Fertilization of Juvenile Larix kaempferi for NorthernSub??tropicalA lpine Area
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1.
Research Inst itu te of Forestry, CAF
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2.
K ey Laboratory of Tree Breed ing and Cu ltivation, S tate Forestry A dm in is tration, Beijing?? 100091, China
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3.
Yichang Research Inst itu te of Forestry, Y ichang?? 443111, Hube, i China
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Received Date:
2006-08-10
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Abstract
The in fluence of am ounts, ratios of N, P fertilizer and tim es o f fertilizat ion and the ir in teractions onjuven ile Larix kaempf er i g row th w as stud ied, based on the experim en ta l fertilizat ion forest o f 4×3×2 set upduring E igh th Five-year-plan period in Da lao ling Forestry Farm, Hubei Prov ince. The results show ed that different amounts of fertilization insign ifican tly affected the grow th o fLarix kaempf eri. D ifferences in tree grow th a??mong 3 rat ios ofN, P fert ilizerw ere sign ificant w ith in 3 years after fertilizat ion. G row th decreased w ith the pro??port ion o fN fert ilizer increasing and P fert ilizer decreasing. B y year 1998, the DBH, tree he igh t and vo lum e o fB1 ( the ratio ofN, P fertilizer, 1!0) w as 5. 79% 、6. 58% and 19. 38% respect ive ly h igher than tha t o fB3 ( theratio ofN, P fert ilixer, 1!1) . T imes o f fertiliza tion a ffected the grow th insign ificant ly, and the g row th o f 2 t im esfertilizat ion w as low er than tha t o f one??tim e fertilizat ion. A1 B1 C1 fert iliza tion comb ined m ethod, name ly 25 g fertilizat ion amount, all N fertilizer and one??tim e fert ilization, w as recomm ened for short ro tat ion industrialplanta tion ofL. kaempf eri in northern sub??tropica l a lpine area, o f w h ich d iameter, he ight and vo lume a t 1-??year-old w as 16. 7% 、9. 7% and 26. 2% respect ive ly higher than that of other average.
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