中国刺槐次生种源对环境适应性比较分析

Adaptive Capacity Comparison of Black Locust(Robinia pseudoacacia L.) Provenances in China

在河北省生态条件下,对我国19个刺槐(Robinia pseudoacacia L.)次生种源5个年度的生长状况进行了调查,将各刺槐种源连续5a的存活率、第5年的树高和胸径数据进行了多重比较,采用隶属函数值方法综合评价刺槐种源,并比较了刺槐次生种源对立地条件的适应性。结果表明:刺槐次生种源生长第3年后,存活率出现显著性差异;经过5个生长年度,种源4的存活率最高,为83.33%,种源15、16的存活率最低,均为53.33%;种源17的树高平均值和胸径平均值都最大,分别为6.61 m和5.48 cm;种源2的树高平均值最小,为5.65 m;种源4的胸径平均值最小,为4.28 cm。综合考虑各种源的树高、胸径及存活率,种源17的隶属度平均值最大,为0.888 9,说明种源17在本地适应程度最好;种源16的隶属度平均值最小,为0.184 0,说明种源16在本地适应程度最差。

Nineteen black locust （Robinia pseudocacia L. ） provenances in China were planted at Hebei ecozone. The morpho- logical growth traits were surveyed on each autumn in consecutive five years from 2005. The annual survival rate of five years, the tree-height and breast-height diameter in the fifth year were discussed according to the results of multiple com- parison analysis. Combined with subordinate function method, a comprehensive evaluation was conducted on each prove- nance and the adaptability of the ecological condition was compared. After three years＇ self-thinning, there were signifi- cant differences among the survival rate of nineteen black locust provenances. After five years growing, Provenance 4 had the highest survival rate of 83.33% , and Provenance 15 ＆ 16 had the smallest survival rate of 53.33%. The mean tree- height and mean breast-height diameter of Provenance 17 were 6.61 m and 5.48 cm, respectively. The smallest mean tree height was 5.65 m for Provenance 2. The smallest breast-height diameter was 4.28 cm for Provenance 4. Considering the morphological growth traits, the membership degrees and membership degree ranking orders, Provenance 17 had the high- est membership degree of 0.888 9, indicating that Provenance 17 had the highest adaptive capacity to the Hebei ectone in five years. Provenance 16 had the smallest membership degree of 0. 184 0 with relatively weakest competitive ability among nineteen provenances at Hebei ectone.