不同有机物料对微域内土壤原生动物和线虫的影响

发布时间：2018-06-06 08:19

本文选题：有机物料 + 微域　；参考：《土壤学报》2017年03期

【摘要】：施用有机物料能够显著影响土壤肥力和生物群落结构,然而有机物料在土壤中分布不均会加剧土壤空间异质性,进而对土壤生物群落的结构和功能产生进一步的影响。选用水稻秸秆和白三叶草两类有机物料,按比例混合后装于网袋,置于预先装好土的培养容器中恒温培养,在培养的第14、35和70天分别对其中的不同微域(0~1 cm和1~5 cm)土样进行采集,分析其中的土壤原生动物和线虫群落结构的变化。结果表明,有机物料种类及培养时间对原生动物和线虫数量的影响更大,采样微域对二者的影响相对较小。水稻秸秆添加下的土壤植食性线虫、食真菌线虫和捕杂食线虫数量显著高于白三叶草添加;而白三叶草添加下的土壤变形虫、鞭毛虫和线虫总数、食细菌线虫数量显著高于水稻秸秆添加。从整个培养周期来看,鞭毛虫数量随培养时间的延长逐渐减少,而变形虫和线虫总数则随培养时间的延长逐渐增多。在同一有机物料下不同微域间土壤原生动物和线虫在培养初期会出现一定的数量差异,但这种差异随培养时间的延长逐渐消失。
[Abstract]:Application of organic materials can significantly affect soil fertility and biological community structure, but the uneven distribution of organic materials in the soil will aggravate the spatial heterogeneity of soil, and further affect the structure and function of soil biota. Two kinds of organic materials, rice straw and white clover, were mixed in a net bag and cultured in a pre-packed soil container at a constant temperature. The soil samples of different microdomains (1 cm and 1 5 cm) were collected on the 14th and 70th day of culture, respectively, and the changes of soil protozoa and nematodes community structure were analyzed. The results showed that the species of organic materials and culture time had more influence on the number of protozoa and nematodes, while the sampling microdomains had relatively little effect on the number of protozoa and nematodes. The numbers of phytophagous nematodes, fungal nematodes and omnivorous nematodes were significantly higher than those of white clover supplemented with rice straw, while the total number of soil amoeba, flagellates and nematodes added by white clover was significantly higher than that of white clover. The number of bacterial nematodes was significantly higher than that of rice straw. From the whole culture cycle, the number of flagellates decreased gradually with the extension of culture time, while the total number of amoeba and nematode increased with the extension of culture time. Under the same organic material, soil protozoa and nematodes would have a certain number difference in the initial stage of culture, but the difference gradually disappeared with the extension of culture time.
【作者单位】：南京农业大学资源与环境科学学院;江苏省农业科学院农业资源与环境研究所;
【基金】：国家自然科学基金项目(41371263) 土壤与农业可持续发展国家重点实验室开放课题(0812201218)资助~~
【分类号】：S154

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