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Filtering by: Contributor advisor sim Cromack, Kermit Jr. Subject Nitrogen -- Fixation

Association of nitrogen-fixing bacteria with ectomycorrhizae in Douglas-fir

Creator:

Niu, Chih-Hao

Abstract:

Many higher plants have mycorrhizae associated with their roots. These structures are often essential for survival and growth (Harley & Smith 1983). Mycorrhizae are known for the abilities to enhance nutrient absorption. While nitrogen-fixing organisms are found as components of the mycorrhizosphere, mycorrhizal fungi are not presently known to fix...

Resource Type:

Masters Thesis
Levels of asymbiotic nitrogen fixation in leaf litter in Northwest forests

Creator:

Heath, Brian E.

Abstract:

Asymbiotic N fixation in leaf litter in the Northwest was assayed by acetylene reduction. Annual N input measured by periodic sampling in a young Willamette Valley Douglas-fir plantation at Adair, Oregon was 1.08 +_.13 kg/ha. Using different calculating methods, six other annual estimates at the Adair site ranged from 0...

Resource Type:

Masters Thesis