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Direct Measurement of co_2 Retention in Arable Soils with pH Above 6.5 During Barometric Process Separation Incubation

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Pedosphere 2018年第5期28卷 726-738页

作者： Hannah coNRADS Joachim INGWERSEN JU Xiaotang Thilo STRECK Institute of Soil Science and Land Evaluation Biogeophysics SectionUniversity of Hohenheim college of Agricultural Resources and Environmental Sciences China Agricultural University

The barometric process separation(BaPS)technique is a well-established incubation method to simultaneously measure gross nitrification and respiration rates in *** application,however,is still critical in soils with pH above ***,a substantial part of microbial co_2 production is retained in soil solution(co_2,aq)due to shifts in the carbonate *** may lead to substantial errors in gas balance ***,utilization of the BaPS technique is only reliable if the critical term is adequately *** present an easy,inexpensive,and direct method,the sterilization-co_2-injection(SCI)method,to measure co_2 retention during soil *** soil was incubated in the BaPS system,and defined volumes of co_2 were injected to stepwise increase co_2partial pressure(p co_2)inside the chamber and to analyse the physicochemical equilibration *** exemplary agricultural soils from Northeast China and Southwest Germany were used for method establishment,presenting pH values between 4.4 and 7.6 and carbonate contents between 0% and 3.9%.We observed that in soils with pH>6.5,70%–90% of the injected co_2 was taken up by the soil until the equilibrium inside the chamber was *** expected,in soils with low pH(co_2 retention was ***_2 retention patterns were sensitive to incubation temperature with tri-fold dissolution capacity at 5~?C compared to 25?C,but insensitive to variations in soil water *** resulting soil-specific relationship between p co_2 and co_2,aq concentration allowed the quantification of co_2,aq concentration as a function of headspace p co_2.

关键词： carbonate equilibrium co2 dissolution capacity co_2 partial pressure microbial co2 production soil pH sterilization-co2-injection method volume of headspace air volume of soil solution

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Clinical Study of P_(ET)co_2 in One-lung Ventilation

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Journal of Huazhong University of Science and Technology(Medical Sciences) 1996年第3期16卷 179-182页

作者：张传汉马自成金士翱

Fourty-eight patients (ASA physical status Ⅰ - Ⅱ) undergoing selected thoracotomy and pulmonectomy were studied. They were divided into two groups according to different respiratory modes, two-lung ventilation (TLV) and onelung ventilation (OLV) or TLV and OLV with a Bain cyclic system for CPAP on the side of operated lung. PETco2 and Paco2 were measured after 30 min TLV,30 min and 60 min OLV, and repeated TLV (R-TLV) 30 min after pulmonectomy, to evaluate the difference between PETco2 and Paco2 in OLV and to observethe effect of abating hypoxemia and discharge of co2 in OLV with Bain *** results showed that the Paco2 and PETco2 in different test groups were normal though the measured values in OLV were slightly higher than that in TLV (Pcovered after R-TLV (P>0. 05). There was nosignificant difference between group 1. and 2. in OLV (P>0. 05). There was aclose correlation between PETco2 and Paco2 (Pco2 and radio of PETco2/Paco2 in different ventilation modes were not significant. Hypoxemia in OLV was corrected by Bain system, but the discharge of co2 was not affected. The results showed that measurement of PET co2 as a non-invasive procedure can be commonly used to monitor OLV.

关键词： co_2 partial pressure one-lung ventilation non-invasive monitoring

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