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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 저널정보
- 한국토양비료학회 한국토양비료학회 학술발표회 초록집 The 9th International Conference of The East and Southeast Asis Federation of Soil Science Societies
- 발행연도
- 2009.10
- 수록면
- 231 - 245 (15page)
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초록· 키워드
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Field measurement of soil respiration was carried out under different bioclimatic conditions in Eurasia. The data were simultaneously analyzed to identify factors that determine the in situ soil respiration and its temperature and moisture dependence, together with the laboratory incubation data to support the analyses on field data. We obtained the following results:
1) In teh stepwise regression analysis for estimating in situ whole and microbial soil respiration using soil temperature and moisture as explanatory variables, activation energy (E), or temperature dependence factor, was preferentially selected in the temperate plots, whereas the coefficient for moisture dependence (b) was primarily selected in the tropical plots.
2) Both the incubation and field experiments suggested that E was higher in the tropical zone than in the temperate zones;however, there was some uncertainty in the case of microbial soil respiration determined in the field. Therefore, we assume that the direct influence of climatic change(i.e., global warming) on acceleration of soil organic matter (SOM) decomposition and accompanying decrease in its stock would be more conspicuous in the tropics than in the other zones.
3) The moisture coefficient b and decomposition rate constant k are often higher in the cropland than in the forest or grassland. The land-use conversion of natural vegetation to cropland can, therefore, accelerate the SOM decomposition owing to an increasing decomposition rate constant in addition to the decrease in litter incorporation into the soil after reclamation.
4) There is a close relationship between annual microbial respiration (AMR) and annual whole soil respiration(AWR) presented as: AMR = 0.550 (AWR) - 0.015; (R<SUP>2</SUP> = 0.81<SUP>**</SUP>, n=19). That is, approximately 55% of whole soil respiration is derived from soil microbial origin and the remaining 45% is from a plant-root origin.
5) There was a positive correlation between the decomposition rate constant k determined by the incubation experiment and that based on field measurement. The laboratory incubation experiment has, therefore, proved to be helpful to simulate the in situ dynamics of SOM and to analyze their temperature and moisture dependence.
1) In teh stepwise regression analysis for estimating in situ whole and microbial soil respiration using soil temperature and moisture as explanatory variables, activation energy (E), or temperature dependence factor, was preferentially selected in the temperate plots, whereas the coefficient for moisture dependence (b) was primarily selected in the tropical plots.
2) Both the incubation and field experiments suggested that E was higher in the tropical zone than in the temperate zones;however, there was some uncertainty in the case of microbial soil respiration determined in the field. Therefore, we assume that the direct influence of climatic change(i.e., global warming) on acceleration of soil organic matter (SOM) decomposition and accompanying decrease in its stock would be more conspicuous in the tropics than in the other zones.
3) The moisture coefficient b and decomposition rate constant k are often higher in the cropland than in the forest or grassland. The land-use conversion of natural vegetation to cropland can, therefore, accelerate the SOM decomposition owing to an increasing decomposition rate constant in addition to the decrease in litter incorporation into the soil after reclamation.
4) There is a close relationship between annual microbial respiration (AMR) and annual whole soil respiration(AWR) presented as: AMR = 0.550 (AWR) - 0.015; (R<SUP>2</SUP> = 0.81<SUP>**</SUP>, n=19). That is, approximately 55% of whole soil respiration is derived from soil microbial origin and the remaining 45% is from a plant-root origin.
5) There was a positive correlation between the decomposition rate constant k determined by the incubation experiment and that based on field measurement. The laboratory incubation experiment has, therefore, proved to be helpful to simulate the in situ dynamics of SOM and to analyze their temperature and moisture dependence.
목차
Abstract
Introduction
Materials and methods
Results and Discussion
Conclusion
References
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UCI(KEPA) : I410-ECN-0101-2014-521-000652925