杉木二代优良种源造林试验研究

Study on Afforestation Test of Second-generation Superior Provenances of Cunninghamia lanceolata

采用杉木第二代种子园优良种源的种子育苗,在永春县营造二代杉木示范林,开展杉木良种推广应用,并在一都镇和坑仔口镇分别设置调查试验区,调查分析二代杉木幼林的遗传增益和集约造林的速生丰产效应。试验结果:1)杉木第二代种子园优良种源在永春推广造林具有较高的遗传增益,与普通种源的杉木相比,3年生树高生长量增长31.0%,胸径生长量增长52.1%;4年生树高生长量增长31.5%,胸径生长量增长45.2%。2)二代杉木幼林集约造林速生丰产效应明显,4年生幼林施肥比不施肥树高生长量增长33.3%,胸径生长量增长53.3%;高密度造林5年生二代杉木幼林蓄积量达到87.75 m3/hm2,年平均材积生长量达到17.55 m3/hm2,年平均产值达到15 795元/hm2。

Seed seedling was carried out by superior provenances in the second-generation seed orchards of Cunninghamia lanceolata in Yongchun County,demonstration forests of second-generation C.lanceolata were planted.Popularization and application of C.lanceolata superior seeds were carry out,investigation test are a were set at Yidu Town and Kengzikou Town,the genetic gains of young forests of second-generation C.lanceolata and fast-growing and high-yielding effects of intensive afforestation were investigated and analyzed.The results showed that： 1） the popularization for afforestation by superior provenances in the second-generation seed orchards of C.lanceolata in Yongchun County has high genetic gains,and compared to ordinary C.lanceolata provenances,height growth of 3 years old trees increased 31.0%,diameter growth and volume growth of 52.1%;height growth of 4 years old trees increased 31.5%,diameter growth and volume growth of 45.2%.2） The fast-growing and high-yielding effects of intensive young forests were obvious,tree height growth with fertilization in 4-year-young forests increased than without fertilization of 33.3%,diameter growth and volume growth of 53.3%;Volume of high-density afforestation by 5 years old second-generation C.lanceolata forests amounted to 5.85 m3/67m2,the average annual volume growth reached 1.17 m3/667m2,the average annual output value was $1 053/ 667m2.