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Post-thinning Effects on Water Use Efficiency and Transpiration in a Korean Pine Plantation : 잣나무 조림지에서 간벌이 물 이용 효율과 증산에 미치는 영향

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dc.contributor.advisor김현석-
dc.contributor.author박주한-
dc.date.accessioned2018-05-28T16:35:44Z-
dc.date.available2019-04-17-
dc.date.issued2018-02-
dc.identifier.other000000151035-
dc.identifier.urihttps://hdl.handle.net/10371/140805-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 농업생명과학대학 산림과학부, 2018. 2. 김현석.-
dc.description.abstractUnderstanding the underlying mechanism of forest management effects on forest ecosystem function is essential in forest management planning. One of main forest management practices, thinning alters microenvironmental conditions in forest stand. This causes changes of forest function like productivity and water use. The forest management effects have been intensively investigated, and understanding on the underlying mechanisms is increasing. However, they show variations among sites and species.
Korean pine (Pinus koraiensis) is one of main plantation species in Korea because it provides various ecosystem services like timber and corn production. Most of Korean pine forests are planted and intensively managed, but understandings on the effects of management practices are limited. Thus, this study aimed (1) to quantify the effects of thinning on tree water use, productivity and water use efficiency, and (2) to develop stand transpiration model relating canopy conductance with stand structural attributes.
For the first objective, thinning was conducted on Mt. Taehwa with two intensities. The tree water use, productivity and resultant water use efficiency were continuously monitored for four years in a 50-year-old Korean pine plantation. The heavy thinning (30% reduction in stand basal area) significantly improved tree water use and productivity, but light thinning (17% reduction in stand basal area) had minor effects. In addition, the tree size-growth relationship was different by thinning intensity.
For the second objective, stand level transpiration estimated by sap flux density measurement from various stand density and sapwood area was used to develop a canopy conductance model. The canopy conductance model included a set of limitation function by environmental conditions. The reference canopy conductance and stomatal sensitivity to vapor pressure deficit showed a significant relationship with stand sapwood area. With inclusion of this relation, the developed model successfully reproduced the changes of stand transpiration with changes of stand sapwood area and climatic conditions.
The findings of this study on the thinning intensity effects and dominant control of stand transpiration by stand sapwood area help to estimate changes of forest ecosystem function by forest management practices in Korean pine plantations, and can be used as guideline for forest management planning.
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dc.description.tableofcontentsChapter 1. Introduction 1
1.1 Research background 1
1.2 Research objectives 4
Chapter 2. Literature Review 5
2.1 Korean pine plantations and management 5
2.2 Transpiration estimation by sap flux density measurements 8
2.3 Stand transpiration estimation by canopy conductance model 12
Chapter 3. Effects of thinning intensities on tree water use, growth, and resultant water use efficiency of a 50-year-old Korean pine plantation over four years 15
3.1 Abstract 15
3.2 Introduction 16
3.3 Materials and methods 19
3.3.1 Study site 19
3.3.2 Experimental design 21
3.3.3 Data collection 23
3.3.4 Gap filling 25
3.3.5 Environmental variables 26
3.3.6 Statistical analysis 29
3.4 Results 29
3.4.1 Effects of thinning intensities on sap flux density and tree water use 29
3.4.2 Effects of thinning intensities on diameter growth 35
3.4.3 Effects of thinning intensities on tree water use efficiency (WUE) 41
3.5 Disscussion 43
3.5.1 Effects of thinning intensities on tree water use 43
3.5.2 Thinning induced growth enhancement 45
3.5.3 Effects of thinning intensities on tree water use efficiency 46
3.6 Summary 48
Chapter 4. Developing Stand Transpiration Model Relating the Canopy Conductance with Stand Sapwood Area in a Korean Pine Plantation 50
4.1 Abstract 50
4.2 Introduction 51
4.3 Materials and methods 54
4.3.1 Study site 54
4.3.2 Stand transpiration measurement 56
4.3.3 Stand transpiration estimation model 57
4.4 Results 60
4.4.1 Environmental constraints on canopy conductance 60
4.4.2 Relationship between parameter values and sapwood area 62
4.4.3 Stand transpiration estimated by combination of limiting functions 64
4.4.4 Model performance evaluation 66
4.5 Disscussion 68
4.5.1 Canopy conductance sensitivity to environmental and structural variables 68
4.5.2 Interannual variation of parameters 69
4.5.3 Limitations 72
4.5.4 Implications to forest management 73
4.6 Summary 73
Chapter 5. Conclusion 75
Bibliography 78
초 록 109
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dc.formatapplication/pdf-
dc.format.extent1900968 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectThinning-
dc.subjectSapwood area-
dc.subjectSize-growth relationship-
dc.subjectProductivity-
dc.subjectTree and stand water use.-
dc.subject.ddc634.9-
dc.titlePost-thinning Effects on Water Use Efficiency and Transpiration in a Korean Pine Plantation-
dc.title.alternative잣나무 조림지에서 간벌이 물 이용 효율과 증산에 미치는 영향-
dc.typeThesis-
dc.description.degreeDoctor-
dc.contributor.affiliation농업생명과학대학 산림과학부-
dc.date.awarded2018-02-
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