鄱阳湖湿地泗洲头洲滩浅层土壤氮素的时空特征

发布时间：2018-04-30 06:10

本文选题：土壤氮素 + 空间分异　；参考：《江西师范大学学报(自然科学版)》2017年02期

【摘要】：湿地是全球氮循环的N源、N汇和N转化器,自然湿地氮的研究对于揭示生态系统氮循环的规律具有重要意义.以鄱阳湖湿地泗洲头为研究区域,根据湿地海拔高程梯度(10~17 m)采取表层土壤0~20 cm土层样品,分析了土壤全氮、铵态氮、硝态氮、碱解氮的空间分布特征.结果表明:鄱阳湖湿地泗洲头表层土壤氮含量空间分布较为复杂,0~10 cm土层的氮含量和10~20 cm土层的氮含量呈现相似的梯度特征,0~10 cm土层的土壤氮含量要高于10~20 cm土层的土壤氮含量,其中0~10 cm土层和10~20 cm土层的全氮、铵态氮、碱解氮含量最高均值出现在高程13~14 m,硝态氮最高均值出现在高程16~17 m.利用SPSS双变量中的pearson相关性检验表层土壤全氮、铵态氮、硝态氮、碱解氮与地上生物量、土壤p H值、土壤含水量、年均淹水时间、高程之间的相关性,结果表明:土壤氮素与地上生物量的相关性在统计学意义上最为显著,而与其他环境因素的相关性并不明显.这反映了鄱阳湖泗洲头表层土壤氮含量的空间分布与积累过程受干扰的因素比较复杂.
[Abstract]:Wetland is the nitrogen sink and convertor of the global nitrogen cycle. The study of nitrogen in natural wetland is of great significance to reveal the rules of nitrogen cycling in ecosystem. The spatial distribution characteristics of soil total nitrogen, ammonium nitrogen, nitrate nitrogen and alkali-hydrolyzed nitrogen in surface soil layer of 0 ~ 20 cm soil layer were analyzed according to the elevation gradient of 10 ~ (17 m) in Sizhou head of Poyang Lake Wetland, and the spatial distribution characteristics of soil total nitrogen, ammonium nitrogen, nitrate nitrogen and alkali-hydrolyzed nitrogen were analyzed. The results showed that the spatial distribution of nitrogen content in the surface layer of Sizhou head of Poyang Lake Wetland was more complicated than that in 10 ~ 20 cm soil layer. The gradient characteristics of N content in 10 ~ 10 cm soil layer and 10 ~ 20 cm soil layer were similar. The N content of 10 ~ 10 cm soil layer was higher than that of 10 ~ 20 cm soil layer. Soil nitrogen content in the layer, The highest mean values of total nitrogen, ammonium nitrogen and alkali-hydrolyzed nitrogen in 0 ~ 10 cm soil layer and 10 ~ 20 cm soil layer were 13 ~ 14 m in height and 16 ~ 17 m in height. The correlation between surface soil total nitrogen, ammonium nitrogen, nitrate nitrogen, alkali-hydrolyzed nitrogen and aboveground biomass, soil pH value, soil water content, average annual flooding time and elevation were tested by pearson correlation in SPSS bivariate. The results showed that the correlation between soil nitrogen and aboveground biomass was statistically significant, but not with other environmental factors. This indicates that the spatial distribution and accumulation of nitrogen in the surface layer of Sizhou in Poyang Lake are complicated.
【作者单位】：江西科技师范大学旅游学院;江西师范大学地理与环境学院;江西科技师范大学生命学院;
【基金】：国家自然科学基金(31360120,41561105,71473113) 江西省自然科学基金(20132BAB203030) 江西省科技支撑计划(20151BBG70014) 江西省教育厅科技项目(GJJ150794) 江西省对外科技合作(20151BDH80022) 江西科技师范大学青年拔尖人才(2015QNBJRC008)联合资助项目
【分类号】：S153

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