Studies on theMa in Causal Factors Affect Cinnam om um cam phorYellowing in Urban Condition

CHEN Chao-yan; LIU Hong-jian; SHU Qing-long; LIU Xiao-li; ZHANG Xin

The main factors affected Cinnam om um cam phor yellowing in urban area were investigated, and somenutrient elements in soil and leaveswere determined. The results showed that there were many factors as the causesof camphor-tree yellowing and the key factorswere the root covered tightlywith the cement; the soil polluted by thebuilding garbage or waste or the sewage; soil PH value too high; the soil texture too clay and harden which causedby human activity, and im-balance of nutrient elements, etc. . In soilmineral elements, the severity of yellowingwaspositively correlated with the contents of the available potassium, boron, copper, zinc; and negatively correlatedwith that of the organic matter, available ferric, nitrogen, phosphorus, and manganese. In leaves the contents ofavailable nitrogen, zinc, ferric, and manganese increased with the decrease of disease index and that of sulphur,calcium, boron and copper decrease with the increase of disease index.

1. Anhui Agricultural University, Hefei　230036,Anhui, China

2. Forestry Department of Kenli County,Dongying City, Shandong Province,Dongying　257000, Shandong, China

3. Forestry Academe of Anhui Province , Hefei　230031,Anhui, China

4. Junior College of Hefei, Anhui Provience, Hefei　230000,Anhui, China

Received Date: 2006-12-30

Abstract: The main factors affected Cinnam om um cam phor yellowing in urban area were investigated, and somenutrient elements in soil and leaveswere determined. The results showed that there were many factors as the causesof camphor-tree yellowing and the key factorswere the root covered tightlywith the cement; the soil polluted by thebuilding garbage or waste or the sewage; soil PH value too high; the soil texture too clay and harden which causedby human activity, and im-balance of nutrient elements, etc. . In soilmineral elements, the severity of yellowingwaspositively correlated with the contents of the available potassium, boron, copper, zinc; and negatively correlatedwith that of the organic matter, available ferric, nitrogen, phosphorus, and manganese. In leaves the contents ofavailable nitrogen, zinc, ferric, and manganese increased with the decrease of disease index and that of sulphur,calcium, boron and copper decrease with the increase of disease index.

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Reference (11)

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Studies on theMa in Causal Factors Affect Cinnam om um cam phorYellowing in Urban Condition

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References

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