zhen Jia
Keyword(s):  
Plant Community ◽  
Plant Communities ◽  
Net Ecosystem Exchange ◽  
Eddy Covariance Method ◽  
Chamber Method ◽  
Typical Steppe ◽  
Dynamic Chamber ◽  
Free Grazing ◽  
Co2 Sink ◽  
Inner Mongolia Plateau

To measure the carbon exchange of two different plant communities in typical steppe, we used dynamic chamber method improved from static chamber method, and compared it with the regional eddy-covariance method. Results showed that: 1) Biomass of plant community with enclosed restoration was higher than that with free grazing; 2) After 6 years enclosed restoration, the plant community had become a CO2 sink though the region was still a CO2 source while the free grazing plant community had turned into a CO2 source in contrast with its regional CO2 sink, and 3) Net ecosystem exchange (NEE) of enclosed restoration plant community was significantly higher than that of typical steppe.

Continuous Measurement of Diffusive and Ebullitive Fluxes of Methane in Aquatic Ecosystems by an Open Dynamic Chamber Method

2019 ◽  
Vol 53 (9) ◽  
pp. 5159-5167 ◽  
Author(s):  
Oscar Gerardo-Nieto ◽  
Abner Vega-Peñaranda ◽  
Rodrigo Gonzalez-Valencia ◽  
Yameli Alfano-Ojeda ◽  
Frederic Thalasso
Keyword(s):  
Aquatic Ecosystems ◽  
Continuous Measurement ◽  
Chamber Method ◽  
Dynamic Chamber

Photoacoustic/dynamic chamber method for measuring greenhouse gas fluxes in hydroreservoirs

2005 ◽  
Vol 29 (2) ◽  
pp. 603-606 ◽  
Author(s):  
I.B.T. Lima ◽  
E.A. Mazzi ◽  
J.C. Carvalho ◽  
J.P.H.B. Ometto ◽  
F.M. Ramos ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Chamber Method ◽  
Dynamic Chamber ◽  
Gas Fluxes ◽  
Greenhouse Gas Fluxes

Comparing Measurement Approaches for Quantifying CO2 Flux from Downed Woody Debris with a Dynamic Chamber Method

2020 ◽  
Vol 51 (4) ◽  
pp. 351-362
Author(s):  
E. V. Shorohova ◽  
A. V. Mamai ◽  
E. V. Moshkina ◽  
I. V. Romashkin ◽  
V. O. Lopes de Gerenyu ◽  
...  
Keyword(s):  
Woody Debris ◽  
Co2 Flux ◽  
Chamber Method ◽  
Dynamic Chamber ◽  
Downed Woody Debris

scholarly journals The Multiscale Monitoring of Peatland Ecosystem Carbon Cycling in the Middle Taiga Zone of Western Siberia: The Mukhrino Bog Case Study

Land ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 824
Author(s):  
Egor Dyukarev ◽  
Evgeny Zarov ◽  
Pavel Alekseychik ◽  
Jelmer Nijp ◽  
Nina Filippova ◽  
...  
Keyword(s):  
Carbon Cycling ◽  
Western Siberia ◽  
Carbon Accumulation ◽  
Middle Taiga ◽  
Taiga Zone ◽  
Field Station ◽  
Moss Species ◽  
Chamber Method ◽  
The Impact

The peatlands of the West Siberian Lowlands, comprising the largest pristine peatland area of the world, have not previously been covered by continuous measurement and monitoring programs. The response of peatlands to climate change occurs over several decades. This paper summarizes the results of peatland carbon balance studies collected over ten years at the Mukhrino field station (Mukhrino FS, MFS) operating in the Middle Taiga Zone of Western Siberia. A multiscale approach was applied for the investigations of peatland carbon cycling. Carbon dioxide fluxes at the local scale studied using the chamber method showed net accumulation with rates from 110, to 57.8 gC m−2 at the Sphagnum hollow site. Net CO2 fluxes at the pine-dwarf shrubs-Sphagnum ridge varied from negative (−32.1 gC m−2 in 2019) to positive (13.4 gC m−2 in 2017). The cumulative May-August net ecosystem exchange (NEE) from eddy-covariance (EC) measurements at the ecosystem scale was −202 gC m−2 in 2015, due to the impact of photosynthesis of pine trees which was not registered by the chamber method. The net annual accumulation of carbon in the live part of mosses was estimated at 24–190 gC m−2 depending on the Sphagnum moss species. Long-term carbon accumulation rates obtained by radiocarbon analysis ranged from 28.5 to 57.2 gC m−2 yr−1, with local extremes of up to 176.2 gC m−2 yr−1. The obtained estimates of various carbon fluxes using EC and chamber methods, the accounting for Sphagnum growth and decomposition, and long-term peat accumulation provided information about the functioning of the peatland ecosystems at different spatial and temporal scales. Multiscale carbon flux monitoring reveals useful new information for forecasting the response of northern peatland carbon cycles to climatic changes.

scholarly journals Carbon dioxide efflux in a rhodic hapludox as affected by tillage systems in southern Brazil

2009 ◽  
Vol 33 (2) ◽  
pp. 325-334 ◽  
Author(s):  
Luis Fernando Chavez ◽  
Telmo Jorge Carneiro Amado ◽  
Cimélio Bayer ◽  
Newton Junior La Scala ◽  
Luisa Fernanda Escobar ◽  
...  
Keyword(s):  
Soil Temperature ◽  
Crop Residues ◽  
Pore Space ◽  
Abiotic Factors ◽  
Soil Tillage ◽  
Static System ◽  
Southern Brazil ◽  
Soil Co2 ◽  
Tillage Systems ◽  
Dynamic Chamber

Agricultural soils can act as a source or sink of atmospheric C, according to the soil management. This long-term experiment (22 years) was evaluated during 30 days in autumn, to quantify the effect of tillage systems (conventional tillage-CT and no-till-NT) on the soil CO2-C flux in a Rhodic Hapludox in Rio Grande do Sul State, Southern Brazil. A closed-dynamic system (Flux Chamber 6400-09, Licor) and a static system (alkali absorption) were used to measure soil CO2-C flux immediately after soybean harvest. Soil temperature and soil moisture were measured simultaneously with CO2-C flux, by Licor-6400 soil temperature probe and manual TDR, respectively. During the entire month, a CO2-C emission of less than 30 % of the C input through soybean crop residues was estimated. In the mean of a 30 day period, the CO2-C flux in NT soil was similar to CT, independent of the chamber type used for measurements. Differences in tillage systems with dynamic chamber were verified only in short term (daily evaluation), where NT had higher CO2-C flux than CT at the beginning of the evaluation period and lower flux at the end. The dynamic chamber was more efficient than the static chamber in capturing variations in CO2-C flux as a function of abiotic factors. In this chamber, the soil temperature and the water-filled pore space (WFPS), in the NT soil, explained 83 and 62 % of CO2-C flux, respectively. The Q10 factor, which evaluates CO2-C flux dependence on soil temperature, was estimated as 3.93, suggesting a high sensitivity of the biological activity to changes in soil temperature during fall season. The CO2-C flux measured in a closed dynamic chamber was correlated with the static alkali adsorption chamber only in the NT system, although the values were underestimated in comparison to the other, particularly in the case of high flux values. At low soil temperature and WFPS conditions, soil tillage caused a limited increase in soil CO2-C flux.

scholarly journals REMOVAL EFFECTS OF NITROGEN-OXIDES OF PLANT BY CHAMBER METHOD

2004 ◽  
Vol 69 (582) ◽  
pp. 61-66
Author(s):  
Shuji FUJII ◽  
Hiun CHA ◽  
Hisashi MIYAMURA ◽  
Naoki KAGI
Keyword(s):  
Nitrogen Oxides ◽  
Chamber Method

scholarly journals EMISSIONS OF NH3, CH4 AND N2O DURING STORAGE AND AFTER APPLICATION OF UNTREATED AND ANAEROBICALLY DIGESTED SLURRY

1970 ◽  
Vol 63 ◽  
Author(s):  
G. Moitzi ◽  
B. Amon ◽  
T. Amon ◽  
V. Kryvoruchko ◽  
C. Wagner-Alt ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Anaerobic Digestion ◽  
Pig Slurry ◽  
Gaseous Emissions ◽  
Ch4 Emissions ◽  
Dynamic Chamber ◽  
Fermentation Tank ◽  
Application Techniques ◽  
Ch4 And N2o ◽  
Anaerobically Digested Slurry

The paper presents the investigations results of the effect of anaerobic digestion on emissions of NH3, N2O and CH4 during storage and after application of slurry. Dairy cattle and pig slurry was stored in concrete tanks (12 m3) over a period of 100 days. Gaseous emissions were collected continuously by a large open dynamic chamber. Gas concentrations (NH3, N2O and CH4) were analysed by high resolution FTIR-spectrometry. After storage, the slurries were surface applied on permanent grassland. NH3 emissions were followed for two days by a large open-dynamic-chamber. N2O and CH4 emissions were quantified with closed chambers until day 20 after application. 65 – 95 % of net total NH3 emissions were lost after slurry application. NH3 abatement will therefore be effective, if low emission application techniques are used. This is especially important when anaerobically digested slurry is applied. More than 90 % of net total CH4 emissions from untreated slurry were lost during slurry storage. Anaerobically digested slurry still emitted methane during storage. These emissions can be totally avoided if the secondary fermentation tank and the slurry store are connected with the gas bearing system of the biogas plant. Then, CH4 produced in these tanks is collected and used as renewable energy source. In conclusion it can be assumed that biogas plants will play a major role in the reduction of greenhouse gas emissions as they generate renewable energy and reduce CH4 emissions during manure storage. Furthermore, anaerobic digestion improves the fertiliser value of animal manures.

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