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The Research on the Nutrient Content of the Alnus Cremastogyne Burkill Artifical Forest System in Seasons

Author: LiuXianCi
Tutor: WenShiZhi
School: Central South University of Forestry Science and Technology
Course: Ecology
Keywords: Artifical forest of Alnus Cremastogyne Burkill Ecology system Nutrient content The trend of nutrient Accumulation index Using rate
CLC: S792.14
Type: Master's thesis
Year: 2007
Downloads: 28
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Abstract

Alnus cremastogyne Burkill is a Leguminosae nitrogen fixation tree and hardwood, which belongs Betulaceae. It grows fastly, and likes living in waterish circumstance, and is fit for living in barren soils, and has gently timber rigidity, the rigidity of which is moderate. So it is multi-function tree, which can not only decontaminate pollution, but also be used to manufacture the firewood, paper and feed. By the research on the trends of the artifical Alnus Cremastogyne Burkill, the forest nutrient and the transform rule of it can be discovered, which is very importment to management of it.This paper has studied the trends of the arbor, the biomass of alive understorey, the biomass of litter storey and the soil nutrient content in the artifical forest system of Alnus Cremastogyne Burkill in seasons. The result shows that:The content of five macro-elements of the leaf orders as follow:N>Ca>K>Mg>P, which arrives the maximum when the spring comes and then gradually reduces.The content of five micro-elements of the leaf orders as follow:Fe>Mn>Zn>Cu>Ni> Pb>Cd, the most of which arrives the maximum when the spring comes and then gradually reduces.The content of five macro-elements of the tress orders as follow: N>Ca>K>Mg>P, which arrives the maximum when the tress grows fastly and then gradually reduces, except the content of Ca, which arrives the maximum in summer. The content of five micro-elements of the leaf orders as follow:Fe>Mn>Zn>Cu> Pb>Ni>Cd, the change of which is not very distinct. The content of five macro-elements of the trunk orders as follow:N>K>Mg>P>Ca, which arrives the minimum in initial growth stages and then gradually increases, except the content of Mg, which changes contrarily. The content of five micro-elements of the trunk orders as follow: Fe>Mn>Cu>Zn>Pb>Ni>Cd, the change of the content of Mn is not very distinct, the content of Ni arrives the minimum when the spring comes, the others increase in the spring and summer.The content of five macro-elements of the bark orders as follow: Ca>N>K>Mg>P, which changes complexly. The content of five micro-elements of the trunk orders as follow:Fe>Mn>Zn>Cu>Pb>Ni>Cd, which also changes complexly. The content of five macro-elements of the root orders as follow:N>Ca>K>Mg>P, which has no changes in the spring, summer and winter and arrives the minimum in the autumn. The content of five micro-elements of the root orders as follow: Fe>>Mn>Zn>Cu>Pb>Ni>Cd,and the content of small-root>>average-root>big-root> top-root, which also changes complexly.The content of five macro-elements of the arbor orders as follow:N>Ca>K>Mg>P, which almost has no changes. The content of five micro-elements of the arbor orders as follow:Fe>Mn>Cu>Pb>Zn>Ni>Cd, which also has no changes.The content of macro-elements of the biomass of alive understorey orders as follow:N>Ca>K>Mg>P, which is more than the arbor’s and reduces litter in the winter. The content of micro-elements of the biomass of alive understorey orders as follow:Fe>Mn>Zn>Cu>Pb>Ni>Cd, which is more than the arbor’s and less than the small-root’s and changes complexly in seasons.The content of macro-elements of the biomass of litter storey orders as follow: N>Ca> Mg> K>P, which is more than the alive understorey’s expect the content of Fe and has almost no change in seasons. The content of micro-elements of the biomass of alive understorey orders as follow:Fe>>Mn>Zn>Cu>Pb>Ni>Cd, the content of Fe is more than the alive understorey’s, and which has almost no change in the spring, summer and winter, but increases in the autumn.The content of organic matter of soil layers orders as follow:the A layer’s>B layer’s>C layer’s, which reduces by depth, and the content of the A layer and B layer increases from the spring to the summer and reduces from the summer to the autumn and increase from the autumn to the winter. The content of C layer reduces slowly from the spring to the winter. The PH of soil layers orders as follow:the B layer’s> A layer’s>C layer’s, which increase from the spring to the summer and reduces from the summer to the autumn and increase from the autumn to the winter and arrives the maximum at last. The content of macro-elements of the soil layer orders as follow:the A layer’s>B layer’s>C layer’s, but the content of K element is different, which orders as follow:B layer’s> C layer’s> A layer’s, which changes complexly in seasons. The content of micro-elements of the soil layer orders as follow:Fe>>Mn>Zn>Ni> Pb> Cu>Co>Cd, which changes complexly in seasons. By the study of the content of soil nutrient in every year, the result shows that:if the Alnus Cremastogyne Burkill is planted, the content of N element, K element and Mg element will reduce, but the content of P and Ca will increase, and the content of Cu, Fe, Zn、Pb, Co and Cd will reduce, but the content of Mn, Ni and Cd will increase.The abilities of Alnus Cremastogyne Burkill to agglomerate the macro-elements are different, which orders as follow:Ca>N>P>K>Mg, these show that the ability of Alnus Cremastogyne Burkill to agglomerate Ca is highest. The abilities of Alnus Cremastogyne Burkill to agglomerate the micro-elements are also different, which orders as follow:Cu>Cd>Zn>Pb>Mn>Ni>Fe, these show that the ability of Alnus Cremastogyne Burkill to agglomerate Cu is highest, but the ability of Alnus Cremastogyne Burkill to agglomerate Fe is the most small, whereas the content of which is the most higth.The Alnus Cremastogyne Burkill needs 12.516kg macro-elements when produces one ton dry matter. The content of the need orders as follow:the leaf’s>>the bark’s>the branch’s>the root’s>the trunk’s. The need of macro-elements orders as follow:N>>P>K>Ca>Mg.The Alnus Cremastogyne Burkill needs 385.884g micro-elements when produces one ton dry matter. The content of the need orders as follow: the root’s>the bark’s>the leaf’s>the branch’s>the trunk’s. The need of micro-elements orders as follow:Fe>Mn>Zn>Cu>Pd>Ni>Cd.The pure increment of macro-elements is 24.762kg.hm-2.a-1 per year, which orders as follow:N>Ca>K>Mg>P. The pure increment of nutrient orders as follow: the leaf’s>the bark’s> the branch’s> the trunk’s> the root’s, these show that the leaf is the main apparatus that produce the nutrient. The pure increment of micro-elements is 823.052g.hm-2.a-1 per year, which orders as follow:Fe>Mn>Zn>Cu>Pb>Ni>Cd. The pure increment of micro-elements orders as follow:the root’s>the bark’s> the leaf’s> the branch’s> the trunk’s, these show that the root is the main apparatus to accumulate the micro-elements.

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