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不同种源草珊瑚杉木低效林复合经营的对比分析

Comparative Analysis of Under-forest Compound Management of Sarcandra glabra from Different Provenances in Low-efficiency Cunninghamia lanceolata Stands

  • 摘要: 针对庆元县针阔混交林分布广泛但林下空间利用率较低的现状,提出依托草珊瑚(Sarcandra glabra)林下复合经营模式挖掘林窗资源,构建“乔木-灌木-草本”立体经营体系,以提升林地生产力和生态经济效益。在杉木(Cunninghamia lanceolata)人工林林下连续2年种植6个种源草珊瑚,研究草珊瑚种源变异规律及生长特征。结果表明,草珊瑚不同种源的林下复合经营的保存率差异显著,其中庆元千岗坑、福建建瓯和福建三明3个种源的保存率在种植1年和2年后均可达到80%以上,相比本地对照种源(庆元白坑)保存率提升4%~13%。杉木林下种植草珊瑚,不同种源间的生长量具有显著性差异,同时受种源与重复试验交互作用影响。在6个不同种源中,庆元千岗坑和福建建瓯2个种源在林下种植第1年和第2年的苗高、地径生长表现最优,较对照组高出10.5%~23.8%,在种源重复试验中,在第一年6—9月庆元千岗坑本土适应性强、高生长潜力最大,年高生长量达90 cm;在第二年6—9月福建建瓯近地缘较好,地径最粗,地径年生长量达0.5 cm,是林下经营种植草珊瑚的优异种源。

     

    Abstract: To aim at the widespread distribution of mixed coniferous and broad-leaved forests and the low under-forest space utilization in Qingyuan County, an under-forest compound model based on Sarcandra glabra was established to exploit forest gap resources and build a tree-shrub-herb three-dimensional management system, thereby enhancing forestland productivity and ecological and economic benefits. S. glabra of six provenances were planted under C. lanceolata plantation for two consecutive years to investigate the provenance variation patterns and growth characteristics. The results showed that survival rates among provenances differed significantly under the compound model. The survival rates of three provenances( Qiangangkeng, Qingyuan; Jian’ou, Fujian; and Sanming, Fujian) reached more than 80% after one and two years of planting, representing the increase of 4% ~ 13% compared with those of the local control provenance (Baikeng, Qingyuan). It also showed that growth increment of different provenances exhibited significant differences (P<0.05), and were also affected by the provenance × replicate interaction. Among the six provenances, Qiangangkeng, Qingyuan and Jian’ou, Fujian provenances exhibited the best seedling height and ground diameter growth in both the first and second years, exceeding by 10.5% ~ 23.8% over those of the control. In the replicated provenance trial, S. glabra of Qiangangkeng, Qingyuan provenance showed strong local adaptability and height growth potential from June to September in the first year with an annual height increment of 90 cm. From June to September in the second year, S. glabra of Jian’ou, Fujian provenance had the largest ground diameter with an annual increment of 0.5 cm, therefore, it is an excellent provenance of S. glabra for under-forest cultivation.

     

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