晋西黄土丘陵沟壑区刺槐林适宜性评价

Evaluation on Suitability of Robinnia Pseudoscacia Forests in Hill and Gully Region of Western Shanxi Province

晋西黄土丘陵沟壑区水土流失严重,气候干旱,生态环境恶劣,适应性和抗逆性很强的刺槐是该区重要的优良造林树种。建国以来,该区营造了大面积的刺槐林,但由于各立地类型的光、热、水、气、肥等条件不尽一致,其生长状况相差悬殊,有的甚至形成"小老树"。为了研究刺槐林的生态适宜性,在对不同立地条件下刺槐林生长状况调查的基础上,应用Verhanlst生长预测模型和模糊最优局势决策法进行了分析,发现刺槐林的生长状况与各立地条件的土壤水分变化基本一致,不同立地条件下刺槐林生长差异显著,同时筛选出适宜于营造刺槐林的最佳立地条件类型是梁峁阴坡和阴沟坡。

In the hill and gully region of the western Shanxi province, soil and water loss is very severe, the climate is very arid, and ecological environment is very vulnerable, so Robinnia pseudoscacia that has good suitability and antiadversity became the important and fine afforestation tree plant here. Since 1949, the large area of Robinnia pseudoscacia forests has been planted, but their growth statuses were very different from each other, some of the became the lower efficiency and productivity forests because of the different conditions of light, heat, water, air and fertilizer etc.In order to study the suitability of Robinnia pseudoscacia forests, based upon the survey on the growth statuses for different standing conditions, the Verhanlst growth prediction model and fuzzy optimum decisionmaking method had been used to analyze Robinnia pseudoscacia growth. The results showed that the growth of Robinnia pseudoscacia forests was ultimately accordant to the soil moisture change for different standing conditions, and the difference were significant for the growth of Robinnia pseudoscacia forest for different standing conditions. Also, the types of optimum standing conditions for Robinnia pseudoscacia forest were chosen: the northern hill slope land and northern gully slope land.