柠条容器育苗在青海造林中的试验研究

Study on the Afforestation Experiment with Container Nursery of Caragana in Qinghai

[目的]为了提高造林质量、确保较高的造林成活率和保存率。[方法]以柠条种子为材料,采用单因素完全随机区组设计,研究了容器育苗对人工造林的影响。[结果]留袋处理的苗木成活率比破袋、去袋、裸根处理分别提高5.8%、11.5%、48.2%,苗高分别提高0.4%、1.2%、2.0%,根面积指数分别提高69.9%、109.8%、126.9%,高径比分别降低0.7、2.4、11.1。容器育苗120 d的苗木栽植成活率分别比容器育苗360和480 d提高11.4%和18.9%,苗高分别增加0.4和0.2 cm,根面积指数分别提高17.2%和25.8%,高径比分别降低0.8和22.7。丛植处理的苗木成活率分别比单植、双植、窄缝处理提高10.5%、6.3%、21.7%,苗高分别增加0.7、0.5、0.9 cm,根面积指数分别提高18.1%、3.7%、20.45%,高径比分别降低5.8、0.4、1.2。[结论]容器育苗的成活率和苗木质量比直播造林、裸根苗造林有显著提高。

[Objective] The purpose of the study was to enhance afforestation quality and ensure higher survival rate and preservation rate of afforestation.[Method] With caragana seeds as materials,the effect of container nursery on artificial afforestation was studied by single-factor completely randomized block design.[Result] Compared with bag breaking,bag removing and bare-rooted treatments,the seedling survival rate of bag retaining treatment was enhanced by 5.8%,11.5% and 48.2% resp.,its seedling height was enhanced by 0.4%,1.2% and 2.0% resp.,its root area index was enhanced by 69.9%,109.8% and 126.9% resp.and its height-to-diameter ratio was reduced by 0.7,2.4 and 11.1 resp.Compared with seedlings from container nursery for 360 and 480 d,the transplanting survival rate of seedlings from container nursery for 120 d was enhanced by 11.4% and 18.9% resp.,its seedling height was increased by 0.4 and 0.2 cm resp.,its root area index was enhanced by 17.2% and 25.8% resp.and its height-to-diameter ratio was reduced by 0.8 and 22.7 resp.Compared with single planting,double planting and narrow gap treatments,the seedling survival rate of clump planting treatment was enhanced by 10.5%,6.3% and 21.7% resp.,its seedling height was increased by 0.7,0.5 and 0.9 cm resp.,its root area index was enhanced by 18.1%,3.7% and 20.45% resp.and its height-to-diameter ratio was reduced by 5.8,0.4 and 1.2 resp.[Conclusion] Compared with direct seeding afforestation and bare-rooted afforestation,the survival rate and seedling quality of container nursery were enhanced significantly.