城郊乡级尺度菜地土壤氮素对蔬菜硝酸盐含量的影响

Effect of Nitrogen Level in Soil of Vegetable Fields on Nitrogen Content of Vegetables at Suburb's Township Level

为城郊乡级尺度高强度利用菜地的土壤氮素管理提供依据,通过野外采样调查研究与室内化学分析,研究其土壤的有机质、氮素含量特征及其对蔬菜品质的影响。结果表明:菜地土壤有机质、全氮水平丰富,均值分别为67.72和3.11 g/kg,且变异程度较大,平均变异系数分别为35.30%和29.81%。不同蔬菜品种硝酸盐含量差异显著,依次为叶类蔬菜>根茎类蔬菜>瓜果类蔬菜,平均含量为606.56 mg/kg。蔬菜硝酸盐含量与土壤全氮显著正相关,相关系数为0.295。城郊乡级尺度下菜地土壤养分含量变异程度大,应采取精细化的氮素管理措施,对不同地块实行差异化管理,实现蔬菜的高产与高效。

The content of soil organic matter and different nitrogen forms,and their effect on vegetable quality were investigated and determined by field sampling survey and indoor chemical analysis to provide the scientific basis for soil nitrogen management of vegetable fields at suburb＇s township level. The average organic matter and total nitrogen content in soil of vegetable field reaches 67. 72 and 3. 11 g / kg,and the average variance coefficient is 35. 30 % and 29. 81 %,respectively. The average nitrate content of vegetables is 606. 56 mg / kg,but there are significant differences in nitrate content between different vegetables,and the order of nitrate content in vegetables is foliage vegetable root and stem vegetable melon and fruit vegetable. There is a positive correlation between nitrate content in vegetables and total nitrogen content in soil,and the correlation coefficient is 0. 295. Because the variance in soil nutrition content of vegetable fields is great at suburb＇s township level,the differentiated management of different vegetable fields should be carried out by using fine nitrogen management measures to realize high yield and high efficiency of vegetables.