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杨树根际土壤磷的分布特征及其有效性(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2003年05期
Page:
20-24
Column:
研究论文
publishdate:
1900-01-01

Article Info:/Info

Title:
Poplar Root-induced Distribution Characteristics of Soil Phosphorus and Its Availability
Article ID:
1000-2006(2003)05-0020-05
Author(s):
WEI YongZHANG HuanchaoZHANG Jinlong
College of Forest Resources and Environment Nanjing Forestry University,Nanjing 210037,China
Keywords:
PoplarRhizospherePhosphorus fractionAvailability
Classification number :
S714
DOI:
10.3969/j.jssn.1000-2006.2003.05.005
Document Code:
A
Abstract:
The characteristics of inorganic phosphorus in the rhizosphere and nonrhizosphere soils under 3,5,11 year I69 clone stands were studied by means of investigating experimental sites and ecological sequential comparison in Dongtai forestry farm,Dongtai county,Jiangsu province.The results showed that in the soil developed on new coastal sediment,most forms of inorganic phosphorus were CaP of which insoluble Ca10P was the main form,approximately accounting for 90%.AvailableP(DAP) was accumulated clearly in the rhizosphere of 3,5,11 year I69 clone stands respectively,and the accumulating rates(RS)/S were increased with the stand ages of I69 clone.Poplar roots have the obvious induced influences on the distribution characteristics of soil inorganic phosphorus fractions.Ca2P was accumulated in the rhizospheres of 3 experimental stands,Ca8P was also accumulated evidently in the rhizospheres of 5,11 year I69 stands,whereas Ca10P was depleted clearly,but not in the rhizosphere of 3 year stand.There were no obvious differences in amounts of AlP,FeP,OP between rhizosphere and nonrhizosphere soils under 3 stands.Tree roots could induce transformation of various CaP fractions,indicating the accumulation of Ca2P and Ca8P corresponding with the depletion of Ca10P in the rhizosphere.Regression analysis indicated that Ca2P had the most contribution to DAP and its accumulation was the essential reason that the amount of DAP was much higher in the rhizosphere.Ca10P was also related to DAP and was the potential P source for plant growth.

References

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Last Update: 1900-01-01