黄土高原中槐生长调查分析

为了解中槐生长规律和不同条件下的生长情况，我们对中槐片林和散生木采用了标准的地和优势木调查。其生长规律是前5年高生长快，但径生长慢，5年后高生长减缓，而径生长较快，材积15年后生长加快；中槐生长一般随海拔增高而减缓；不同地形部位生长以原面和川道为好，其次为沟底，沟坡中部生长最差；不同土壤生长以塿土和黄墡土为最好，其次为黄绵土，绵沙土最差。

Growth Analysis of Sophora Japonica on Loess Plateau

Methods of sample plots and superior siagle tree were used to analyzed the growth rule of Sophora Japonica and the growth under different conditions on loess plateau,The results showed that in the first five years the height growth was relatively faster than the diameter growth, but after five years the condition was reverse; the growth of Sophora Japonica slowed down as altitude increased;the best growth was found on the bottom of valley and the worst at the middle part of slope;in regards to soil types ,the order was lou soil,huangshan soil,huangmian soil and miansha soil.