Land use effects on organic matter and associated nutrients in soils of East African highlands: Tanzania and Ethiopia
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Bayreuther Inst. für Terrestrische Ökosystemforschung
2001
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| 100 | 1 | |a Solomon, Dawit |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Land use effects on organic matter and associated nutrients in soils of East African highlands |b Tanzania and Ethiopia |c Dawit Solomon |
| 264 | 1 | |a Bayreuth |b Bayreuther Inst. für Terrestrische Ökosystemforschung |c 2001 | |
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| 490 | 1 | |a Bayreuther bodenkundliche Berichte |v 70 | |
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Titel: Land use effects on organic matter and associated nutrients in soils of East African highlands
Autor: Solomon, Dawit
Jahr: 2001
Contents
Table of contents.i
List of tables.ix
List of figures.xiii
List of abbreviations.xv
Acknowledgements.xvii
Summary.xix
AUSFUHRLICHE DEUTSCHE ZUSAMMENFASSUNG
1. Allgemeine Einleitung.xxv
1.1. Problemslellung.xxv
1.2. Nachhaltigkeit und organische Bodensubstanz.xxvii
1.3. Ziele.xxviii
1.4. Methodische Ansatze dieser Studie.xxviv
2. Material und Methoden.xxx
2.1. Untersuchungsgebiet und Probeflachen.xxv
2.1.1. Die semiariden Gebiete Nord-Tansanias.xxv
2.1.2. Die subhumiden Hochlandgebiete Sudalhiopiens.xxvi
2.2. Komgrofienfraktionierung.xxxii
2.3. Chemische Basisparameter.xxxii
2.4. Ligninbiirtige Phenole.xxxiii
2.5. Kohlenhydrate.xxxiii
2.6. Aminozucker.xxxiii
2.7. Sequentielle P-Extraktion.xxxiii
2.8. 3I P-NMRSpektroskopie.xxxiv
2.9. Nattirliche 13C-Isotopenhaufigkeiten.xxxiv
2.\0.'3C-NMR-Spektroskopie.xxxiv
2.11. Schwefelfrahionierung.xxxiv
2.12. Statistik.xxxiiv
3. Ergebnisse nod Diskussion.xxxv
jj Contents
3.1. Landnutzungseffekte auf Humuseigenschaften von Chromic Luvisols
des semiariden Nord-Tansania: Kohlenstoff, Stickstoff, Lignin und
Kohlenhydrate (Zusammenfassung von Section A, S. 10-31).xxxv
3.2. Landnutzungseffekte auf Aminozucker in Chromic Luvisols der
semiariden Gebiete Nord-Tansanias (Zusammenfassung von Section
B, S. 32-51).xxxvi
3.3. Ackerbaulich bedingte Phosphorverluste aus Boden des semiariden
Nord-Tansania: Befunde aus sequentieller Extraction und 1IP-NMR-
Spektroskopie (Zusammenfassung von Section C, S. 52-72).xxxvii
3.4. Humusumsatz in Agrarokosystemen der subhumiden Hochlandgebiete
Sud-Athiopiens anhand naturlicher n C-Hdufigkeiten
(Zusammenfassung von Section D, S. 73-96).xxxviii
3.5. Zusammensetzung der organischen Bodensubstanz in den subhumiden
Hochlandgebieten Sud-Athiopiens: Einflusse von Abholzung und
Ackerbau (Zusammenfassung von Section E, S. 97-130).xxxiv
3.6. Einflusse von Landnutzungsanderungen im subhumiden athiopischen
Hochland auf Phosphorformen und -dynamik: Sequentielle Extraktion
und 3IP-NMR- Spektroskopie (Zusammenfassung von Section F, S.
131-163).xxxiv
3.7. Einflufi von Landnutzungsanderungen im subhumiden athiopischen
Hochland auf Schwefelformen in Korngrdfienfraktionen
(Zusammenfassung von Section G, S. 164-185).xli
4. ZusammenfassendeSchluBfolgerungen.xlii
4.1. Methodische Aspekte.xlii
4.2. Landnutzungseffekte auf den Humuskorper tropischer Okosysteme.xlii
4.3. Aspekte zu Praxis und Forschungfiir eine nachhaltige Landwirtschqft in
denTropen.xlv
5. Zitierte Literatvr.xlvi
General Introdcction
1. Central iatrodoctioB.3
1.1. Background and research problem.3
Contents
1.2. Soil organic matter as an attribute for sustainability assessment.5
1.3. General objectives.7
1.4. Conception of the study.8
2. References.8
A. Land Use Effects on Soil Organic Matter Properties of
Chromic Luvisols in Semi-arid Northern Tanzania: Carbon,
Nitrogen, Lignin and Carbohydrates
Abstract.15
1. Introduction.16
2. Materials and methods.17
2.1. Site description.17
2.2. Sampling.18
2.3. Particle-sizefractionation.18
2.4. Chemical analysis.19
2.5. Statistics.19
3. Results.21
3.1. Carbon and nitrogen.21
3.2. Lignin.24
3.3. Carbohydrates.27
4. Discussion.29
4.1. Carbon and nitrogen.29
4.2. Lignin.30
4.3. Carbohydrates.31
5. Conclusions.33
Acknowledgments.34
6. References.34
jy Contents
B. Land Use Effects on Amino Sugar Signature of Chromic
Luvisols in the Semi-arid Part of Northern Tanzania
Abstract.39
1. Introduction.40
2. Materials and methods.41
2.1. Site description.41
2.2. Sampling.42
2.3. Particle-sizefractionation.42
2.4. Chemical analysis.43
2.5. Statistics.43
3. Results and discussion.45
3.1. Amino sugar pools.45
3.2. Amino sugar concentrations in SOC.47
3.3. Amino sugar patterns.51
4. Conclusions.53
Acknowledgments.54
5. References.55
C. Loss of Phosphorus from Soil us Semi-arid Northern
Tanzania as a Result of Cropping; Evidence from
Sequential Extraction and 3iP-NMR Spectroscopy
Abstract.61
1. Introduction.62
2. Materials and methods.63
2.1. Site description.63
2.2. Sampling.64
2.3. Particle-size fractionation.,.64
2.4. Chemical analysis.64
2.5. Statistics.66
3. Results and dtscosskm.66
3.1. Sequentially extracted P fractions in bulk soil.66
Contents
3.2. Sequentially extracted P fractions in particle-size separates.69
3.3. Effects of land use on sequentially extracted P fractions in bulk Soil.69
3.4. Effects of land use on sequentially extracted P fractions in particle-size
separates.70
3.5. 31 P-NMR spectroscopy in bulk soil.71
3.6. 3IP-NMR spectroscopy in particle-size separates.73
3.7. Effects of land use on different P forms in bulk soil.75
3.8. Effects of land use on different P forms in particle-size separates.76
4. Conclusions.76
Acknowledgments.77
5. References.78
D. Soil Organic Matter Turnover in the Sub-humid Highland
Agroecosystems of Southern Ethiopia: Results from
Natural 13C Abundance
Abstract.85
1. Introduction.86
2. Materials and methods.87
2.1. Site description.87
2.2. Particle-sizefractionation.89
2.3. Chemical analysis.89
2.4. Calculation ofC derived from Ci and C4 vegetation.90
2.5. Statistics.92
3. Results and discussion.93
3.1. SOC and Ndistribution in bulk soils and particle-size separates.93
3.2. 5 nC signature of plant and liner samples.%
3.3. SI3C signature of bulk soils and particle-size separates.98
3.4. Percentages and amounts of SOC derived from maize and forest vegetationlOO
4. Conclusions.105
Acknowledgments.106
vj Contents
E. Soil Organic Matter Composition in the Sub-humid
Ethiopian Highlands as Influenced by Deforestation and
Agricultural Management
Abstract.Ill
1. Introduction.112
2. Materials and methods.113
2.1. Site description.113
2.2. Particle-sizefractionation.115
2.3. Chemical analysis.115
2.4. Phenolic-C constituents.116
2.5. Carbohydrate-C constituents.116
2.6. Amino sugar-C constituents.116
2.7. Nuclear magnetic resonance spectroscopy.117
2.8. Statistics.117
3. Results and discussion.118
3.1. Soil organic carbon and nitrogen contents.118
3.2. Phenolic signature.123
3.3. Carbohydrate signature.125
3.4. Amino sugar signature.128
3.5. "C NMR Spectroscopy.131
4. Conclusions.138
Acknowledgments.139
5. References.139
F. Phosphorus Forms and Dynamics as Influenced by Land Use
Changes in the Sub-humid Ethiopian Highlands: Sequential
Extraction and 31P NMR Spectroscopy
Abstract.147
1. Introduction.148
2. Materials and methods.149
2.1. Site description.149
Contents ^
2.2. Sampling.150
2.3. Particle-sizefraclionation.151
2.4. Chemical analysis.151
2.5. Sequential fraclionation.152
2.6. Nuclear magnetic resonance spectroscopy.152
2.7. Statistics.153
3. Results and discussion.155
3.1. Phosphorus fractions and contents in bulk soils.155
3.2. Phosphorus forms and contents in particle-size separates.159
3.3. Land use effects on the status and forms ofP in bulk soils.159
3.4. Land use effects on the status and forms ofP in size separates.161
3.5. Liquid state3' P NMR spectroscopy.168
3.5.1. Distribution of Pstructures in alkali extracts ofbulksoils.168
3.5.2. Distribution ofP structures in alkali extracts of size separates.170
3.5.3. Land use effects on P structures in alkali extracts ofbulksoils.171
3.5.4. Land use effects on P structures in alkali extracts of size separates 172
4. Conclusions.173
Acknowledgments.174
5. References.175
G. Sulfur Fractions in Particle-size Separates of the Sub-
humid Ethiopian Highlands as Influenced by Land Use
Changes
Abstract.183
1. Introduction.184
2. Materials and methods.185
2.1. Site description.185
2.2. Particle-sizefractionation.186
2.3. Chemical analysis.187
2.4. Statistics.189
3. Results and discussion.189
3.1. Soil S status and forms in bulk soils and particle-size separates.189
vjij Contents
3.1.1. TotalS.189
3.1.2. Inorganic SO4-S.191
3.1.3. Organic S.192
3.2. Land use effects on the status and forms ofS in bulk soils and particle-size
separates.196
3.2.1. Totals.196
3.2.2. Inorganic SOrS.196
3.2.3. Organic S.196
4. Conclusions.200
Acknowledgments.201
5. References.201
General Conclusions
1. General conclusions.207
1.1. Methodological aspects.207
1.2. Management effects on SOMin tropical ecosystems.207
1.3. Management and research considerations for sustainable agriculture in the
tropics.210
List of Tables
Table A-l. Chemical and physical properties of surface soil (0
to 10 cm) under the different land use systems in
the semi-arid northern Tanzania.20
Table A-2. Soil organic carbon (SOC) and N contents and C/N
ratios in bulk soil of the different land use systems.21
Table A-3. Soil organic carbon and nitrogen contents and C/N
ratio in particle-size separates of the different land
use systems.22
Table A-4. Enrichment factors for SOC (Esoc) and for N (En)
in particle-size separates of the different land use
systems.23
Table A-5. Average VSC lignin yields in SOM associated with
bulk soil and particle-size separates of the different
land use systems.24
Table A-6. Enrichment factors for VSC-lignin (Evsc) and acid
to aldehyde ratio of vanillyl (ac/al)v and syringyl
(ac/al)s units in SOM associated with particle-size
separates of the different land use systems.25
Table A-7. Neutral sugar and uronic acid concentrations in
SOM associated with bulk soil and particle-size
separates of the different land use systems.26
Table A-8. Ratios of mannose plus galactose to arabinose plus
xylose [(Man+Gal)/(Ara+Xyl)] and rhamnose plus
fucose to arabinose plus xylose
[(Rha+Fuc)/(Ara+Xyl)] in SOM associated with
particle-size separates of the different land use
systems.27
Table A-9. Enrichment factors for plant- (Epos) and microbial-
derived (Emds) sugars in SOM associated with
particle particle-size separates of the different land
use systems.28
List of tables
Table B-l. Basic physical and chemical properties of the
surface soil (0-10 cm) of the different land use
systems in northern Tanzania.44
Table B-2. Ammo sugar concentrations (g amino sugar kg"'
SOC) in bulk soil and particle-size separates of the
different land use systems in northern Tanzania.48
Table B-3. Enrichment of total amino sugar concentrations
(Etas) in bulk soil and particle-size separates of the
different land use systems in northern Tanzania.50
Table B-4. Amino sugar ratios in bulk soil and particle-size
separates of the different land use systems in
northern Tanzania.52
Table C-l. Phosphorus fractions (mg kg'1 soil) from the
sequential extraction of bulk soils.67
Table C-2. Amounts of sequentially extracted P fractions (mg
kg"1 soil) in particle-size separates.68
Table C-3. Relative proportions (%) of inorganic and organic
P fractions in 0.5 M NaOH-extracts determined by
wet chemical analysis and 3IP NMR spectroscopy
in bulk soil and particle-size separates.72
Table C-4. Amounts of 0.5 M NaOH-extractable P forms as
determined by integration of 31P NMR signals and
diester/monoester ratio in bulk soil.73
Table C-5. Amounts of 0.5 M NaOH-cxtractable P forms as
determined by integration of 31P NMR signals and
diester/monoester ratio in particle-size separates.74
Table D-l. Physical and chemical characteristics of surface
soils (0-10 cm) in the sub-humid highlands of
southern Ethiopia.93
Table D-2. Soil organic carbon (SOC) and N contents and C/N
ratios of surface soils (0-10 cm) at two sites in
southern Ethiopian highlands.94
List of tables
Table D-3. Soil organic carbon (SOC) and N contents and C/N
ratios of particle-size separates at the Wushwush
site.95
Table D-4. Soil organic carbon (SOC) and N contents and C/N
ratio of particle-size separates at the Munesa site.96
Table D-5. 5 13C values (%o) of fresh leaves, roots and litter
samples.97
Table D-6. Amounts of SOC derived from natural forest (Cjnf)
and maize crop residues (Came) and losses of forest-
derived SOC (Loss-Cdnf) in bulk soils of two
cultivated fields in southern Ethiopian highlands.102
Table D-7. Amounts and proportions of SOC derived from
natural forest and maize plant materials and losses
of SOC derived from natural forests in particle-size
separates of arable soils in the sub-humid
highlands of southern Ethiopia.104
Table E-l. Selected physical and chemical characteristics of
surface soils (0-10 cm) in the sub-humid highlands
of southern Ethiopia.118
Table E-2. Amounts of soil organic carbon (SOC) and N and
phenolic, carbohydrate and amino sugar signatures
in surface soils (0-10 cm) of the different land use
systems.119
Table E-3. Distribution of C species in alkali-extracts of bulk
soil and particle-size separates of the different land
use systems at the Wusbwush site.134
Table E-4. Distribution of C species in alkali-extracts of bulk
soil and particle-size separates of the different land
use systems at the Munesa site.135
Table F-l. Physical and chemical characteristics of surface
soils (0-10 cm) of the southern Ethiopian highlands.154
Table F-2. Total P contents (mg kg"1 soil) in bulk soils and
size separates of the sub-humid southern Ethiopian
highlands.155
List of tables
Table F-3. Distribution of P compounds (as the proportion of
total peak area of 31P NMR spectra) and diester to
monoester ratios in alkali extracts of bulk soils.165
Table F-4. Distribution of P species (as the proportion of total
peak area of 3IP NMR spectra) and diester to
monoester ratios in alkali extracts of size separates
of the Wushwush site.166
Table F-5. Distribution of P species (as the proportion of total
peak area of 3IP NMR spectra) and diester to
monoester ratios in alkali extracts of size separates
of the Munesa site.167
Table G-l. Physical and chemical characteristics of surface
soils (0-10 cm) of the sub-humid highlands of
southern Ethiopia.188
Table G-2. Amounts of different S forms, ester SO4-S and C-
bonded S as the proportion of total organic S and
C/S and N/S ratios in bulk soils of different land
use systems.190
Table G-3. Correlation coefficients (r) for paired relationships
between different forms of S and total soil organic
C (SOC) and N in soils of the sub-humid highlands
of southern Ethiopia.191
Table G-4. Amounts of different S forms, ester SO4-S and C-
bonded S as the proportion of total organic S and
C/S and N/S ratios in particle-size separates of
different land use systems at the Wushwush site.193
Table G-5. Amounts of different S forms, ester SO4-S and C-
bonded S as the proportion of total organic S and
C/S and N/S ratios in particle-size separates of
different land use systems at the Munesa site.194
List of Figures
Figure A-l. Location of the study site.17
Figure B-l. Average depletion of amino sugar contents in bulk
soil of the different land use systems relative to the
native tropical woodland in northern Tanzania.45
Figure B-2. Amino sugar concentrations in SOM associated
with particle-size separates of the different land use
systems in northern Tanzania.46
Figure D-l. Locations of the study sites.88
Figure D-2. Average 813C values of bulk soil and particle-size
separates in the sub-humid highlands of southern
Ethiopia.99
Figure D-3. Proportion of forest- (C^f) and maize derived
(Cdmc) SOC in bulk soils and particle-size separates
of two cultivated soils in southern Ethiopian
highlands.101
Figure D-4. Loss of forest derived SOC [Loss^f)] in bulk
soil and particle-size separates of cultivated fields
at the Wushwush and Munesa sites.103
Figure E-l. Soil organic carbon (SOC) and N contents and C/N
ratios in size separates of the different land use
systems at the Wushwush and Munesa sites.121
Figure E-2. Scanning electron microscope micrographs
(acceleration voltage = 15 kV) of SOM associated
with (a) coarse sand (2000-250 ym), (b) fine sand
(250-20 um), (c) silt (20-2 fun) and (b) clay ( 2
um) size separates of the natural forest at the
Munesa site.122
Figure E-3. Concentrations of CuO-oxidation products and
ratios of lignin-derived phenols in size separates of
different land use system at Wushwush and
Munesa.124
List of figures
Figure E-4. Concentrations of non-cellulosic carbohydrates and
ratios of sugar monomers in size separates of
different land use systems at Wushwush and
Munesa.127
Figure E-5. Total amino sugar concentrations and ratios of
glucosamine to galactosamine (GlcNl+GalN) and
glucosamine to muramic acid (GluN+MurA) in
size separates of the different land use systems at
the Wushwush and Munesa sites.130
Figure E-6. Solution I3C NMR spectra of alkali-extractable
organic matter in bulk soil and size separates of the
different land use systems at the Wushwush site.132
Figure E-7. Solution 13C NMR spectra of alkali-extractable
organic matter in bulk soil and size separates of the
different land use systems at the Munesa site.133
Figure F-l. Amounts of the different P fractions and C/Po and
P/Po ratios in bulk soils of the different land use
systems.156
Figure F-2. Percentage of organic and inorganic P fractions in
bulk soils of the different land use systems.157
Figure F-3. Amounts of the different P fractions and C/Po and
P/Po ratios in particle-size separates of the
different land use systems at the Wushwush and
Munesa sites.158
Figure F-4. 31PNMR spectra of alkali extracts in bulk soils and
size separates of the different land use systems at
the Wushwush site.163
Figure F-5. 3IPNMR spectra of alkali extracts in bulk soils and
size separates of the different land use systems at
the Munesa site.164
Figure G-l. Average depletion of the different S fractions in
bulk soils of the different land use systems relative
to the natural forest at the Wushwush and Munesa
sites.197 |
| any_adam_object | 1 |
| author | Solomon, Dawit |
| author_facet | Solomon, Dawit |
| author_role | aut |
| author_sort | Solomon, Dawit |
| author_variant | d s ds |
| building | Verbundindex |
| bvnumber | BV013611700 |
| classification_rvk | RB 10158 RS 52161 |
| classification_tum | LAN 117f GEO 315f GEO 277f |
| ctrlnum | (OCoLC)76193890 (DE-599)BVBBV013611700 |
| discipline | Geowissenschaften Agrarwissenschaft Pflanzenbau Geographie |
| format | Thesis Book |
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| genre | (DE-588)4113937-9 Hochschulschrift gnd-content |
| genre_facet | Hochschulschrift |
| geographic | Ostafrika (DE-588)4075722-5 gnd |
| geographic_facet | Ostafrika |
| id | DE-604.BV013611700 |
| illustrated | Illustrated |
| indexdate | 2024-08-23T00:10:19Z |
| institution | BVB |
| language | English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-009298961 |
| oclc_num | 76193890 |
| open_access_boolean | |
| owner | DE-703 DE-12 DE-22 DE-BY-UBG DE-M49 DE-BY-TUM DE-634 |
| owner_facet | DE-703 DE-12 DE-22 DE-BY-UBG DE-M49 DE-BY-TUM DE-634 |
| physical | XLIX, 211 S. graph. Darst. |
| publishDate | 2001 |
| publishDateSearch | 2001 |
| publishDateSort | 2001 |
| publisher | Bayreuther Inst. für Terrestrische Ökosystemforschung |
| record_format | marc |
| series | Bayreuther bodenkundliche Berichte |
| series2 | Bayreuther bodenkundliche Berichte |
| spelling | Solomon, Dawit Verfasser aut Land use effects on organic matter and associated nutrients in soils of East African highlands Tanzania and Ethiopia Dawit Solomon Bayreuth Bayreuther Inst. für Terrestrische Ökosystemforschung 2001 XLIX, 211 S. graph. Darst. txt rdacontent n rdamedia nc rdacarrier Bayreuther bodenkundliche Berichte 70 Zsfassung in dt. Sprache Zugl.: Bayreuth, Univ., Diss. Nährstoff (DE-588)4171097-6 gnd rswk-swf Boden (DE-588)4007348-8 gnd rswk-swf Hochland (DE-588)4160159-2 gnd rswk-swf Bodenorganismus (DE-588)4146160-5 gnd rswk-swf Landnutzung (DE-588)4259046-2 gnd rswk-swf Ostafrika (DE-588)4075722-5 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Ostafrika (DE-588)4075722-5 g Hochland (DE-588)4160159-2 s Landnutzung (DE-588)4259046-2 s Bodenorganismus (DE-588)4146160-5 s Nährstoff (DE-588)4171097-6 s Boden (DE-588)4007348-8 s DE-604 Bayreuther bodenkundliche Berichte 70 (DE-604)BV049679111 70 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009298961&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Solomon, Dawit Land use effects on organic matter and associated nutrients in soils of East African highlands Tanzania and Ethiopia Bayreuther bodenkundliche Berichte Nährstoff (DE-588)4171097-6 gnd Boden (DE-588)4007348-8 gnd Hochland (DE-588)4160159-2 gnd Bodenorganismus (DE-588)4146160-5 gnd Landnutzung (DE-588)4259046-2 gnd |
| subject_GND | (DE-588)4171097-6 (DE-588)4007348-8 (DE-588)4160159-2 (DE-588)4146160-5 (DE-588)4259046-2 (DE-588)4075722-5 (DE-588)4113937-9 |
| title | Land use effects on organic matter and associated nutrients in soils of East African highlands Tanzania and Ethiopia |
| title_auth | Land use effects on organic matter and associated nutrients in soils of East African highlands Tanzania and Ethiopia |
| title_exact_search | Land use effects on organic matter and associated nutrients in soils of East African highlands Tanzania and Ethiopia |
| title_full | Land use effects on organic matter and associated nutrients in soils of East African highlands Tanzania and Ethiopia Dawit Solomon |
| title_fullStr | Land use effects on organic matter and associated nutrients in soils of East African highlands Tanzania and Ethiopia Dawit Solomon |
| title_full_unstemmed | Land use effects on organic matter and associated nutrients in soils of East African highlands Tanzania and Ethiopia Dawit Solomon |
| title_short | Land use effects on organic matter and associated nutrients in soils of East African highlands |
| title_sort | land use effects on organic matter and associated nutrients in soils of east african highlands tanzania and ethiopia |
| title_sub | Tanzania and Ethiopia |
| topic | Nährstoff (DE-588)4171097-6 gnd Boden (DE-588)4007348-8 gnd Hochland (DE-588)4160159-2 gnd Bodenorganismus (DE-588)4146160-5 gnd Landnutzung (DE-588)4259046-2 gnd |
| topic_facet | Nährstoff Boden Hochland Bodenorganismus Landnutzung Ostafrika Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=009298961&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| volume_link | (DE-604)BV049679111 |
| work_keys_str_mv | AT solomondawit landuseeffectsonorganicmatterandassociatednutrientsinsoilsofeastafricanhighlandstanzaniaandethiopia |