海南木麻黄优良无性系筛选试验研究

针对海南木麻黄人工林出现无性系品种单一,生产力退化,防护效能衰退等问题,通过选用63个木麻黄优良无性系为试验材料,并进行7年的试验观测,筛选出适应海南不同地区的优良品种。33号、28号、17号、14号、4号、21号和34号等7个无性系具有较强的抗风与抗涝性,经强台风的袭击后仍保持95%的保存率;而1号、53号、54号、41号和10号等5个无性系具有较强的耐高温和耐旱性,在西部典型的干旱地区,保存率为85%以上;21号、34号和17号等3个无性系较为适合海南东部地区种植的优良无性系,7年生综合评价指标平均每亩蓄积量达16.3 m3～17.4m3;西部干旱地区优良无性系为41号、38号;北部砖红壤地区的优良无性系为9号、3号、36号、38号。

Selection of superior casuarinas clones in Hainan

Poor productivity and degraded protective efficiency of Casuarina shelterbelts in Hainan which was attributed to large-scale application of single casuarinas clone have attracted extensive attentions.In this study,sixty three casuarinas clones were collected to conducted clonal test trials in four sites,aimed to select superior clones suitable for different regions of Hainan based on 7-year growth measurements and comparisons of clones.According to analyses of data obtained,it was found that clones of No.33,28,17,14,4,21,34have better resistance against typhoon and waterlogging than other clones,and 90% survival was recorded after attacking of strong typhoon;However,clones of No.1,53,54,41,10 possess stronger tolerance against high temperature and drought than other clones,and survival rate reached up to 85% in dry West of Hainan.Based on results of four trial sites,superior clones of No.21,34,17 which average volume reached 244.5 m3～261.0m3 per ha at 7-year age are suitable for east regions of Hainan,clones that suitable for dry West of Hainan are No.41 and 38,and clones that suitable for Latosol lands in North of Hainan are No.9,3,36,38.