苏北平原河堤杉木栽培种源选择的研究

在苏北宝应县平原河堤进行的５５个产地杉木种源造林试验表明，种源间适应性、抗性与生长性状多有显著的统计差异．性状变异与产地纬度、经度有明显的负相关关系，受纬度与经度双重影响渐变。产地温度和湿度是种源产生性状变异的主要作用因子．种源选择具有较高增产潜力．选择四川洪雅、邻水、永川、彭县，广东乐昌、信宜，广西融水、那坡、浦北，福建大田，湖南祁阳，江西安乐、全南等２２个种源造林，１２年生小径材蓄积比江苏对照杉木（宜兴产地）增加３５．８４～１６９．９８ｍ３／ｈｍ２，蓄积表型增益达３３．７９％～１６０．５４％，遗传增益达１０．３６％～４９．２１％．

A Study on Chinese Fir Provenance Selection for Plantation on Canal Banks in Northern Jiangsu Plain

Chinese fir (Cunninghamia lanceolata) of 55 provenances have been planted on the canal banks in Baoying County for the past 12 years and the results show that there are significant differences in their adaptation,resistance and growing characters;that their characteristic variation bears an obvious negative correlation with the latitute and longitute,with the main factors being temperature and humidity,and the geographic variation being influenced by both latitute and longitute; and that to select the excellent provenance has a comparatively high increment potentiality.The 12-year-old plantation of 22 provenances were selected from total 55 provenances, such as from Hongya, Lingshui, Yongchan of SichuanProvince;from Lechang, Xingyi of Guangdong Province; from Yongshui, Napo and Pubei of Guangxi Province;from Qiyang of Hunan Province; from Datian of Fujian Province; and from Le'an and Quannan of Jiangxi Province,with its volume having, compared with CK (Yixin of Jiangsu Province), increased by 35.84～169. 98m￣3/hm￣2, its phynotipic gain by 33.79%～160. 54% and its genetic gain by 10. 36%～49. 21 %.