3种造林树种轻基质网袋容器苗造林效果分析

选用木荷(Schima superba)、青冈(Cyclobalanopsis glauca)和湿地松(Pinus elliottii)3种主要造林树种,在采伐迹地、林冠下和生物防火林带3种不同类型栽植地上开展1～2年生轻基质网袋容器苗与裸根苗的造林对比试验。结果表明,轻基质网袋容器苗造林能显著地提高3树种的造林成效,在不同栽植地类型下3树种不同苗龄容器苗的造林成活率和保存率较裸根苗造林提高了27.6%～1421.8%,树高、地径、当年抽梢长及干物质积累量等生长性状较裸根苗造林提高了22.0%～86.7%。1年生容器苗可进行周年造林,在2月、5月和9月的造林成活率分别为93.8%～98.0%、90.7%～96.3%和84.5%～89.4%,皆能达到造林合格率的要求,而1年生裸根苗在5月和9月的造林成活率仅分别为26%～53%和10.4%～34.4%,无法达到造林合格率的要求。经比较分析,3树种1年生容器苗的造林成本较裸根苗低10.3%～18.4%,2年生容器苗的造林成本较裸根苗低7.1%～14.4%。采用轻基质网袋容器苗造林,不仅造林成活率高,生长优势明显,而且造林成本低,宜在绿化造林中大力推广。

Afforestation Effect of Three Species of Seedlings Growing with Light Media in Net Container

A comparative trial of afforestation of annual and biennial container seedlings growing with light media and bare root seedlings in three different site types was conducted to study the differences in survival rate,preservation rate and seedling growth of three important afforestation species,Schima superba,Cyclobalanopsis glauca and Pinus elliottii.Result showed that the afforestation effect could be significantly improved by using the seedlings growing with light media in net container.The survival rate and preservation rate of different species of container seedlings were 27.6%-1421.8% higher than those of bare root seedlings in different types of sites(cutting blank,land under the canopy and biological fire belt).Seedling height,stem diameter at ground level,length of current-year tip and accumulated amount of dry matter of container seedlings of different species were 22.0%-86.7% higher than those of bare root seedlings.The survival rates of the annual container seedlings of three species planted in February,May and September ranged from 93.8% to 98.0%,90.7% to 96.3% and 84.5% to 89.4%,respectively,all of which meet the demand for qualification rate of afforestation and ensured the possibility of afforestation all the year round.However,the survival rates of the annual bare root seedlings planted in May and September only reached 26%-53% and 10.4%-34.4%,respectively,which were much lower than the qualification rate of afforestation.The afforestation costs of the annual and biennial container seedlings of different species were 10.3%-18.4% and 7.1%-14.4% lower than those of the bare root seedlings,respectively.It is concluded that afforestation with seedlings growing with light media in net container should be broadly popularized,for it has many advantages such as high survival rate,growth dominance and low cost.