APPRAISAL OF THE N-15 NATURAL-ABUNDANCE METHOD FOR QUANTIFYING DINITROGEN FIXATION

被引：65

作者：

BREMER, E ^{[1
]}

VANKESSEL, C ^{[1
]}

机构：

[1] UNIV SASKATCHEWAN, DEPT SOIL SCI, SASKATOON S7N 0W0, SASKATCHEWAN, CANADA

来源：

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL | 1990年 / 54卷 / 02期

关键词：

D O I：

10.2136/sssaj1990.03615995005400020018x

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Several investigators have questioned the use of the 15N natural-abundance method of estimating N2 fixation because of variability on soil δ15N and small differences between the δ15N of soil N and atmospheric N. Investigations were conducted to compare the 15N natural-abundance and 15N-isotope-dilution methods for estimating N2 fixation of field-grown pea (Pisum sativum L.) and lentil (Lens culinaris Medik.). Spatial variability was assessed at three sites by determining the δ15N of non-N2-fixing plants. Estimates of N2 fixation were not significantly different in 18 out of 21 comparisons; in two comparisons the δ15N method and in one comparison the 15N-enriched method provided higher estimates of N2 fixation. Overall, both methods appeared to provide equally reliable estimates of N2 fixation for lentil.

引用

页码：404 / 411

页数：8

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