几种饲用牧草的δ^(15)N值及其固氮能力初评

δ ^(15)N VALUES OF FORAGE GRASSES AND PRELIMINARY EVALUATION OF THEIR DINITROGEN FIXATION POTENTIAL FOR THEM

不同种、不同品种豆科牧草茎叶的δ^(15)N值相差甚大,表明了它们的固氮能力的明显不同。某些禾本科牧草茎叶的δ^(15)N值很低,接近大气N_2的δ^(15)N值(0‰),表明它们很可能通过联合固氮等途径获取生长所需的N素,值得进一步研究。

There exist different δ^(15)N values in shoots of different species and varieties of leguminous grasses, showing that the potentialities of their dinitrogen fixation were apparently different. The δ^(15)N values in shoots of some grasses tested were too low, and very close to δ^(15)N value of atmospheric N_2 (0‰). It is possible that they get N to meet the needs of their growth through some associative dinitrogen fixation processes. Further study should be done.