Effects of nitrogen addition on stoichiometric ratio and soil characteristics of Leymus chinensis in Horqin artificial grassland
[Objective]To investigate the stoichiometric characteristics of Leymus chinensis in Horqin and the re-sponse of soil enzyme activity and soil chemical properties to nitrogen addition.[Method]The stoichiometric charac-teristics and soil characteristics of L. chinensis artificially planted in Horqin Sandy land were studied under different ni-trogen application levels,0 kg/hm²,50 kg/hm²,100 kg/hm²,150 kg/hm² and 200 kg/hm²,respectively.[Result]With the increase of nitrogen application,the contents of organic carbon and total nitrogen increased,while the con-tents of total phosphorus decreased.The addition of nitrogen fertilizer effectively increased the content of organic car-bon and total nitrogen in soil,reduced the soil conductivity and pH.The activities of urease,phosphatase and catalase in soil were improved with the highest soil enzyme activity achieved at 150 kg/hm² nitrogen application level,which were 17.78 mg/g,60.21 mg/g and 0.62 mg/g,respectively.[Conclusion]The application of nitrogen fertilizer can improve the enzyme activities in the soil,thus promotes the transformation of nutrient elements in the soil,and is con-ducive to the absorption and utilization of nutrients and elements in the soil of L. chinensis. Comprehensive analysis suggested that the recommended nitrogen application amount of L. chinensis grassland in Horqin Sandy Land is 200 kg/hm².
nitrogen fertilizerleymus chinensissoil enzyme activitystoichiometric characteristicsphysical and chemical properties of soil
万方数据
维普
