發(fā)布時間：2018-12-29 08:47

【摘要】：【目的】分析種植年限對蕉柑根際土壤線蟲群落組成與結構特征的影響,探明不同種植年限的蕉柑根際土壤線蟲群落多樣性與營養(yǎng)類群分布差異的成因。【方法】五點采樣法采取土樣,淺盤法分離提取線蟲,運用生態(tài)學指數和主分量分析的PCA排序相結合的方法處理數據�！窘Y果】(1)小樹齡蕉柑根際土壤線蟲群落的個體密度、屬數、多樣性指數和豐富度指數均顯著高于大樹齡蕉柑樣地(P0.05)。(2)PCA排序分析表明,食真菌線蟲和大多數食細菌、捕食性/雜食性線蟲主要分布在小樹齡蕉柑樣地,植食性線蟲主要分布在大樹齡蕉柑樣地。(3)相關性分析表明,蕉柑種植年限與土壤環(huán)境因子、線蟲總密度、線蟲屬數、生態(tài)學指數及食細菌和食真菌線蟲、捕食/雜食性線蟲密度呈極顯著或者顯著負相關,與植食性線蟲密度呈顯著正相關。(4)大樹齡蕉柑根際土壤線蟲的PPI值和PPI/MI指數顯著高于小樹齡蕉柑樣地(P0.05)。WI和NCR指數表明,小樹齡蕉柑樣地土壤健康程度優(yōu)于種植年限長的大樹齡蕉柑樣地,小樹齡蕉柑樣地土壤有機質的分解途徑以細菌為主�！窘Y論】果樹種植年限的延長會改變土壤的養(yǎng)分與結構,從而降低蕉柑根際土壤線蟲密度和群落的多樣性,對蕉柑根際土壤線蟲各營養(yǎng)類群的結構及分布產生趨向性影響。
[Abstract]:[objective] to analyze the effect of planting years on the composition and structure of nematode community in rhizosphere soil of banana mandarin. To find out the causes of the diversity of nematode communities and the distribution of nutrient groups in rhizosphere soil of Canna mandarin with different planting years. [methods] five point sampling method was used to separate and extract nematodes from soil samples and shallow disc method was used to separate and extract nematodes. The method of combining ecological index and PCA sequence of principal component analysis was used to process the data. [results] (1) individual density, genus number of soil nematode community of young banana orange rhizosphere, The diversity index and richness index were significantly higher than those of Canna mandarin (P0.05). (2) PCA sequencing analysis. The results showed that the predatory / omnivorous nematodes were mainly distributed in the small tree age banana mandarin plots. Phytophagous nematodes were mainly distributed in mandarin plots. (3) correlation analysis showed that the planting years of banana and mandarin were related to soil environmental factors, total density of nematode, number of nematodes, ecological index, bacteriophagous and fungal nematode. The density of predatory / omnivorous nematodes was significantly or negatively correlated. (4) the PPI value and PPI/MI index of rhizosphere soil nematode were significantly higher than those of young plantlets (P0.05). WI and NCR index). The soil health degree of small tree age banana citrus plot is better than that of big tree age citrus sample land, and the decomposition pathway of soil organic matter of small tree age banana citrus sample land is bacteria. [conclusion] the prolongation of fruit tree planting life will change the soil nutrient and structure. Therefore, the density and diversity of nematodes in rhizosphere soil were reduced, and the structure and distribution of vegetative groups of nematodes in rhizosphere soil were influenced.
【作者單位】： 韓山師范學院食品科學工程與生物科技學院;
【基金】：廣東省科技廳產學研結合項目專項(2010B090400010) “廣東省特色重點學科(生物學)”建設項目
【分類號】：S154;S666

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