赤峰市敖汉旗五种林分改造模式评价

Evaluation on Five Kinds of Forestation Models in Aohan Banner of Chifeng

以内蒙古赤峰市敖汉旗大五家流域内的5种人工林改造模式为研究对象,通过对5种模式的直径分布、大小差异、空间隔离度分布格局等进行评价。结果表明:保留原有林的伐劣补灌的模式见效最快,短期内的效果最好;更新树种的针阔混交改造模式居中,短期效果不明显,但具有长期发展的潜力;更新树种的乔灌混交改造模式表现较差,树种空间结构不合理,需要加强人工的抚育管理;未经改造的小叶杨纯林表现出了明显的劣势,因此必须进行更新改造,才会改善低功能林的现状。

With 5 kinds of forestation models of artificial forests in five basins of Aohan Banner,Chifeng City of Inner Mongolia as the research objects,the distribution of diameter,discrepancies of scale（neighborhood comparison）,the distribution patterns of spatial isolation of 5 kinds of models were evaluated.The results showed that the mode showed the most immediate and best effects in short period in which the original forest was retained as a whole with the aged trees logged and irrigation supplemented.The short term effects wasn＇t remarkable in the reconstruction of mixed coniferous broad leaved forest with updated species,but its potential for long term development was promising.It was anything but moderately satisfying in the reconstruction of the mixed arbor and shrub by updating the species because of the improper spatial structure,and thus required the intensified artificial management.There was a manifested disadvantage in intact pure Populus simonii forest which had to be reconstructed in order to improve the status.