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질소와 인산 시비가 루브라 오리나무 ( Alnus rubra Bong . ) 묘목의 외생균근발달과 질소고정 및 생장에 미치는 영향
구창덕(Chang Duck Koo),(Randolph J . Molina),(Steven L . Miller),(Ching Y . Li) 한국산림과학회 1996 한국산림과학회지 Vol.85 No.1
Red alder(Alnus rubra Bong.) seedlings inoculated with Frankia only or both Frankia and spores of Alpova diplophloeus(Zeller & Dodge) Trappe & Smith were grown in a greenhouse for ten weeks. The ten-week-old seedlings were fertilized with six nitrogen(N) and phosphorus(P) fertility regimes (no fertilization, 10mM NH₄NO₃, 50mM NH₄NO₃, 5mM KH₂PO₄, 10mM NH₄NO₃+5mM KH₂PO₄, and 50mM NH₄NO₃+5mM KH₂PO₄) three times a week for ten weeks. The higher N-fertilization significantly increased mycorrhiza formation by greenhouse contaminant mycorrhizal fungi, but decreased N-fixation and P concentration in nodule tissues. P-fertilization significantly increased nodule and shoot dry weight, and P concentration in plant tissues. When N was highly fertilized, however, the P-fertilization effect disappeared in nodule P concentration but doubled in leaf P concentration. A. diplophloeus inoculation significantly increased diameter growth and CO₂ exchange rate, but decreased leaf dry weight. Our results suggest that the higher N- or P-fertilization affect nitrogenase activity and mycorrhizal development but the effects are changed by their interactions.