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Effect of Fertilization to the Growth and Physiological Characteristic of Poplar

Author: SunLiTao
Tutor: FangShengZuo
School: Nanjing Forestry University
Course: Silviculture
Keywords: Poplar clones Fertilization treatments Grow Vector Analysis Chlorophyll fluorescence parameters
CLC: S792.11
Type: Master's thesis
Year: 2008
Downloads: 200
Quote: 3
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Abstract


Pot experiment Nanlin 95 Yang (Populus × Euramericana cv.) Study material to from Siyang farm retrieve the soil for the cultivation medium, different fertilization levels specialty fertilizer urea, poplar seedlings growth of poplar year, chlorophyll fluorescence parameters, nutritional characteristics. The same time, supporting Siyang farm research object to I-69 poplar artificial arranged field field fertilization experiments, research urea, ammonium phosphate fertilizer, different fertilization levels on growth of poplar plantation poplar special fertilizer. The main conclusions are as follows: poplar cuttings cuttings quality poplar seedlings have a certain impact on performance for the base of the cuttings seedlings seedlings that are superior to the upper and central parts of the cuttings in the ground diameter, height, number of leaves, and the upper and no significant difference between the central cuttings seedlings. 2. Seedling stage fertilization poplar seedling quality. Urea (N fertilizer) on the role of height growth, but when the amount of reach 9g / basin showed inhibitory effect on growth. Specialty fertilizer 4g ~ 12g / pots dosage, height and diameter growth promoting effect is very significant. Urea height growth earlier than the diameter growth. Special fertilizer treatment on diameter growth earlier than height growth. 3. Fertilization treatment makes poplar height growth to enter the fast-growing period of the time lag, but the extension of the duration of the fast-growing period. To enter the fast-growing period of the earliest CK, latest of urea treatment difference of 16 days, the longest sustained period of fast-growing urea treatment than the minimum CK more than 13 days. 4 the urea amount of 3g / pots significantly improve the the poplar seedlings peeled stem biomass, leaf biomass and total biomass, but with the amount of the increase, the role weakened. Root biomass, the skin biomass growth 3g / pots inhibition. The specialty fertilizer treatment at 4g / pots ~ 18g / pots administration range, with the increase in the amount of poplar root biomass, leaf biomass and total biomass role increased. Skin biomass and peeled stem biomass promoting effect when used in an amount of 12g / pots reaches the maximum, and then decreased. Addition to urea 3 level processing, fertilizer treatments increased poplar seedling leaf area, average leaf area and average leaf dry weight. Special fertilizer level processing of leaf area, 4195.86cm ~ 2, an increase of 122.31% compared with CK. Average leaf area of ??special fertilizer level processing 166.46cm ~ than CK, an increase of 52.13%. The special fertilizer level processing average leaf dry weight, 1.16g, an increase of 58.90% compared with CK. Urea treatment makes poplar leaves than the increase in leaf area, special fertilizer processing makes less than leaf area. Special fertilizer processing, poplar leaf chlorophyll content and poplar biomass was a strong positive correlation. Fertilization treatment can significantly improve the poplar leaves ΦPSII value and ETR values. Vector analysis the nutrition diagnosis results show that, not fertilized poplar leaves N, P, K, are the lack of state is the limiting factor for growth. The the urea 2 level of N has become a luxury consumption, and three levels of urea produced toxic effects. 3 levels of special fertilizer N, P, K Su also become a luxury consumption. But did not produce toxic effects. The field trials showed that different fertilizers and the level of processing of poplar DBH increment was no significant difference in seven months time. 2 levels of urea level and specialty fertilizer processing high growth of poplar role compared with CK, respectively, an increase of 76.47%, 88.24%, reached a very significant level. Poplar leaves after fertilization of N, P prime and K hormone concentrations in the April to September, the gradual decline in the September to November and gradually increased fertilization measures played a declining role to some extent alleviate the concentration.

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CLC: > Agricultural Sciences > Forestry > Forest tree species > Broad-leaved trees > Young
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