Dendroecology Analysis About The Impact Of Natural Fire Disturbance On Dominant Woods In Taiga

Natural fire disturbance is the most significant natural disturbance occurred in the Taiga, which has far-reaching implications on biological individual growth and development in its forest communities. In this paper, through ring dating information to analysis the stand structure of natural fire disturbance, and then uses Dendrochronology ring index as indicators, applies methods including mutation analysis,growth release analysis and comparative analysis to analyze the influence on DBH growth of major component species including Larix sibirica Ldb.,Picea obovata Ldb.,Abies sibirica Ldb.by fire disturbance in Kanas in Xinjiang.The main results are as follows:(1)The dominant species of stand structure disturbed by natural fire are Abies sibirica and Larix sibirica, most of Abies sibirica are growth after the fire.The dominant species of stand structure not disturbed by natural fire are Picea obovata and Larix sibirica.The fire disturbance has a great impact on the survival of the other species except Larix sibirica .Natural fire disturbance has profound impact on stand structure and forest landscape, and this effect is a result of interaction by natural fire disturbance and forest vegetation characteristics.(2) If Larix sibirica are retained after fire, their DBH growth process will occur significant changes in 16 years, which are showed mainly by an obvious DBH growth accelerate period. It makes that known that fire disturbance not only undermines Siberian larch, but also plays an ecological role to promote remained wood growth.(3) Picea obovata DBH growth process has a notable difference between living in fired stands and unfired stands. Siberian spruce DBH growth in fired stands has an obvious accelerate period after fire disturbance in 17 years, whereas there aren't changes in unfired stands. It shows that fire disturbance not only destroys the Siberian spruce, but also promotes the growth.(4) The DBH of Abies sibirica growth in fired stands mainly reflected that there's a clear DBH growth accelerate period after fire disturbance. Moreover, Abies sibirica and Picea obovata as two non-fire-resistant tree species, which DBH growth both experience three sessions of "delay", speeding up and returning to normal growth. The overall growth trends are consistent.