摘要
为了控制氮肥量、节水、提升土壤地力,通过收集已发表结果的数据,采用元分析方法系统地探索了内蒙古河套灌区土壤硝态氮与氮淋失量状况及其相关因素.结果表明,常规管理下玉米(Zea mays L.)地、向日葵(Helianthus annuus L.)地、春小麦(Triticum aestivum L.)地土壤表层(0～20 cm)平均硝态氮含量分别为22.78、9.92、17.80 mg/kg,土壤平均氮淋失量分别为49.82、45.11、93.73 kg/(hm2·年),常规施氮(N)量分别为357.7、233.2、320.0 kg/hm2.常规施氮量导致的土壤氮淋失量是不施用氮肥的6.76倍,其主要影响因素为土壤质地、土壤表层有机质含量、土壤表层pH、作物类型、灌溉量.这表明河套灌区常规管理下的施氮量偏高,地力随时间有降低的趋势,氮淋失较严重.
Abstract
In order to controll nitrogen fertilizer amount,save water,and improve soil fertility,soil nitrate nitrogen and nitrogen leach-ing and their related factors were systematically explored using meta-analysis methods in terms of the data collected from the published results in the Hetao Irrigation District,Inner Mongolia.The results showed that the means of nitrate nitrogen at the 0～20 cm depth in the corn,sunflower,and spring wheat fields under conventional management were 22.78,9.92,and 17.80 mg/kg,the means of soil nitrogen leaching were 49.82,45.11,and 93.73 kg/(hm2·a),and the means of conventional nitrogen(N)application rate were 357.7,233.2,and 320.0 kg/hm2,respectively.The soil nitrogen leaching resulting from the conventional nitrogen application rate was 6.76 times that from the no nitrogen fertilizer application,and the main influencing factors were soil texture,soil surface organic mat-ter,soil surface pH,crop tape,and irrigation rate.These findings indicated that the nitrogen application rate under the conventional management in the Hetao Irrigation District was high,the soil fertility tended to decrease over time,and the nitrogen leaching was seri-ous.
基金项目
内蒙古自治区自然科学基金项目(2020MS04001)
内蒙古自治区科技计划项目()
内蒙古自治区科技厅项目()
维普
万方数据