Automated soil monolith-flux chamber system for the study of trace gas fluxes

被引:27
作者
Thomson, PE
Parker, JP
Arah, JRM
Clayton, H
Smith, KA
机构
[1] UNIV EDINBURGH, INST ECOL & RESOURCE MANAGEMENT, SCH AGR, EDINBURGH EH9 3JG, MIDLOTHIAN, SCOTLAND
[2] SCOTTISH AGR COLL, SCH AGR, DEPT SOILS, EDINBURGH EH9 3JG, MIDLOTHIAN, SCOTLAND
[3] INST TERR ECOL, PENICUIK EH26 0QB, MIDLOTHIAN, SCOTLAND
关键词
D O I
10.2136/sssaj1997.03615995006100050006x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Soils are the major source of atmospheric N2O, and better estimates of fluxes are needed to improve the input to climatic general circulation models, We developed a system in a semicontrolled environment to investigate relationships between fluxes of N2O and controlling variables. It consists of 12 soil monoliths (1-m diam., approximate to 0.6 m deep) in glass fiber casings, the tops of which have been converted into gas flux chambers. These chambers are connected to a gas chromatograph for measurement of N2O and CO2. Gas sampling and analysis is computer controlled and can be done continuously, Temperatures and soil water potential are also recorded continuously. The system has performed reliably since continuous operation began in September 1993. We conducted three experiments, examining the effects of soil water potential, organic matter input, and diurnal temperature variation on N2O fluxes, to illustrate the capabilities of the system, In these experiments, the major emissions of N2O (>800 mu g N2O-N m(-2) h(-1)) occurred when the water potential was above -5 kPa, When plant material was incorporated into the soil, a highly significant correlation was found between N2O and CO2 emissions; the N2O emissions showed pronounced diurnal cycles, with the maxima occurring at night, 4 h after the temperature maxima at 0.1-m depth, Data interpretation was greatly aided by the frequency and continuity of measurement.
引用
收藏
页码:1323 / 1330
页数:8
相关论文
共 32 条
[1]   MEASUREMENT OF N2O EMISSION FROM A FERTILIZED GRASSLAND - AN ANALYSIS OF SPATIAL VARIABILITY [J].
AMBUS, P ;
CHRISTENSEN, S .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1994, 99 (D8) :16549-16555
[2]   SPATIAL AND SEASONAL NITROUS-OXIDE AND METHANE FLUXES IN DANISH FOREST-ECOSYSTEMS, GRASSLAND-ECOSYSTEMS, AND AGROECOSYSTEMS [J].
AMBUS, P ;
CHRISTENSEN, S .
JOURNAL OF ENVIRONMENTAL QUALITY, 1995, 24 (05) :993-1001
[3]   SIMILAR N2O FLUX FROM SOIL MEASURED WITH DIFFERENT CHAMBER TECHNIQUES [J].
AMBUS, P ;
CLAYTON, H ;
ARAH, JRM ;
SMITH, KA ;
CHRISTENSEN, S .
ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS, 1993, 27 (01) :121-123
[4]  
[Anonymous], 1995, Climate Change 1994
[5]   NITROUS-OXIDE PRODUCTION AND DENITRIFICATION IN SCOTTISH ARABLE SOILS [J].
ARAH, JRM ;
SMITH, KA ;
CRICHTON, IJ ;
LI, HS .
JOURNAL OF SOIL SCIENCE, 1991, 42 (03) :351-367
[6]   COLLECTION AND EVALUATION OF LARGE SOIL MONOLITHS FOR SOIL AND CROP STUDIES [J].
BELFORD, RK .
JOURNAL OF SOIL SCIENCE, 1979, 30 (02) :363-+
[7]   RELATIONSHIPS BETWEEN FIELD-MEASURED DENITRIFICATION LOSSES, CO2 FORMATION AND DIFFUSIONAL CONSTRAINTS [J].
BENCKISER, G .
SOIL BIOLOGY & BIOCHEMISTRY, 1994, 26 (07) :891-899
[8]   DIURNAL VARIABILITY IN RATE OF EMISSION OF NITROUS-OXIDE FROM SOILS [J].
BLACKMER, AM ;
ROBBINS, SG ;
BREMNER, JM .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1982, 46 (05) :937-942
[9]   EFFECTS OF WATERLOGGING ON SOIL AERATION AND ON ROOT AND SHOOT GROWTH AND YIELD OF WINTER OATS (AVENA-SATIVA L) [J].
CANNELL, RQ ;
BELFORD, RK ;
BLACKWELL, PS ;
GOVI, G ;
THOMSON, RJ .
PLANT AND SOIL, 1985, 85 (03) :361-373
[10]   EFFECTS OF WATERLOGGING AND DROUGHT ON WINTER-WHEAT AND WINTER BARLEY GROWN ON A CLAY AND A SANDY LOAM SOIL .1. CROP GROWTH AND YIELD [J].
CANNELL, RQ ;
BELFORD, RK ;
GALES, K ;
THOMSON, RJ ;
WEBSTER, CP .
PLANT AND SOIL, 1984, 80 (01) :53-66