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Gannan navel orange orchard soil nutrient supply rhizosphere effect

Author: GuoHuiCai
Tutor: ChenFuSheng
School: Nanchang University
Course: Ornamental Plants and Horticulture
Keywords: Soil nutrient Rhizosphere effect Long-term fertilization Gannan navel orange Soil Quality
CLC: S666.4
Type: Master's thesis
Year: 2011
Downloads: 68
Quote: 0
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Abstract


Provide soil nutrients necessary for the growth of crop nutrients and mineral elements, soil nutrient supply on navel orange fruit tree growth and fruit yield and quality has an important impact. Rhizosphere effect of soil nutrients through plant roots is shedding its secretions and rhizosphere microbial flora, soil enzyme activity and its environment interact to produce dramatic effects. This paper selected Gannan region were planting years 9 years 20 years 31 years fertilization similar navel orange orchard as the research object, measured and analyzed the 0-15 cm ,15-30 cm ,30-45 cm-level and non-rhizosphere rhizosphere soil pH, C, N, P content and its transformation is closely related to soil invertase, urease and acid phosphatase activity of three kinds of navel orange leaf nutrient content and dynamics. The main results are as follows: (1) Different Planting Years navel orange orchard planted with root biomass increased gradually prolonging life. 9 years orchard root biomass with soil depth is reduced to deepen, 20 years and 31 years to deepen orchard with soil depth first increases and then decreases; overall view 9 and 20 years showed an orchard menial root gt; alive root gt; deliberately root gt; dead roots, 31 years orchard trends appear slightly different and dead roots increase in the phenomenon. (2) rhizosphere pHH, rhizosphere and non-rhizosphere soil organic C, total N and total P content increased with the extension of planting years gradually increased. Soil pH, organic C, total N and total P contents were higher than non-rhizosphere rhizosphere, rhizosphere effect showed a positive effect. Different Planting Years navel orange orchard soil nutrient obvious vertical spatial distribution; mean opinion rhizosphere and non-rhizosphere soil pH, organic C and total N content increased with the deepening decline in soil depth, soil total P content in different, but rhizosphere effect showed a \(3) Different Planting Years of navel orange orchards rhizosphere and non-rhizosphere soil C / N, N / P, C / P stoichiometry was no significant difference in the mean, respectively 7.9,2.5 and 19.5, we concluded that the growth of navel orange fruit by N limitation may be stronger than P. (4) soil invertase, urease and acid phosphatase three kinds of activity were planted with the prolongation of a downward trend. Three kinds of activity are rhizosphere than non-rhizosphere, rhizosphere effect (R / S gt; 1) showed a positive effect. Invertase and urease were deepened with soil depth decreases, phosphatase slightly rising trend, three kinds of soil enzyme activities in rhizosphere effect spatial variation inconsistent. (5) Different Planting Years navel orange orchard leaves organic C, total N and total P content difference is small, but there are some orange leaf nutrient content of seasonal dynamics. Orange Leaf C / N, N / P and C / P ratio of about 16, 17 and 273, P infer the relative surplus orange orchards, and has the potential risk of causing environmental pollution. In short, Gannan navel orange orchard soil C, N and P content of the performance of the extension with the planting years increased in varying degrees, but closely related to its transformation activity of three kinds downward trend; nutrient supply and rhizosphere activity effects are manifested as prolongation of life with the growing trend is decreasing, and the C, N, P supply was unbalanced situation changes. Indicates that the conversion rate of soil nutrients and flood response capability showed a downward trend for a long time it seems that the current management model can lead to fertilization decreased soil quality and induced environmental pollution, soil nutrient supply can not meet the long-term sustainability orchard.

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