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为了研究南亚热带人工林不同营造模式对土壤线虫群落的影响,于2013年7月在中国林业科学院热带林业实验中心林场分别选取针叶林(马尾松林、杉木林)、阔叶林(米老排、红椎林)及混交林(马尾松-红椎、马尾松-大叶栎),并对6种营造模式人工林的土壤线虫及土壤理化性质进行了调查。共鉴定线虫16853条,平均密度为1873条·100 g-1干土,隶属于2纲8目32科53属,其中基齿属、微咽属和金线属为优势属:PCA分析结果表明,杉木林与米老排林、马尾松-红椎混交林与红椎林的线虫群落结构相似性较高。线虫群落密度以马尾松-大叶栎混交林最大,红椎林和马尾松-红椎混交林较低,Shannon指数和均匀度指数均以马尾松林和米老排林较高,以马尾松-大叶栎混交林最低:成熟指数MI、PPI、PPI/MI指数和丰富度指数在不同经营模式间均无显著差异,而杂食-捕食性线虫、食细菌性线虫和植物寄生性线虫密度和WI指数差异显著。相关分析表明,土壤磷含量与植物寄生、食细菌、食真菌线虫显著相关,而土壤钾含量仅与杂食-捕食性线虫显著正相关。结果表明,6种经营模式对线虫组成和营养结构有明显影响,土壤磷和钾含量是影响线虫群落营养结构的主要因子。
In order to study the effects of different modes of planting on the soil nematode community in South Asia subtropical forests, coniferous forests (Pinus massoniana, Cunninghamia lanceolata), broad-leaved forests , Pinus tabulaeformis and Pinus massoniana) and mixed forest (Pinus massoniana - Pinus massoniana - Pinus massoniana). The soil nematodes and soil physical and chemical properties of six kinds of plantations were surveyed. A total of 16853 nematodes were identified, with an average density of 1873 · 100 g -1 dry soil, belonging to 53 genera of 32 families, 2 classes, 8 orders, of which genus Gemma, Phaeodactylum and Genus were the dominant genera: PCA analysis showed , Cunninghamia lanceolata forest and mie rowing forest, masson pine - red mixed forest and red vertebrate community structure similarity is high. The community density of C. elegans was the largest in Pinus massoniana-Quercus mongolica mixed forest, while the distributions of Pinus massoniana-Pinus massoniana-Pinus massoniana mixed forest were lower. The Shannon index and evenness index were higher in Pinus massoniana forest and M. milanoides forest. The minimum of M. oak mixed forest: Mature index MI, PPI, PPI / MI index and richness index had no significant difference among different management modes, but omnivore-predatory nematode, bacterial-eater nematode and plant parasitic nematode density and WI The index difference is significant. Correlation analysis showed that soil phosphorus content was significantly correlated with plant parasitism, edible bacteria and fungus nematode, but soil potassium content was only positively correlated with omnivore - predatory nematode. The results showed that the six management modes had significant effects on the composition and nutrition structure of nematodes. The contents of soil phosphorus and potassium were the main factors affecting the nutrition structure of nematode community.