论文部分内容阅读
采用不同孔径(6目、30目和260目)枯落物袋,于2013年8月-2014年7月对多年生草本野青茅(Deyeuxia arundinacea)枯落物分解过程中土壤动物群落结构进行调查.结果显示:各孔径野青茅枯落物质量损失率均表现出先快后慢的规律,分解率排序为6目>260目>30目.实验共捕获土壤动物2 218只,其中,30目(958只)>260目(737只)>6目(523只),以甲螨亚目和跳虫科为优势类群,占总个体数的73.22%;在12个月的分解过程中,各孔径分解袋土壤动物个体密度和类群密度呈现相似的变化趋势和明显的季节动态分布;6目和260目分解袋土壤动物的类群密度无显著差异(P>0.05)(除5月外).相关性分析表明,土壤动物类群密度与气温和降雨量存在极显著相关(r=0.823,P=0.001;r=0.795,P=0.002),个体密度与气温呈显著相关(r=0.660,P=0.020).本研究结果表明,野青茅枯落物分解过程中,大型土壤动物的参与是影响野青茅枯落物分解速率的重要因子,水热条件是产生土壤动物群落结构及其多样性差异的主要因素.
The soil animal community structure during the decomposition of the litter of Deyeuxia arundinacea was investigated from August 2013 to July 2014 using litter bags with different pore sizes (6 mesh, 30 mesh and 260 mesh) The results showed that the rate of loss of litter in the leaves of each pore showed a trend of first and then slow, the decomposition rate ranked as 6 orders> 260 orders> 30 orders.A total of 2 218 soil animals were captured, of which 30 heads (958), 260 (737), and 6 (523). The dominant groups were Acreon and Tetranychidae, accounting for 73.22% of the total number of individuals. During the 12-month decomposition, The population density and population density of soil animal in pore decomposition bag showed similar trend and significant seasonal dynamic distribution. The population density of soil animal in 6-and 260-mesh decomposition bags had no significant difference (except for May). The results of sex analysis showed that there was a significant correlation between the density of soil fauna and temperature and rainfall (r = 0.823, P = 0.001; r = 0.795, P = 0.002) ). The results of this study show that the involvement of large soil animals in the process of litter decomposition is influenced by the litter decomposition rate To factor, hydrothermal conditions are the main factors and differences in community structure of soil animal diversity.