The Character istics of Nutr ient D istr ibution in the Tree Crown ofAbies georgei var . sm ith ii Forest in Mount Sejila of Tibet

KONG Qing-yun; XIN Xue-bing; HUANG Jie

The forest in the Southeast Tibet is the key forest region and the ecology reserve in China. In virgin forestlocated on positioning station for research on ecosystem in Mount Sejila of Tibet, nutrients in the tree crown of fir(Abies georgei var. sm ith ii) forest were measured six times by samp le-p lot survey method and laboratorial analysisfrom May 13 to August 19, 2001. The objective was to research on nutrient contents in the leaves and branches according to different positions, directions or ages, and on amount of nutrient stored in tree crown of fir forest inMountSejila, in order to p rovide with the scientific foundation for forestmanagement in this region. Itwas showed that thetotal nutrient contents in annual leaveswere 1. 12 times that in perennial leaves, and that in the leaves exposed tothe sun were more than that in the sunless ones. The height of tree crown had influence on nutrient contents in leaves and there was some difference in nutrient contents among positions in the same branch. The characteristics of nutrient distribution in the branches were the same as in the leaves, therefore itwas showed that the branches and theleaves use nutrient simultaneously in the p rocess of its distribution or accumulation.

1. Experimental Centre of Forestry in North China, CAF,Beijing　102300, China

2. Institute of Plateau Ecology, College of Tibetan Agriculture and Husbandry, Linzhi　860000, Tibet, China

Received Date: 2006-05-23

Abstract: The forest in the Southeast Tibet is the key forest region and the ecology reserve in China. In virgin forestlocated on positioning station for research on ecosystem in Mount Sejila of Tibet, nutrients in the tree crown of fir(Abies georgei var. sm ith ii) forest were measured six times by samp le-p lot survey method and laboratorial analysisfrom May 13 to August 19, 2001. The objective was to research on nutrient contents in the leaves and branches according to different positions, directions or ages, and on amount of nutrient stored in tree crown of fir forest inMountSejila, in order to p rovide with the scientific foundation for forestmanagement in this region. Itwas showed that thetotal nutrient contents in annual leaveswere 1. 12 times that in perennial leaves, and that in the leaves exposed tothe sun were more than that in the sunless ones. The height of tree crown had influence on nutrient contents in leaves and there was some difference in nutrient contents among positions in the same branch. The characteristics of nutrient distribution in the branches were the same as in the leaves, therefore itwas showed that the branches and theleaves use nutrient simultaneously in the p rocess of its distribution or accumulation.

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Reference (9)

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The Character istics of Nutr ient D istr ibution in the Tree Crown ofAbies georgei var . sm ith ii Forest in Mount Sejila of Tibet

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