模拟氮沉降对合肥市果岭草生物量及土壤养分的影响

唐文莉; 韩小霞; 姚雪晗; 刘肖利

文章摘要

唐文莉,韩小霞,姚雪晗,刘肖利.模拟氮沉降对合肥市果岭草生物量及土壤养分的影响[J].安徽建筑大学学报,2025,33(5):78-83

模拟氮沉降对合肥市果岭草生物量及土壤养分的影响

The Impact of Simulated Nitrogen Deposition on the Biomass and Soil Nutrients of Cynodon Dactylon in HefeiCity

DOI：

中文关键词: 氮沉降果岭草土壤pH值土壤有效氮含量根冠比

英文关键词: nitrogen deposition green grass soil pH value soil available nitrogen content toot crown ratio

基金项目:安徽省教育厅自然科学重点研究项目（KJ2021A1226）

作者	单位
唐文莉	Urban Construction College，Anhui Vocational College of City Management，Hefei 230011，China；College of Art and Design，Hefei University of Economics，Hefei 230011，China
韩小霞	Logistics Management Office of Anhui Jianzhu University，Hefei 230601，China
姚雪晗	College of Art and Design，Hefei University of Economics，Hefei 230011，China
刘肖利	College of Art and Design，Hefei University of Economics，Hefei 230011，China

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中文摘要:

人为活动影响导致氮沉降加剧，对草地生态系统初级生产力产生直接影响。以安徽省合肥市绿地系统的果岭草（Cynodon dactylon）为研究对象，在铺设的果岭草草坪中选取样方模拟短期氮沉降，设置 4 个处理：N0、低氮N1、中氮 N2和高氮 N3的氮素（NH4NO3），对草坪样地喷施，测定株高、土壤 pH值、土壤氮元素含量并计算根冠比，发现不同处理的果岭草株高表现为：N2>N1>N3>N0；0 ~ 5 m处中氮和高氮 pH值下降明显，呈明显的酸化现象；根冠比随着施氮量的增加呈减小趋势；氮沉降直接增加草地土壤有效氮含量，随着施氮浓度的增加而增加。中氮水平的氮沉降处理有利于果岭草植株生长以及生物量积累，对亚热带地区果岭草生产力的提高具有促进作用。

英文摘要:

In recent years, nitrogen deposition has been increasingly exacerbated by human activities, directly affecting the primary productivity of grassland ecosystems. This study taked Cynodon dactylon in the green space system of Hefei City, Anhui Province as the research object. Samples were selected from the laid Cynodon dactylon lawn for short-term nitrogen deposition simulation experiments. Four treatments were set up: N0、Spraying low nitrogen N1, medium nitrogen N2, and high nitrogen N3（NH4NO3) on lawn plots, measuring plant height, soil pH, soil nitrogen content, and calculating root shoot ratio. The research results indicate that the plant height of green grass treated differently is as follows: N2>N1>N3>N0；The pH values of medium and high nitrogen at 0 ~ 5cm decrease significantly, showing a noticeable acidification phenomenon; The root shoot ratio shows a decreasing trend with the increase of nitrogen application rate; Nitrogen deposition directly increases the available nitrogen content in grassland soil, which increases with the increase of nitrogen application concentration. The nitrogen deposition treatment at medium nitrogen levels is beneficial for the growth and biomass accumulation of green grass plants. Therefore, nitrogen deposition at medium nitrogen levels has a promoting effect on the productivity of green grass in subtropical regions.

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