不同树龄枣园节肢动物群落时间结构及动态研究

Temporal Structure and Dynamics of the Arthropod Communities in Different Age's Jujube Orchard

调查了2种不同树龄枣树的枣园内节肢动物群落的组成及数量变化,应用回归分析、主分量分析等方法分析了枣园节肢动物群落在时间过程中的主导因素。结果表明:幼龄枣树节肢动物群落中,无论物种数、还是个体数均大于老龄枣树,随着季节的变化,节肢动物群落中的物种数与个体数也发生不同的波动。老龄枣园中,影响节肢动物群落多样性的主要成分是个体数量,而幼龄枣园中,影响节肢动物群落多样性的主要成分是个体数量和均匀性。老龄、幼龄枣园节肢动物群落前2个主分量的累计贡献率均在85%以上。可见不同树龄枣树空间结构的差异,可导致节肢动物群落结构与时序动态的差异。

The variation of species and individual numbers of the arthropod communities in two types of jujube orchard were investigated. The regression analysis and principal component analysis were used for studying the main factors during seasons. The results showed that number of both species and individuals of arthropods were more in the jujube orchard of young jujube trees than that in old jujube trees. There were some changes of both species and individuals of arthropods with changing saeson in the two different age＇s jujube trees. The main component of changing the diversity of arthropod community was individual number in old jujubes, and was both individual number and evenness in young jujubes. The accumulative contributing rates of preceding two main ponderance of arthropod community in both old and young jujubes were more than 85%. It is obvious that the jujube tree ages resulted in the differencs of arthropods both community structures and temporal dynamics.