闽江源杉木退化人工林修复改造效果

Effect Analysis of Restoration and Reconstruction of Degraded Cunninghamia lanceolata Plantation in Minjiangyuan Region

通过对福建省建宁县闽江源多代连栽的杉木退化人工林进行修复改造试验,分析不同技术措施对杉木林生长的影响。结果表明:采取择伐+林下套种(Ⅰ)、疏伐+施肥(Ⅱ)和割灌除草+修枝+施肥(Ⅲ)3种修复改造技术措施,对闽江源杉木退化人工林有较好的促进生长和修复作用。通过3种技术措施,杉木林分树高、胸径和单株材积等生长情况和生物量较CK相比均有明显增长。采用割灌除草+修枝+施肥(Ⅲ)的杉林平均胸径、树高和单株材积较CK增加最大,分别达到18.22 cm、17.47 m和0.150 1 m^(3)。

The effects of different technical measures on the growth of degraded Cunninghamia lanceolata plantation in Minjiangyuan region of Jianning County,Fujian Province were analyzed through restoration and reconstruction experiments.The results showed that selective cutting+understory interplanting(Ⅰ),thinning cutting+fertilization(Ⅱ)and cutting,irrigation and weeding+pruning+fertilization(Ⅲ)had good effects on growth promotion and restoration of degraded C.lanceolata plantation in Minjiangyuan region.The growth of height(DBH),volume and biomass of C.lanceolata stand were significantly increased compared with the untreated stand by three technical measures.Compared with the control group,the average DBH,tree height and volume per plant increased the most in the treatment of cutting irrigation weeding+pruning+fertilization(Ⅲ),reaching 18.22 cm,17.47 m and 0.1501 m^(3),respectively.