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山西蟒河国家级自然保护区人工油松林生态位特征

李燕芬1,铁军2,3**,张桂萍2,3,郭华1   

  1. 1 山西师范大学生命科学学院, 山西临汾 041004; 2 长治学院生物科学与技术系, 山西长治 046011; 3 太行山生态与环境研究所, 山西长治 046011)
  • 出版日期:2014-11-10 发布日期:2014-11-10

Niche characteristics of an artificial Pinus tabuliformis forest in Manghe National Nature Reserve of Shanxi.

LI Yan-fen1, TIE Jun2,3**, ZHANG Gui-ping2,3, GUO Hua1   

  1. (1College of Life Science, Shanxi Normal University, Linfen 041004, Shanxi, China; 2Department of Biological Sciences and Technology, Changzhi College, Changzhi 046011, Shanxi, China; 3Ecological and Environmental Research Institute of Taihang Mountain, Changzhi 046011, Shanxi, China)
  • Online:2014-11-10 Published:2014-11-10

摘要:

采用Levins生态位宽度、Pianka生态位重叠及生态位相似性指数,对山西蟒河国家级自然保护区人工油松林群落8种乔木、12种灌木和10种草本的种群生态位特征进行了分析。结果表明:乔木树种中油松(1.673)的生态位宽度值较大,其次为华山松(0.737)和侧柏(0.570);灌木树种中荆条(1.150)和黄刺玫(1.020)的生态位宽度值较大;而草本层生态位宽度最大的是苔草(1.520)和华北米蒿(1.200)。乔木、灌木和草本层各种群间均有不同程度的重叠,重叠指数依乔木、灌木、草本层逐渐增大。在乔木层中有2对物种的生态位重叠值>0.5,占总数的7.14%;灌木层中有9对物种的重叠值>0.5,占总数的13.64%;草本层中重叠值>0.5的物种对有7对,占总数的15.56%。总体上表现为生态位宽度大的物种,对资源的利用能力较强,与其他物种间的生态位相似性较高,生态位重叠较大。
 

关键词: 作物系数, 水分胁迫系数, 作物蒸腾, 日光温室, 土壤蒸发

Abstract: Using the formulas of Levins niche breadth, Pianka niche overlap and the niche similarity, we analyzed the niche characteristics of 8 trees, 12 shrubs and 10 herbs within a Pinus tabuliformis forest in Manghe National Nature Reserves of Shanxi Province. The results showed that in the tree layer, niche breadth of P. tabuliformis (1.673) was the greatest, followed by P. armandii (0.737) and Platycladus orientalis (0.570). Species with larger niche breadth were Vitex negundo var. heterophylla (1.150) and Rosa xanthina (1.020) in the shrub layer, and Carex chinensis (1.520) and Artemisia giraldii (1.200) in the herb layer. Different degrees of overlap existed among the various layers with a gradual increase from the overstory to the understory. In the overstory, there were 2 pairs of populations with niche overlap being higher than 0.5, accounting for 7.14% of total pairs. There were 9 pairs of populations with niche overlap being higher than 0.5 in the shrub layer, accounting for 13.64% of total pairs, and there were 7 pairs of populations with niche overlap being higher than 0.5 in the herb layer, accounting for 15.56% of total pairs. All in all, species with larger niche breadth had stronger resource utilization capabilities, and their niche similarity and niche overlap were greater than other populations.

Key words: solar greenhouse, soil evaporation, crop coefficient, crop transpiration, water stress coefficient