中山杉系列新无性系区域试验

Regional tests of new clones of Zhongshanshan

报道了国家级审定品种落羽杉中山302号（Taxodium distichum×T．mucronatum）与其父本墨西哥落羽杉（T．mucronatum）回交代选育出的新无性系的年生长节律和在3种立地类型条件下的区域试验结果。通过4年的造林对比试验结果表明：在长江滩涂低洼湿地上，中山118号、102号和9号3个新无性系生长表现优于对照母本落羽杉中山302号。它们的平均单株立木材积生长量分别为中山302号的231．8％，147．0％和145．0％。在太湖流域平原农区，中山118号、9号、24号、102号、1号和160号等6个新无性系生长优于对照亲本，它们的平均单株立木材积生长量，依次为中山302号的188．1％、273．3％，186．2％、270．7％，155．1％、225．3％和墨西哥落羽杉的143．1％、208．0％，128．4％、186．7％，110．1％、160．0％。在滨海滩涂盐碱条件（土壤pH值8．5，含盐量0．1％，有机质含量0．35％）下，中山27号、136号、118号、24号、1号等5个新无性系的立木材积生长量均显著地超过2个对照亲本，为中山302号的163．8％～241．9％和墨西哥羽杉的330．8％～488．5％。不仅显示出它们比中山302生长快，而且反映出有些新无性系具有与中山302号相似的或更强的耐盐碱适应力，可与中山302号一起在我国东南沿海滩涂盐碱地区造林推广。

We report more than 10 new clones＇ annual growth rhythm and their regional test results under the conditions of 3 kinds of site classification in this artMe. These new clones were got from the breeding generations which were produced by backerossing Taxodium distichum × T. mucronatum 302 and T. mucronatum. The four-year＇ s forestation contrast test results showed： on Yangtze River＇s bow-lying shoal wetland,such new clones as Zhongshan 108,102 and 9 performed better than the contrast maternal plant （ T. mucronatum Zhongshan 302 ）. Their average individual plant volume growth were respectively 231.8%,147.0% and 145.0% of Zhongshan 302. And in the plain agricultural areas of Tai Lake basin, such 6 new clones as Zhongshan 118,9,24,102,1 and 160 performell better than the contrast maternal plant. Their average individual volume growth were respectively 188. 1% , 273.3% , 186. 2% , 270. 7% , 155. 1% and 225.3% of Zhongshan 302 and 143. 1% ,208.0% , 128.4% , 186.7% , 110. 1% and 160% of T. mucronatum. And under the condition of coastal beach saline-alkaline （soil pH8.5, salinity 0. 1% , organic matter content 0. 35% ） , As for five new clones of Zhongshan 27,136,118,24 and 1 ,their stand volume growth are all exceeded the two contrast parents, with 163.8% - 241.9% of Zhongshan 302 and 330. 8% - 488.5% of T. mucronatum respectively in detail, showing that these 5 new clones grew faster than Zhongshan 302,and similar salt adaptability to or a little stronger than Zhongshan 302. And it is concluded that they could be planted with Zhongshan 302 in saline-alkaline areas southeast coastal beach in China.