排序方式: 共有49条查询结果,搜索用时 17 毫秒
21.
22.
泥鳅扰动对水田沉积物颗粒垂直分布的影响(英文) 总被引:1,自引:0,他引:1
[Objective] The purpose of this study was to investigate the role of breeding Misgurnus anguillicaudatus in paddy field in vertical distribution of sediment particles. [Method] Using chemically stable glass beads as tracers, the effects of Misgurnus anguillicaudatus bioturbation on the vertical distribution of sediment particles in paddy field were investigated, and the bioturbation role of benthic fish in the coupling process of benthic-pelagic interface was discussed. [Result] After ten days of Misgurnus anguillicaudatus bioturbation, 43.2% of the glass beads on the surface were transferred downwardly with the maximum distance of 7.5 cm, and the vertical transportation rate of sediment particles was 7.676×10-4g-1·cm-2·d-1. At a depth of 6 cm, 39.7% and 9.9% of the glass beads were respectively transferred upwards and downwards, to the maximum distanc of 4.5 cm and 5.1 cm, respectively; and the vertical transportation rates of sediment particles were 7.597×10-4g-1·cm-2·d-1 and 1.894×10-4g-1·cm-2·d-1, respectively. [Conclusion] Misgurnus anguillicaudatus bioturbation could promote the circulation and transformation of nutrients at water/soil interface through affecting the vertical distribution of sediment particles. 相似文献
23.
24.
25.
蛤蚧属于较高等的,真正的陆生脊椎动物。它在构造发育和生态学各方面有许多与两栖类截然不同的特点,在内脏各系统主要表现为以下几个方面:1.随着颈的分化明显和延长,其食道,气管相应加长。胃开始出现S型扭曲,在大肠和小肠交界处出现了盲肠;2.出现了支气管,支气管的出现进一步完善了肺的机能,使成体肺成为专一的呼吸器官。3蛤蚧成体的后肾,输精管和输尿管分开,使泌悄器官和生殖器官相对分离,各成体系执行专一的生理 相似文献
26.
27.
水丝蚓对稻田土壤微生物的影响 总被引:1,自引:0,他引:1
通过野外采样和室内控制试验,初步研究了底栖动物水丝蚓对稻田土壤微生物(区系、生物量、生理群)的影响.结果表明,水丝蚓组稻田土壤细菌、放线菌、真菌数量均高于对照组,分别达到极显著、显著、极显著.水丝蚓组稻田土壤微生物生物量碳(BC)和生物量氮(BN)高于对照组,均达到极显著差异水平.水丝蚓促进了稻田土壤硫化细菌、硝化细菌、纤维素分解菌、氨化细菌和固氮菌的增殖,抑制了反硫化细菌和反硝化细菌的生长和活性,有利于增加土壤硫、氮、磷等生源要素的有效性,提高稻田土壤养分的利用效率.利用底栖动物的生物扰动效应,根据农业系统中不同营养级生物的生态特性,可开发多级物质循环、多层次利用、多物种共生的现代农业技术,为可持续农业提供支持. 相似文献
28.
29.
30.
泥鳅扰动对水田沉积物颗粒垂直分布的影响 总被引:5,自引:2,他引:3
[目的]探索水田养殖泥鳅于其沉积物颗粒分布的作用。[方法]以化学性质稳定的玻璃珠作为示踪颗粒,研究泥鳅扰动对水田沉积物颗粒垂直分布的影响,探讨底栖鱼类在水层一底栖界面耦合过程中的生物扰动作用。[结果]泥鳅扰动10d后,沉积物表层示踪颗粒有43.2%向下迁移,最大迁移深度为7.5cm,垂直迁移率为7.676×10^-4g^-1·cm^-2·d^-1。6cm深处的示踪颗粒中,分别有39.7%和9.9%在扰动后向上和向下迁移,向上和向下最大迁移距离分别为4.5cm和5.1cm,垂直向上和向下迁移率分别为7.597×10^-4g^-1·cm^-2·d^-1和1.894×10^-4g^-1·cm^-2·d^-1。[结论]泥鳅扰动能影响水田沉积物颗粒的垂直分布,促进水/土界面的营养物质循环与转化。 相似文献