【摘要】 豫南西平41个黑杨无性系5年生试验材料表明:参试黑杨无性系胸径、树高、材积差异达极显著水平,用综合座标法评定了它们的优劣,选择出4个优良无性系,它们的平均材积生长比现在生产中常用的4个品种平均值增加54 98%。更多还原

【Abstract】 THE PAPER ANALYZED THE RESULTS OF 41 FIVE-YEAR-OLD BLACK POPLAR CLONES GROWN IN XIPING COUNTY,SOUTHERN OF HENAN PROVINCE.THE RESULTS SHOWED THAT THERE WERE HIGHLY SIGNIFICANT DIFFERENCES ON HEIGHT.VOLUME AMONG THE TESTED CLONES.WITH THE METHOD OF SYNTHETIC COORDINATE,FOUR FINE CLONES WERE SELECTED.THE AVERAGE VOLUME OF THESE CLONES WAS 54.98% BIGGER THAN THAT OF THE PRESENT COMMON VARIETIES.更多还原