防护林对沙地平欧杂种榛生长的影响

Effects of Protection Forest on Growth of Corylus heterophylla × C.avellana in Sandy Land

以防护林内栽植的达维、辽榛3号、辽榛7号等平欧杂种榛为试验对象,通过对4年生杂种榛生长情况的调查,结果表明:防护林对沙地平欧杂种榛生长具有一定影响,有防护林保护的幼树保存率比无防护林保护的高17.7个百分点;在树高、地径、平均冠幅、1年生枝生长量方面,有防护林保护比无防护林分别高15.5%、20.9%、16.3%、13.8%;有防护林保护下,全活占76.3%,比无防护林保护提高17.0个百分点;全死占3.2%,比无防护林保护降低11.7个百分点;1/3至全枯占20.5%,比无防护林保护降低5.3个百分点;3个品种的平均活雄花序数量,有防护林保护是无防护林保护的3.47倍,数量多15.0个·株^-1;而平均死雄花序数量,有防护林保护是无防护林保护的38.2%,数量少13.8个·株^-1;3个品种的单株产苗数,有防护林保护是无防护林保护的1.43倍。

Taking Corylus heterophylla ‘Dawei’, Corylus heterophylla ‘Liaozhen No. 3’ and Corylus heterophylla ‘Liaozhen No. 7’ as test objects, the growth of 4-year-old hybrid hazelnut in sandy land was investigated.Result shows that: Protection forest has certain effect on growth of hybrid hazelnut in sandy land. The preservation rate of young trees under shelterbelt protection is 17.7 percentage points higher than that without protection forest, and 15.5%, 20.9%, 16.3%& 13.8% higher than that without protection forest in tree height, ground diameter, average crown width &annual branch growth, respectively;the total survival rate under protection forest are 76.3%& 17.0 percentage points higher than that without protection forest. The death rate is 3.2%, 11.7 percentage points lower than that without protection forest;1/3 to total withering rate are 20.5%, 5.3 percentage points lower than that without protection forest;the average number of living male inflorescence of three varieties without protection forest is 3.47 times higher than that without protection forest, 15.0 per plant;and the average number of dead male inflorescence under protection forest is 38.2% and 13.8 per plant less than that without protection forest. The number of seedlings per plant of the three varieties under protection forest is 1.43 times higher than that without protection forest.