美黑×青杨萌蘖更新技术研究

Sprouting of Populus deltoides×P.cathayana

针对人工美黑×青杨成熟防护林存在的生长衰退、防护功能下降、急需更新改造等问题，利用杨树本身的繁殖特性，通过近10a的试验，从更新林分的条件、更新方式的选择、萌生植株管理、促进根蘖繁殖的覆土和灌溉措施以及投入成本等方面对美黑×青杨萌蘖更新进行了研究与分析，结果表明：根蘖繁殖更新效果明显优于萌芽更新和植苗更新，成活率提高13％，高生长提高33.7％-54．9％，单位面积造林成本较常规造林降低了54．6％，并提出了有效的根蘖繁殖更新配套技术。

Aiming at problems （growth declination,production function reduction,be in urgent need of transformation and renovation ） of artificial Populus dehoides × P. cathayana, using propagation characteristics of poplar, sprouting of Populus dehoides × P. cathayana were studied and analyzed from ways （regeneration condition, regeneration mode selection, regenerated plant management,recovering measures of accelerating sprouting and cost input ）. The results show that the effect of sprouting is superior significantly to planting regeneration. The survival rate increases by 13%, tree height increases by 33.7% -54.9%, forestation cost per unit area decreases by 54.6% compares with conventional afforestation. Effective complete set of regeneration techniques of sprouting are proposed.