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INTRODUCTION A lot 0fwork has been done on the variation of natural ~(15)N abundance in soils andtheir N components (Chen et al., 1964). However, these reports
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INTRODUCTION A lot 0fwork has been done on the variation of natural ~(15)N abundance in soils andtheir N components (Chen et al., 1964). However, these reports mostly concerned thegeochemical mean of natural ~(15)N abundance, and only a little work has been done on thecharacteristics of variation of the natural ~(15)N abundance in different ecosystems and itsrelationship with the properties and conditions of soil, which is the aim of our recent re-
INTRODUCTION A lot 0fwork has been done on the variation of natural ~ (15) N abundance in soils andtheir N components (Chen et al., 1964). However, these reports mostly concerned the geochemical mean of natural ~ (15) N abundance, and only a little work has been done on the characteristics of variation of the natural ~ (15) N abundance in different ecosystems and its relationship with the properties and conditions of soil, which is the aim of our recent re-
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