河北花岗岩丘陵地的立地特性与刺槐生长分析

刺槐在河北山地,主要分布在花岗岩丘陵地区.该区主要立地特点是干旱、土薄、养分贫乏.坡形影响水分、养分及土壤的再分配作用明显,是影响刺槐生长的主要立地因子.该区刺槐槐生长的突出特点是过早衰退.刺槐的良好生长要求充足的水分和养分供应,但该区刺槐的营养要求与实际供应之间存在很大差距;而且刺槐的根系分布浅,吸收空间小,对该区立地条件适应能力有限.在经营上应适应刺槐生长的特点,实行早期利用.

Growth Analysis of Black Locust and Site Characters of Hilly Granite Regions in Hebei Province

Black locust (Robinia Pseudoacacia L.) is mainly distibuted over the hilly granite regions of Hebei province.The main site characters are drought,thin soil and lack of adequate nutrition.The shape of slope that obviously affects the reallocation of water,soil and nutrition is the major site factor affecting tree growth.The principal character of the tree's growth in the region is it's decline in the early growth stages.To guarantee good growth of black locust,enough water and nutrition is needed.In this area,the site supplies cannot reach the demands,more over,the tree's root system is drstributed only in the upper layers of the soil.So the adaptation of black locust to the site is limited.As to the management of the stands of black locust,early utilization of the trees should be performed in line with the tree's growth characters.