模拟氮沉降对荆条灌木“肥岛”土壤养分的影响

发布时间：2018-10-25 10:31

【摘要】：氮沉降的增加,可能会对土壤养分造成更为显著的影响,目前关于大气氮沉降对植物"肥岛"效应中土壤养分的影响鲜有报道。于河南省太行山南麓地区,以NH_4NO_3为供施氮源,按土层深度采集土样,以模拟氮沉降方法(3个水平,无氮CK、低氮2g N m~(-2)a~(-1)处理、中氮12g N m~(-2)a~(-1)处理和高氮24g N m~(-2)a~(-1)处理),分析了氮沉降对太行山荆条灌木(Vitex negundo L.var.)"肥岛"土壤中有机质、全氮和速效磷含量的影响。结果表明:灌木"肥岛"中全氮和速效磷含量,总体表现出随氮沉降量增长而增加的趋势;氮沉降显著增加了土壤表层有机质、氮、磷的含量;高氮沉降与CK相比引起的各土层间养分差异更显著;随着氮沉降水平的增加,冠幅内外和土层间养分差异增大,土壤养分的增长率随之加大;氮沉降在一定程度内加剧了"肥岛"的富集效应,且氮沉降量越大,这种富集效应越显著。这些研究结果可为研究灌木"肥岛"对外源氮的响应机制及保育作用提供参考。
[Abstract]:The increase of nitrogen deposition may have a more significant effect on soil nutrients. At present, there are few reports on the effects of atmospheric nitrogen deposition on soil nutrients in plant "fertilizer island" effect. In the south foot of Taihang Mountain, Henan Province, the soil samples were collected according to the depth of soil layer with NH_4NO_3 as the nitrogen source, and simulated nitrogen deposition (3 levels, 2 g N m ~ (-2) a ~ (-1) treatment with no nitrogen CK, low nitrogen content of 2g N m ~ (-2) a ~ (-1). Middle nitrogen 12g / m ~ (-2) a ~ (-1) and high nitrogen (24g / m ~ (-2) a ~ (-1), the effects of nitrogen deposition on (Vitex negundo L. Effects of organic matter, total nitrogen and available phosphorus in the soil of Fertilizer Island. The results showed that the contents of total nitrogen and available phosphorus in the shrub "Fertilizer Island" increased with the increase of nitrogen deposition, and nitrogen deposition significantly increased the contents of organic matter, nitrogen and phosphorus in the surface layer of the soil. With the increase of nitrogen deposition level, the nutrient difference between inside and outside of canopy and between soil layers increased, and the growth rate of soil nutrient increased. Nitrogen deposition intensifies the enrichment effect of "Fertilizer Island" to some extent, and the larger the nitrogen deposition is, the more significant the enrichment effect is. These results may provide a reference for the study of the response mechanism and conservation effect of the shrub "Fertilizer Island" to exogenous nitrogen.
【作者单位】：河南农业大学林学院;
【基金】：国家自然科学基金项目(31270750)
【分类号】：S714.8

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