氮添加对黄河三角洲高潮滩芦苇生长和土壤理化性质的短期效应

氮富集会影响到全球生态系统的植物生长繁殖和土壤理化性质.然而,目前关于氮富集对潮汐湿地生态系统植物生长和土壤理化性质的影响研究相对较少.通过氮添加野外控制实验,研究了4个氮添加水平(CK:0 g·m-2·a-1、N1:5 g·m-2·a-1、N2:20 g·m-2·a-1、N3:50 g·m-2·a-1)对黄河三角洲高...

The short-term effects of nitrogen addition on the growth of Phragmites australis and soil physical and chemical properties in a high marsh of the Yellow River Delta

Nitrogen enrichment can affect plant growth and reproduction and soil nutrient cycling in ecosystems around the world.However,there are few studies on the effects of nitrogen enrichment on plant growth and soil physical and chemical properties in tidal wetland ecosystem.In this study,the short-term effects of four nitrogen addition levels(CK:0 g·m^-2·a^-1,N1:5 g·m^-2·a^-1,N2:20 g·m^-2·a^-1,N3:50 g·m^-2·a^-1)on Phragmites australis growth and soil physical and chemical properties in the P.australis high marsh of the Yellow River Delta were studied through the field manipulative experiment of nitrogen addition.The experiment results showed that N1 addition level significantly increased P.australis height,internode length and leaf width,but decreased spike length.N2 addition level significantly increased P.australis height,internode length,leaf length,leaf width,but decreased leaf number.N3 addition level had no significant effect on the growth and reproduction of P.australis.However,the effects of nitrogen addition on P.australis density,leaf TC,TN and C:N were not significant.Except that N3 level increased the content of NO3—N(0-10)cm,other soil physical and chemical properties were not affected by nitrogen addition.Therefore,appropriate nitrogen addition can enhance the growth of P.australis in the short term,but overload of nitrogen had no effect on the its growth.The nature reserve should control the overloading of nitrogen flowing into the high marsh P.australis vegetation.