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논문 기본 정보

자료유형
학술대회자료
저자정보
(Smithsonian Tropical Research Institute) (Lincoln University)
저널정보
한국토양비료학회 한국토양비료학회 학술발표회 초록집 20th WORLD CONGRESS OF SOIL SCIENCE
발행연도
수록면
31 - 31 (1page)

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초록· 키워드

In a remarkable article published in 1976, T.W. Walker and J.K. Syers proposed a conceptual model of phosphorus transformations during pedogenesis that has transformed our understanding of nutrient availability and limitation in terrestrial environments. Distilling data from four New Zealand soil chronosequences, they observed that nitrogen is absent from most parent materials, so nitrogen concentrations are low in young soils but increase rapidly during the early stages of ecosystem development through biological nitrogen fixation. In contrast, phosphorus is derived almost exclusively from the parent material, so phosphorus concentrations are greatest in young soils but decline continuously during pedogenesis as phosphorus is lost in runoff at a greater rate than it is replenished by bedrock weathering. At the same time, chemical transformations further reduce the biologically available phosphorus pool by sequestering it in organic and refractory inorganic forms. As a consequence of these changes, the nutrient limiting primary production varies during ec ... 전체 초록 보기
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