Abstract:

Taking Picea Schrenkiana var.Tianschanica in Western Tianshan National Nature Reserve for example and based on the biodiversity survey data form May to August in 2008 and monitoring data form July to August in 2014,stand structure parameters and species diversity index of different sample plot area are calculated.The results show that the stand structure parameters and species diversity index have a big change on a small scale,when sample plot area is greater than or equal to 80m×80m,it is stable on change trend of stand structure parameters and species diversity index.The stand spatial distribution is random,the growth competition is in the middle,Picea Schrenkiana var.Tianschanica takes absolute dominance on the species composition and there are a small amount of other mixed tree species.There is not an obvious difference in Picea Schrenkiana var.Tianschanica individual growth,there are rarely seedlings and saplings of Picea Schrenkiana var.Tianschanica ,there are more dead standing trees and downed logs in the sample plot,It's a recessionary population.It is urgent conduct to forest tending and artificial stimulating natural regeneration.

Key words: Picea Schrenkiana var.tianschnica, stand structure, species diversity, forest inventory and monitoring, Western Tianshan National Nature Reserve