N-15 ISOTOPE-DILUTION METHODOLOGY FOR EVALUATING THE DYNAMICS OF BIOLOGICALLY FIXED N IN LEGUME-NON-LEGUME ASSOCIATIONS

被引：19

作者：

CHALK, PM

SMITH, CJ

机构：

[1] Division of Soils, CSIRO, Canberra, 2601, ACT

来源：

BIOLOGY AND FERTILITY OF SOILS | 1994年 / 17卷 / 01期

关键词：

BIOLOGICALLY FIXED N; INTERCROPPING; ISOTOPE DILUTION; LEGUMES; N TRANSFER N-15; PASTURES;

D O I：

10.1007/BF00418677

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

We examined the theoretical basis for estimating the transfer of N-2 fixed by legumes to companion cereals or grasses in intercropping or pasture systems using N-15 isotope dilution methodology. A method was developed to calculate the symbiotic dependence of the legume in a mixed stand based on N-15 enrichment of the associated non-legume and the estimate of fixed N transfer. Published field data were used to illustrate the application of the method. Complementary treatments for verifying N transfer and options for increasing the accuracy of estimates of N transfer are discussed.

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收藏

页码：80 / 84

页数：5

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