| Pinus massonana is the important trees of our country, in southern area of our country. Pinus massonana plantation is built largely every year.And the demand for Pinus massonana seedling rises rapidly. It is main means to use Container seeding to build Pinus massonana plantation because of that using bared-rooted seeding to afforest has some disadvantages .But traditional container seedlings media is inconvenient to transport and increase afforesting cost. It is hard to develop traditional container seeding.On the basis of fully investigating local discards source in agriculture and forestry, we make use of simplex centroid mixture design .Four kinds of major mediums (peat soil , pearlite , sawdust and com shell ) were selected to consist of fourteen kinds of various mediums and two contrast mediums were taken .too.Analyzing basic physical character and root group holding soil capacity and weight of nutrition bag of different kinds of mediums , investigating growth of different kinds of Pinus massonana container seedling, curve graph of different mediums of Pinus massonana growth were drawn about height, basal diameter, individual average biomass and foot-system biomass .Based on survey data of 100 days of container seedling of Pinus massonana and methods of single factor analysis of variance and much mathematics methods to compare again ,we compared difference between them. Finally we use evaluated comprehensively by multi-objective decision method to have comprehensive appraisal and draw the following conclusion:(1)The physical property of different mediums has great difference. The lightest is No.3 (0.15g/cm3) among them, and its weight is 17% of the contrast ,but water-holding capacity is 6 times contrasted (No. 15). The weight of No. 14 (41.76~74.69g / bag) is lighter than the two contrast( No. 15 ,133.47g / bag and No. 16, 80.51g / bag)in this experiment.(2)Root group holding soil capacity is obviously different among different mediums .The better is No.8 and No. 13 . up to 91%;but some mediums consisting of pearlite and corn shell much more ( such as No.2 and No.4) are generally relatively low .At the same time germination rate has no obvious difference and lies between 75% ~ 85% basically.(3)The difference of mediums has distinct influence on height ,basal diameter, height-diameter ratio .individual average biomass ,root-system biomass ,shoot-root ratio and seedling quality index to one hundred days Pinus massonana container seedling . Seeing from growth index and quality index, No.3, No.6 , No. 13 , No. 1, No. 10 and No. 14 grow better than the two contrast(No,15 and No.l6)and are ideal mediums. The study results indicated that the difference of height ,basal diameter individual average biomass and root-system biomass of different mediums of one hundred days of Pinus massonana container seedling is extremely significant or significant between them .(4) The growth process of height .basal diameter individual average biomass androot-system biomass of different mediums of Pinus massonana container seedling accords with " S " type growth curve basically.(5)The difference of mediums has certain influence on cost , the individual cost of l~14No. ranges from 0.053 to 0.062 yuan .and is slightly higher than No. 15 (0.049 yuan) or No. 16 (0.050 yuan) .and the highest one is No .2 (0.062 yuan) among them .(6)The best substrate formula is No.3 and the next is No.6 by evaluated comprehensively by multi-objective decision method . The comprehensive appraisal result of one hundred days container seedling is No.3 (0.8841)> No.6 (0.8427)> No.1 (0.7863)> No.13 (0.7849> No.14 (0.7586)> No.10 (0.7371)> No.8 (0.6190)> No.16 (0.5929)> No.11 (0.5335)> No.I5 (0.4654)> No.9 (0.4294)> No.7 (0.4456)> No.5 (0.4148)> No.12 (0.3374)> No.4 (0.3209)> No.2 (0.2434).(7)Based on mathematical mode of experimental design , this paper draws a recursive equation on height ,basal diameter ,biomass of 100 days Pinus massonana container seedling .The equation was tested successfully The optimized mediums for container seedling w... |
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