生态环境学报Issue(1)：73-79,7.
厚荚相思和尾叶桉人工林土壤线虫群落研究
Soil nematode community in Acacia crassicapa and Eucalyptus urophylla plantations
摘要
Abstract
Wide areas of Acacia crassicapa and Eucalyptus urophylla were planted in South China recently due to their rapid growth, strong tolerance and suitability for paper pulp. However, it is still not clear how these two tree species impact soil biodiversity and fertility. It is necessary to evaluate their soil health condition scientifically. The number and variety of soil nematodes are abundant. Soil nematodes occupy the key positions in trophic levels of soil food web and are sensitive to environmental changes. As indicator of soil health, nematodes are used in ecology widely. In this study, soil nematodes were investigated in young Acacia crassicapa and Eucalyptus urophylla plantations with different seasons and sampling positions, to analyze the patterns of soil nematode individuals, community composition and diversity index, as well as relationships with environmental factors. The main results showed that:(1) Total nematode individuals in Acacia crassicapa plantation were 674.1/100 g dry soil, more 28.3%than Eucalyptus urophylla plantation significantly. Percentages of bacterivores in Acacia crassicapa plantation were more 6.3%than Eucalyptus urophylla significantly. (2) Community composition of soil nematodes varied with the season. The percentage of bacterivores increased, whereas the percentage of plant parasites decreased in wet season. Diversity index decreased from 0.87 in dry season to 0.75 in wet season. Statistic differences were all significant. (3) Nematode density in rhizosphere was more 89.1%than non-rhizosphere which attributed to accumulated organic carbon and nitrogen in rhizosphere. In conclusion, Acacia crassicapa plantation provide optimal environment for soil free living nematodes, whereas soil acidification do not happen in young forest period. For ecological effects of Acacia crassicapa plantation are superior to Eucalyptus urophylla, planting areas of Acacia crassicapa may be expanded in South China in future.关键词
指示生物/营养类群/外来物种/根际/生态效应Key words
biological indicator/trophic level/exotic species/rhizosphere/ecological effects分类
农业科技引用本文复制引用
赵灿灿,王伟..厚荚相思和尾叶桉人工林土壤线虫群落研究[J].生态环境学报,2014,(1):73-79,7.基金项目
国家自然科学基金项目(31200408) （31200408）
