Preliminary study on growth regularity of Castanpsis hystrix plantation

Based on the material of stem analysis,the growth regularity of Castanpsis hystrix A.DC plantation in Daqingshan was analyzed.The results show that(1) the fast-growing period of annual increment of DBH was from the 7th year to the 12nd year,the growth of annual increment of DBH reached the peak in the 8th year,it declined slightly after 11th years,but the curve of annual increment of DBH and the curve of average growth didn't intersect until the 22nd ～ 23rd years.(2) the fast growing period of annual increment of tree height was during the 4th ～ 11st years,and the annual increment of tree height reached the peak in the 7th and 8th years,after that it gradually decreased,and it intersected with the curve of average growth of tree height in the 12nd years.(3) the fast growing period of volume was during the 11st ～ 27th years,and until the 27th year,the growth of volume hadn't reached the quantitative maturity,the growth of Castanpsis hystrix A.DC plantation volume had a great potential.(4) the Richards equation was good to mode the growth regularity of DBH,tree height and volume of Castanpsis hystrix plantation,the goodness of fit were more than 0.99,fitting effect was obvious.