三北防护林新无性系-美青杂种系列引进与苗期选择

INTRODUCTION AND SELECTION OF NEW CLONE SERIES OF POPULUS DELTOIDES×P.CATHAYANA

１９９８年春从中国林科院的实验点甘肃临夏回族自治州林科所引入北方型美洲黑杨（Ｐ．ｄｅｌｔｏｉｄｅｓ）×青杨（Ｐ．ｃａｔｈａｙａｎａ）杂种无性系 １３７个，扦插在内蒙奈曼旗兴隆沼林场二分场。１９９８年秋选出 １３个无性系，加入我地区新近确定的推广无性系──白城 ４１作对照，１９９９年建无性系测试圃，２０００年春平茬，２０００年秋对这 １３个无性系生长量和抗性的调查与评价，以白城 ４１为对照，初步选择出 １０个无性系，高生长较对照大 ３０％以上的有 ４个，２０％以上 ５个；径生长大 ５０％的 ３个，３０％以上 ２个，２０％以上 ４个；所有无性系的抗锈病情况都好于对照。为丰富三北地区营造杨树农田防护林品种和改善三北地区杨树品种单一的问题有望选出新无性系。

In the spring of 1998,137 clones of America black popla r(Populus deltoides×P.cathayana) were introduced from linxia Pref ecture of Gansu Province and planted by cuttage on XingLongzhao Forest Farm of N aiman County.In autumn of this year 13 clones were selected and put in experimen t plot,with Baicheng 41 to be the check.In autumn of 2000 growth and resistance of 13 clones were investigated and assessed:Height growth of 4 clones is by 30% more than the check,5 clones by 20%;Diameter growth of 3 clones is by 50% more than the check,2 clones by 30%,4 clones by 20%.Rust resistance of all the clones is better than the check.