摘要
空间格局反映了种群生物学特性、种内种间关系以及环境异质性等因素的综合作用。通过对陕西4个地市1997年飞播油松成苗期空间格局研究证明,RPA和对照区油松均呈聚集分布。其中,RPA处理油松聚集对密度依赖性较高,环境异质性对聚集度作用较小;而对照聚集对密度依赖性较低,环境异质性的影响较大。飞播造林初期,油松密度高,油松具有均匀分布的趋势;随着林木增长,油松密度降低,林内油松聚集度逐渐增强。但由于RPA促进了苗木抗逆性,有苗样方频度和苗木保存量明显提高,聚集度较低。而对照有苗样方大量减少,油松分布相对集中,聚集度增强,均匀度降低。表明RPA拌种可有效降低飞播后油松分布聚集程度,扩大油松在林地适宜生存范围,提高林地利用率。
The spatial pattern（SP）was the result of integrated effects of the factors of population biological characteristics,the intra-and inter-specific interactions and the environmental heterogeneity.The SP of Pinus tabulaeformis plantations in their seedling formation period was examined,which were planted by aerial seeding in 1997 in four areas in Shaanxi.During the aerial seeding,the seeds were treated by RPA or without RPA（control）.The differences in SP of the two treatments were compared.The results demonstrated that the both SP exhibited aggregation distribution.The aggregation of RPA treatment demonstrated higher density dependence,while environmental heterogeneity presented lower influence on the aggregation.The aggregation of the control however,demonstrated lower density dependence,environmental heterogeneity presented higher influence on the aggregation.In the initial stage of aerial seeding,the density was high,and the distribution tended to be even.The density decreased with the time,and the aggregation degree gradually increased.Because RPA treatment promoted the seedling resistance,the frequent-ness of sample plots with available seedlings and the quantity of available seedling were significantly improved,aggregation degree was low.While in the control,the frequentness of sample plots with available seedlings significantly reduced,aggregation degree increased,uniformity reduced.It was concluded that the RPA treatment could effectively reduce the aggregation degree of P.tabulaeformis in aerial seeding,expanded the growth range of Pinus tabulaeformis in forest land,and improved land utilization.
出处
《西北林学院学报》
CSCD
北大核心
2015年第2期51-58,共8页
Journal of Northwest Forestry University
基金
国家林业公益性行业专项(201404405)
国家林业局重点项目(2012-02)
关键词
多效抗旱驱鼠剂
飞播造林
油松
空间格局
RPA
afforestation by aerial seeding
Pinus tabulaeformis
spatial pattern
作者简介
李建春，男，高级工程师，研究方向：飞播造林。Email：lijianchun@163．com
通信作者：韩崇选，男，教授，研究方向：森林鼠害治理。E-mail：sendakingcat@qq．com
