Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China:
Gespeichert in:
| Beteilige Person: | |
|---|---|
| Format: | Hochschulschrift/Dissertation Buch |
| Sprache: | Englisch |
| Veröffentlicht: |
Aachen
Shaker
2010
|
| Schriftenreihe: | Berichte aus der Umweltwissenschaft
|
| Schlagwörter: | |
| Links: | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=020791475&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| Beschreibung: | Zsfassung in dt. Sprache |
| Umfang: | XXI, 111 S. Ill., graph. Darst. |
| ISBN: | 9783832294274 |
Internformat
MARC
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| 245 | 1 | 0 | |a Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China |c Martin Wiesmeier |
| 264 | 1 | |a Aachen |b Shaker |c 2010 | |
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Datensatz im Suchindex
| DE-BY-TUM_call_number | 0001 DM 28708 1002 UMW 143d 2011 B 392 |
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| DE-BY-TUM_katkey | 1751332 |
| DE-BY-TUM_location | Mag 10 |
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| _version_ | 1821933283289595904 |
| adam_text | IMAGE 1
TABLE OF CONTENTS
SUMMARY II
ZUSAMMENFASSUNG VI
TABLE OF CONTENTS XI
LIST OF FIGURES XV
LIST OF TABLES XIX
GLOSSARY XX
1. INTRODUCTION, STATE OF THE ART AND OBJECTIVES I
1.1 INTRODUCTION 1
1.2 STATE OF THE ART AND OBJECTIVES 2
2. MATERIALS AND METHODS 9
2.1 STUDYAREA 9
2.1.1 LOCATION AND CLIMATE 9
2.1.3 GEOLOGY 10
2.1.4 SOILS 11
2.1.5 ECOLOGICAL UNITS AND VEGETATION 15
2.2 PAST AND PRESENT LAND USE 18
2.2.1 TRADITIONAL NOMADIC PASTORALISM 18
2.2.2 INTENSIFICATION OF GRAZING MANAGEMENT IN THE 20 TH CENTURY 21
2.3 PLOT DESCRIPTION, SAMPLING DESIGN AND ANALYTICAL APPROACH 23
2.3.1 CONTINUOUSLY GRAZED AND UNGRAZED EXPERIMENTAL PLOTS 23
2.3.2 LARGE SCALE ASSESSMENT OF SOM DISTRIBUTION 25
2.3.3 CONTROLLED GRAZING EXPERIMENT 26
2.4 SOIL CHEMICAL AND PHYSICAL ANALYSES 28
2.4.1 BULK DENSITY, WATER HOLDING CAPACITY, PH VALUES, ORGANIC AND
INORGANIC
CARBON, TOTAL NITROGEN AND SULPHUR AND CARBON ISOTOPE RATIOS 28
2.4.2 PARTICLE SIZE DISTRIBUTION 29
BIBLIOGRAFISCHE INFORMATIONEN HTTP://D-NB.INFO/1008238023
DIGITALISIERT DURCH
IMAGE 2
2.4.3 PHYSICAL FRACTIONATION 30
2.4.4 SOIL RESPIRATION 31
2.4.5 AGGREGATE STABILITY, PRECOMPRESSION STRESS AND SOIL COMPACTION 31
2.5 STATISTICAL AND GEOSTATISTICAL ANALYSES 32
2.5.1 BASIC STATISTICAL ANALYSES 32
2.5.2 DIGITAL SOIL MAPPING METHODS 32
2.5.2.1 CLASSIFICATION AND REGRESSION TREES 33
2.5.2.2 RANDOM FOREST 33
2.5.3 STATISTICAL VALIDATION 35
2.5.4 GEOSTATISTICAL CALCULATIONS 35
3. DEGRADATION AND SMALL-SCALE SPATIAL HOMOGENIZATION
OF INTENSIVELY-GRAZED STEPPE SOILS 38
3.1 RESULTS 38
3.1.1 SOIL PROPERTIES AND THE AMOUNT OF SOM 38
3.1.2 SPATIAL DISTRIBUTION OF TOPSOIL PROPERTIES AT THE FIELD SCALE 40
3.1.3 SPATIAL DISTRIBUTION OF TOPSOIL PROPERTIES AT THE PLANT SCALE 43
3.2 DISCUSSION 45
3.2.1 DEGRADATION OF SOM IN GRAZED STIPA AND LEYMUS DOMINATED STEPPE
TYPES 45
3.2.2 FORMATION OF SMALL-SCALE SPATIAL HETEROGENEITY OF TOPSOILS AT
UNGRAZED STEPPES... 46
3.2.3 SPATIAL HOMOGENIZATION DUE TO GRAZING AND ECOSYSTEM STABILITY 51
3.3 CONCLUSIONS 52
4. DIGITAL MAPPING OF SOM STOCKS USING RANDOM FOREST
MODELING IN A SEMI-ARID STEPPE ECOSYSTEM 54
4.1 RESULTS 54
4.1.1 SOIL PROPERTIES 54
4.1.2 RF MODEL PERFORMANCE AND VALIDATION OF THE PREDICTION MAPS 55
4.1.3 IMPORTANCE OF PREDICTOR VARIABLES 57
4.1.4 SPATIAL PREDICTION OF ELEMENTAL STOCKS UNDER DIFFERENT LAND USE
CLASSES 60
IMAGE 3
4.2 DISCUSSION 62
4.2.1 EVALUATION OF THE DSM APPROACH 62
4.2.2 ENVIRONMENTAL VARIABLES CONTROLLING THE DISTRIBUTION OF SOM 64
4.2.3 LAND USE RELATED ELEMENTAL STOCKS 65
4.3 CONCLUSIONS 67
5. AGGREGATE STABILITY AND PHYSICAL PROTECTION OF SOIL
ORGANIC CARBON IN SEMI-ARID STEPPE SOILS 68
5.1 RESULTS 68
5.1.1 BASIC CHEMICAL AND PHYSICAL SOIL PROPERTIES 68
5.1.2 SOIL FRACTIONS 69
5.1.3 MACROAGGREGATE STABILITY 72
5.1.4 SOM MINERALIZATION 73
5.2 DISCUSSION 75
5.2.1 PHYSICAL PROTECTION OF SOC AND THE IMPACT OF GRAZING 75
5.2.2 AGGREGATE STABILITY AND PHYSICAL SOC PROTECTION 76
5.3 CONCLUSIONS 79
6. ASSESSMENT OF SENSITIVE SOIL AND VEGETATION PARAMETERS
FOR BEGINNING STEPPE DEGRADATION 80
6.1 RESULTS 80
6.1.1 SOIL PARAMETERS 80
6.1.2 VEGETATION PARAMETERS 83
6.2 DISCUSSION 84
6.2.1 APPLICABILITY OF SOIL PARAMETERS AS INDICATORS FOR BEGINNING
STEPPE DEGRADATION. 84
6.2.2 SENSITIVITY OF VEGETATION PARAMETERS 85
6.3 CONCLUSIONS 87
7. MAIN CONCLUSIONS AND OUTLOOK 89
8. REFERENCES 90
ACKNOWLEDGEMENT/DANKSAGUNG 107
IMAGE 4
PUBLIKATIONEN UND PRAESENTATIONEN 109
LEBENSLAUF 111
|
| any_adam_object | 1 |
| author | Wiesmeier, Martin 1979- |
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| dewey-tens | 630 - Agriculture and related technologies 570 - Biology |
| discipline | Biologie Agrar-/Forst-/Ernährungs-/Haushaltswissenschaft / Gartenbau Geographie |
| format | Thesis Book |
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| geographic | China Nord (DE-588)4042496-0 gnd |
| geographic_facet | China Nord |
| id | DE-604.BV036875990 |
| illustrated | Illustrated |
| indexdate | 2024-12-20T14:43:50Z |
| institution | BVB |
| isbn | 9783832294274 |
| language | English |
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| physical | XXI, 111 S. Ill., graph. Darst. |
| publishDate | 2010 |
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| publisher | Shaker |
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| series2 | Berichte aus der Umweltwissenschaft |
| spellingShingle | Wiesmeier, Martin 1979- Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China Steppe (DE-588)4057302-3 gnd Organischer Stoff (DE-588)4203832-7 gnd Beweidung (DE-588)4112745-6 gnd Grünland (DE-588)4158359-0 gnd Degradation (DE-588)4200268-0 gnd |
| subject_GND | (DE-588)4057302-3 (DE-588)4203832-7 (DE-588)4112745-6 (DE-588)4158359-0 (DE-588)4200268-0 (DE-588)4042496-0 (DE-588)4113937-9 |
| title | Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China |
| title_auth | Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China |
| title_exact_search | Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China |
| title_full | Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China Martin Wiesmeier |
| title_fullStr | Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China Martin Wiesmeier |
| title_full_unstemmed | Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China Martin Wiesmeier |
| title_short | Degradation and spatial variability of soil organic matter at different scales in grazed semi-arid grasslands of Northern China |
| title_sort | degradation and spatial variability of soil organic matter at different scales in grazed semi arid grasslands of northern china |
| topic | Steppe (DE-588)4057302-3 gnd Organischer Stoff (DE-588)4203832-7 gnd Beweidung (DE-588)4112745-6 gnd Grünland (DE-588)4158359-0 gnd Degradation (DE-588)4200268-0 gnd |
| topic_facet | Steppe Organischer Stoff Beweidung Grünland Degradation China Nord Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=020791475&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| work_keys_str_mv | AT wiesmeiermartin degradationandspatialvariabilityofsoilorganicmatteratdifferentscalesingrazedsemiaridgrasslandsofnorthernchina |
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| Signatur: |
0001 DM 28708 Lageplan |
|---|---|
| Exemplar 1 | Ausleihbar Am Standort |
Teilbibliothek Weihenstephan
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