渭北旱塬沟壑区不同立地条件刺槐林生长分析

Growth Analysis of Robinia Pseudoacacia Grown under Different Site Conditions on Arid Gully Area of Weibei Plateau

渭北高原沟壑区主要立地类型土壤水分变化及对刺槐生长影响分析结果表明:土壤水分与刺槐生长之间关系密切,说明水分是影响刺槐生长的主要因素,地形和土壤则是划分渭北旱塬立地类型的主要因子。不同立地类型间刺槐高、地径生长量由大到小的序列为:沟底塌积土>塬面黄土>梁顶黄土>沟底石砾土>阳坡下部黄土>阳坡上部黄土>梁坡上部姜石粗骨土>冲风口黄土>梁顶姜石粗骨土>沟坡中下部阳向黄土>红胶土。

Soil water and its effect on growth of Robinia in gully and hilly area of Weibei plateau were analyzed. The results showed that Robinia growth has a close relationship with soil water, indicating soil water to be the major determinant factor of Robinia growth and topographic condition and soil type to be the indicators for classify site conditions. Suitable site conditions for Roblnia are bottom of gully, top of tableland, upper and lower parts of sun-facing gully slope, top of ridges with soil of loess and loess-stone. Increment of growth and stem diameter follows the order （from the highest to lowest） ： bottom of gully, tableland with loess, ridges with loess, bottom of gully with stone-loess, lower part of sun-facing slope, upper part of sun-facing slope, upper part of ridge with coarse soil, windy corridor and lower and middle parts of sun-facing gully slope.