摘要
为了解新乡市牧野区冬春茬蔬菜拉秧后,即夏季敞棚休闲期,硝态氮在各土层中的残留、空间分布状况及淋失风险,试验以农田为对照,采集了不同种植年限(2年、3年、16年和21年)设施菜田土壤样品进行测定分析。结果表明,设施菜田各土层硝态氮含量和累积量均高于农田,且二者均随种植年限的增加而增大,与种植年限间有极显著的线性正相关。各种植年限设施菜田中,随土层加深,硝态氮含量及累积量呈先降后增的趋势。其中,表层较高,40~60 cm最低,至80~100 cm达最大。虽然种植年限对表层土壤硝态氮的富集作用大于下层土壤,但这种由肥料表施而造成的硝态氮富集现象,会因降雨或灌水,形成在下层土体的空间分布重构。综上,随种植年限增加,设施菜田硝态氮淋失风险加剧,应控制氮肥投入量和灌水量。
In order to know more about the residual amount,spatial distribution and leaching risk of nitrate nitrogen in different soil layers during the summer fallow period of greenhouse field,our experiment was carried out with farmland as the control,and with soils collected as samples of different treatments from vegetable fields with different planting years(2,3,16 and 21 years).The results showed that both of the soil nitrate nitrogen content and its accumulation in different soil layers were higher than that of the farmland,and both of them increased with the increase of the vegetable planting years.Moreover,there was a very significant linear positive correlation between soil nitrate nitrogen and the planting years.In the vegetable field,the nitrate nitrogen content and accumulation tended to decrease first and then increase with the deepening of soil layer,among which the surface layer was higher,the lowest one was 40-60 cm,and the highest one was 80-100 cm.Although the role of vegetable planting years played on the enrichment of nitrate nitrogen was bigger in the surface soil than in the subsoil,nitrate nitrogen in the upper soil layers would reconstruct and generate new spatial distribution due to the rainfall or irrigation.In conclusion,risks of nitrate leaching increased with the increasing planting years of greenhouse vegetable,which could be controlled by reduced N fertilization and irrigation.
作者
潘飞飞
宋俊杰
李庆飞
PAN Feifei;SONG Junjie;LI Qingfei(School of Horticulture and Landscape Architecture,Henan Institute of Science and Technology,Xinxiang 453003,Henan,China;Henan Province Engineering Research Center of Horticultural Plant Resource Utilization and Germplasm Enhancement,Xinxiang 453003,Henan,China)
出处
《中国瓜菜》
CAS
北大核心
2022年第1期70-75,共6页
China Cucurbits And Vegetables
基金
河南省重点研发与推广专项(202102110065)
河南科技学院自然科学基础研究计划项目(207010618002)。
关键词
设施菜田
种植年限
硝态氮
空间分布
Greenhouse soil
Planting years
Nitrate nitrogen
Spatial distribution
