澎溪河消落带不同植物类型下土壤无机氮及相关微生物特征

发布时间：2018-02-27 14:27

本文关键词： 消落带植物类型氮素形态氮素转化菌氮素转化强度　出处：《环境工程学报》2017年02期 　论文类型：期刊论文

【摘要】：消落带土壤氮素循环因植被群落演替和季节性淹水会影响整个库区水环境安全。选择三峡库区一级支流澎溪河消落带为研究区域,分别在潮土、紫色土和水稻土分布区采集3种自然草本(狗牙根、香附子、苍耳)和1种农作物(玉米)覆盖区土壤,分析了土壤无机氮形态以及氨化、硝化、亚硝化、反硝化功能菌数量和生化作用强度,并分析了氮转化菌数量、生化作用强度以及土壤理化特征之间的关系。研究结果表明:不同植物覆盖对消落带土壤无机氮和氮素生理群微生物及其功能影响显著;狗牙根和香附子覆盖土壤硝化、亚硝化微生物数量与作用强度高于苍耳和玉米,进而土壤硝态氮和亚硝态氮含量表现相同规律;狗牙根与香附子覆盖区土壤反硝化细菌数量与作用强度高于苍耳和玉米,有利于消落带对氮素的拦截转化;消落带植被覆盖度、土壤有机质、pH、无机氮形态与土壤微生物数量和功能相关性较强。狗牙根、香附子覆盖区土壤有机氮氨化过程弱于苍耳和玉米,而亚硝化、硝化、反硝化过程强于苍耳和玉米,有利于有机态氮的保持和铵态氮迅速转化,为消落带植被恢复和重建提供参考。
[Abstract]:The WLFZ soil nitrogen cycle for vegetation community succession and seasonal flooding will affect the security of water environment in the Three Gorges Reservoir area. A tributary of the littoral zone of Pengxi River as the study area, respectively in the fluvo aquic soil, purple soil and paddy soil distribution area collected 3 natural herbs (bermudagrass, Cyperus, Xanthium) and 1 kinds of crops (maize) soil, analyzes the soil inorganic nitrogen and ammonification, nitrification, nitrification, denitrification bacteria quantity and biochemical intensity, and analyzed the quantity of nitrogen transformation bacteria, the relationship between physicochemical characteristics and soil biochemical intensity. The results showed that different plant cover significantly the fluctuating effects of soil inorganic nitrogen and nitrogen physiological groups of microorganisms and their function; bermudagrass and Cyperus mulching on soil nitrification, nitrification microbial quantity and effect of strength is higher than that of Xanthium and corn, and the soil nitrate nitrogen and nitrite The nitrogen content showed the same regularity; bermudagrass and Cyperus rotundus soil denitrifying bacteria and the effect of strength is higher than that of Xanthium and corn, to take on the interception of nitrogen transformation of riparian vegetation coverage; with the soil organic matter, pH, correlation between inorganic nitrogen and soil microbial quantity and strong function. Cynodondactylon Cyperus, covering soil organic nitrogen ammonification process weak in cocklebur and corn, and nitrification, nitrification, denitrification process in cocklebur and corn, is conducive to maintaining the organic nitrogen and ammonium nitrogen in the rapid transformation, to provide reference for riparian zone vegetation restoration and reconstruction.

【作者单位】：煤矿灾害动力学与控制国家重点实验室;三峡库区生态环境教育部重点实验室;重庆大学资源及环境科学学院;西南大学资源环境学院;
【基金】：国家水体污染控制与治理科技重大专项(2013ZX07104-004-05)
【分类号】：S153.6;S154.3

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