共 4 条
[2]
Leaf 15 N abundance of subarctic plants provides field evidence that ericoid, ectomycorrhizal and non-and arbuscular mycorrhizal species access different sources of soil nitrogen[J] . Anders Michelsen,Inger K. Schmidt,Sven Jonasson,Chris Quarmby,Darren Sleep.Oecologia . 1996 (1)
[4]
Comparison of soil extractions by 0.01 M CaCl 2 , by EUF and by some conventional extraction procedures[J] . V. J. G. Houba,I. Novozamsky,A. W. M. Huybregts,J. J. Lee.Plant and Soil . 1986 (3)