Forest floor CO 2 fluxes in temperate forest ecosystems: an investigation of spatial and temporal patterns and abiotic controls
Gespeichert in:
| 1. Verfasser: | |
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| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
Bayreuth
BITÖK
2002
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| Schriftenreihe: | Bayreuther Forum Ökologie
96 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | Zsfassung in dt. Sprache |
| Beschreibung: | VI, 119 S. Ill., graph. Darst. |
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| 245 | 1 | 0 | |a Forest floor CO 2 fluxes in temperate forest ecosystems |b an investigation of spatial and temporal patterns and abiotic controls |c Jens-Arne Subke |
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Datensatz im Suchindex
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| adam_text | Titel: Forest floor CO 2 fluxes in temperate forest ecosystems
Autor: Subke, Jens-Arne
Jahr: 2002
Contents
III
Table of Contents
General Introduction...........................................................................................1
1.1 Background............................................................................................................1
1.1.1 Global change and terrestrial ecosystems...............................................................1
1.1.2 Soils and the C balance of forest ecosystems.........................................................3
1.2 Current state of research......................................................................................5
1.2.1 Studies of soil CO2 efflux in terrestrial ecosystems..................................................5
1.2.2 The carbon balance of forest ecosystems...............................................................6
1.3 Aim of this study....................................................................................................7
Chapter 1 Soil CO2 sampling system..................................................................9
1.A Abstract..................................................................................................................9
1.1 Introduction............................................................................................................9
1.1.1 State of the art in soil CO2 efflux measurements.....................................................9
1.1.2 Objectives for the sampling system.......................................................................11
1.2 System components............................................................................................12
1.2.1 Chamber materials and principle of operation.......................................................12
1.2.2 Solenoid based switching unit and gas analysis components...............................12
1.3 Chamber properties and tests............................................................................14
1.3.1 Methods.................................................................................................................14
1.3.2 Results...................................................................................................................16
1.4 Discussion............................................................................................................20
1.4.1 Assessment of chamber artefacts..........................................................................20
1.4.2 Measuring cycles and data quality tests................................................................22
1.5 Conclusion...........................................................................................................23
Chapter 2 Spatial and temporal variation of soil CO2 efflux in a
MATURE SPRUCE FOREST IN SOUTHERN GERMANY................................24
2.A Abstract................................................................................................................24
2.1 Introduction..........................................................................................................24
2.2 Methods................................................................................................................25
2.2.1 Site description......................................................................................................25
2.2.2 Installation of the soil respiration system...............................................................25
2.2.3 Soil respiration measurements..............................................................................26
2.2.4 Correlating measurements.....................................................................................27
2.2.5 Belowground biomass sampling............................................................................27
2.2.6 Data analysis.........................................................................................................28
2.2.7 Calculating the annual soil carbon efflux for Weidenbrunnen 2.............................30
2.3 Results..................................................................................................................31
2.3.1 Daily and seasonal patterns of soil CO2 efflux.......................................................31
2.3.2 Spatial variation.....................................................................................................39
2.3.3 Belowground biomass............................................................................................41
2.3.4 Annual soil CO2 efflux for Weidenbrunnen 2..........................................................42
2.4 Discussion............................................................................................................45
2.4.1 Fundamental temperature dependence of soil CO2 efflux.....................................45
2.4.2 Temperature profile within the soil.........................................................................45
2.4.3 Soil moisture limitations.........................................................................................47
2.4.4 Soil CO2 efflux facilitation by wind forcing..............................................................49
IV
Contents
2.4.5 Contribution of root respiration to the soil CO2 efflux.............................................50
2.4.6 Annual soil CO2 efflux............................................................................................50
2.5 Conclusion...........................................................................................................51
Chapter 3 Eddy Covariance measurements below the canopy.....................52
3.A Abstract................................................................................................................52
3.1 Introduction..........................................................................................................52
3.2 Methods................................................................................................................53
3.2.1 Site description......................................................................................................53
3.2.2 Eddy covariance....................................................................................................54
3.2.3 Data acquisition and processing............................................................................56
3.2.4 CO2 flux from open soil chambers.........................................................................61
3.2.5 Flux contribution of the ground vegetation.............................................................61
3.2.6 Light response of the ground vegetation................................................................62
3.3 Results..................................................................................................................64
3.3.1 Comparison of eddy flux against chamber flux measurements at night................64
3.3.2 Corrected ground vegetation fluxes for day and night...........................................66
3.3.3 Average daily flux sums.........................................................................................67
3.3.4 Light response of the ground vegetation fluxes.....................................................68
3.4 Discussion............................................................................................................69
3.5 Conclusion...........................................................................................................73
Chapter 4 Soil CO2 efflux and total ecosystem respiration at four
FOREST PLOTS IN GERMANY AND FRANCE............................................74
4.A Abstract................................................................................................................74
4.1 Introduction..........................................................................................................74
4.2 Methods................................................................................................................75
4.2.1 Site descriptions....................................................................................................75
4.2.2 Soil CO2 efflux measurements...............................................................................76
4.2.3 Eddy covariance towers.........................................................................................77
4.2.4 Data analysis.........................................................................................................77
4.2.5 Quantification of respiratory fluxes.........................................................................78
4.3 Results..................................................................................................................78
4.3.1 Chamber measurements.......................................................................................78
4.3.2 Eddy covariance flux measurements.....................................................................80
4.3.3 CO2 flux quantification...........................................................................................82
4.4 Discussion............................................................................................................82
4.4.1 General..................................................................................................................82
4.4.2 Component fluxes within each site........................................................................83
4.4.3 Influence of the measuring technique on the soil CO2 efflux estimate...................84
4.5 Conclusion...........................................................................................................86
Concluding Discussion.......................................................................................88
C.1 Measuring the CO2 flux below the canopy of temperate forest ecosystems. 88
C.1.1 Evaluation of the employed measuring systems....................................................88
C.1.2 Implications of the results for sampling strategies.................................................89
C.2 Modelling of the soil COj efflux..........................................................................90
C.3 Carbon balance of the forest floor.....................................................................91
______________________________Contents___________________________V
Summary ...........................................................................................................93
zusammenfassung................................................................................................97
References.........................................................................................................101
Appendix A.......................................................................................................114
Modelling the soil water content and canopy CO2 assimilation at Weidenbrunnen 2.....114
A.1 General model description...................................................................................114
A.2 Meteorological drivers..........................................................................................114
A.3 Calibration data (for modelling SWC)..................................................................115
A.4 Fitting procedure and model results.....................................................................115
A.5 Modelled SWC data set.......................................................................................117
Appendix B.......................................................................................................118
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| spelling | Subke, Jens-Arne Verfasser aut Forest floor CO 2 fluxes in temperate forest ecosystems an investigation of spatial and temporal patterns and abiotic controls Jens-Arne Subke Bayreuth BITÖK 2002 VI, 119 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Bayreuther Forum Ökologie 96 Zsfassung in dt. Sprache Zugl.: Bayreuth, Univ., Diss., 2002 Waldökosystem (DE-588)4282537-4 gnd rswk-swf Klimaänderung (DE-588)4164199-1 gnd rswk-swf Kohlendioxidaustausch (DE-588)4233896-7 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Waldökosystem (DE-588)4282537-4 s Kohlendioxidaustausch (DE-588)4233896-7 s Klimaänderung (DE-588)4164199-1 s DE-604 Bayreuther Forum Ökologie 96 (DE-604)BV008047580 96 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=010058769&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Subke, Jens-Arne Forest floor CO 2 fluxes in temperate forest ecosystems an investigation of spatial and temporal patterns and abiotic controls Bayreuther Forum Ökologie Waldökosystem (DE-588)4282537-4 gnd Klimaänderung (DE-588)4164199-1 gnd Kohlendioxidaustausch (DE-588)4233896-7 gnd |
| subject_GND | (DE-588)4282537-4 (DE-588)4164199-1 (DE-588)4233896-7 (DE-588)4113937-9 |
| title | Forest floor CO 2 fluxes in temperate forest ecosystems an investigation of spatial and temporal patterns and abiotic controls |
| title_auth | Forest floor CO 2 fluxes in temperate forest ecosystems an investigation of spatial and temporal patterns and abiotic controls |
| title_exact_search | Forest floor CO 2 fluxes in temperate forest ecosystems an investigation of spatial and temporal patterns and abiotic controls |
| title_full | Forest floor CO 2 fluxes in temperate forest ecosystems an investigation of spatial and temporal patterns and abiotic controls Jens-Arne Subke |
| title_fullStr | Forest floor CO 2 fluxes in temperate forest ecosystems an investigation of spatial and temporal patterns and abiotic controls Jens-Arne Subke |
| title_full_unstemmed | Forest floor CO 2 fluxes in temperate forest ecosystems an investigation of spatial and temporal patterns and abiotic controls Jens-Arne Subke |
| title_short | Forest floor CO 2 fluxes in temperate forest ecosystems |
| title_sort | forest floor co 2 fluxes in temperate forest ecosystems an investigation of spatial and temporal patterns and abiotic controls |
| title_sub | an investigation of spatial and temporal patterns and abiotic controls |
| topic | Waldökosystem (DE-588)4282537-4 gnd Klimaänderung (DE-588)4164199-1 gnd Kohlendioxidaustausch (DE-588)4233896-7 gnd |
| topic_facet | Waldökosystem Klimaänderung Kohlendioxidaustausch Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=010058769&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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| work_keys_str_mv | AT subkejensarne forestfloorco2fluxesintemperateforestecosystemsaninvestigationofspatialandtemporalpatternsandabioticcontrols |