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土壤圈(英文版). 1998, (01)

Evaluation of N2-Fixing Capacities of Herbaceous and Shrub Legumes Under Field ConditionEnglish Full Text

XING GUANGXI; SHI SHULIAN; CAO YACHENG; DU LIJUAN; SUN GUOQING and ZHOU KEYU(Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China))

Abstract: Natural 15N abundance method was used in this study to investigate the N2-fixing capacities of several herbaceous and shrub legumes by a field experiment. For herbaceous legumes, the results were in consistent with those obtained by a pot experiment. Crotalaria mucronata Desv. had a higher N2-fixing capacity than Vigna sinensis （L.） Savi. For shrub legumes, N2-fixing capacity under field condition was slightly different from that in pot experiment. These results demonstrated that the natural 15N abundance method was applicable to evaluating N2-fixing capacities of herbaceous and shrub legumes, and that pot experiment was suitable for evaluating the N2-fixing capacities of not only herbaceous legumes but also shrub legumes.Leguminous N2-fixing plants differed in response to phosphorus fertilization. Phosphorus fertilizer application greatly increased the percentage of nitrogen derived from air （% N dfa） and total amount of N2 fixed by Lespedeza formosa （Vog.） Koehne （Jiangxi）. Phosphorus fertilizer showed no significant effect on the N2-fixing percentage of Cajanus cajan （L.） Millsp. but increased its total biomass, thus increasing the total amount of N2 fixed.
Keywords：

herbaceous legumes; natural 15N abundance method; N2-fixing capacity; shrub legumes;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S154

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