摘要
为了明确不同土壤温度对土壤中水氮分布的影响以及选择合理的灌施方式,通过室内模型试验,研究了在蓄水单坑肥灌条件下不同土壤温度(20,25,30℃)所对应单坑灌水量(7L)和灌后不同时间(灌后1,5,10,15d)对土壤水氮运移的影响。研究结果表明:在径向距离r=25cm处,土壤温度分别为20,25,30℃,含水率空间分布基本一致,变化幅度不大;土壤温度为20,25℃时,土壤铵态氮含量随分布时间的延长先增大后减小,20℃时第10d土壤铵态氮含量达到最大值,25℃时第5d土壤铵态氮含量达到最大值,土壤温度为30℃时,随着时间的延长,土壤铵态氮含量逐渐减小;在同一分布时刻,土壤硝态氮含量随土壤温度的升高而增大。
In order to clarify the effect of different soil temperature after irrigation on transport of water and nitrogen,as well choose a reasonable way of irrigation methods,by means of indoor model test,under the condition of different soil temperature（20,25,30℃）,the impacts of a single water storage pit irrigation（7L）and different time after irrigation（1,5,10,15 dafter irrigation）on the migration of water and nitrogen are studied.The results show that：in the radial r=5cm,soil temperature of 20,25,30℃,the moisture content of spatial distribution is the same and has a small range of variation;the content of soil ammonium nitrogen shows a trend of first increasing and then decreasing with the time extending when the soil temperature is 20,25℃;moreover,the content of soil ammonium nitrogen reaches a maximum under the soil temperature of 20℃ on the tenth day;while for the soil temperature of 25℃,the content of soil ammonium nitrogen reaches a maximum on the fifth day;and at the soil temperature of 30 ℃,the content of soil ammonium nitrogen shows a trend of decreasing with the extension of time;at the same distribution moment,the content of soil nitrate nitrogen increases with the increase of soil temperature under the soil temperature of 30 ℃.
出处
《节水灌溉》
北大核心
2015年第8期79-83,共5页
Water Saving Irrigation
基金
国家自然科学基金项目(50979065
51249002)
教育部博士点基金项目(20111402120006
20121402110009)
山西省青年科技研究基金资助项目(2012021026-2)
山西省科技攻关项目(20110311018-1
20140311016-6)
山西省高等学校创新人才支持计划资助
关键词
蓄水坑灌
水氮运移
硝态氮
铵态氮
土壤含水率
water storage pits irrigation
transport of water and nitrogen
nitrates
ammonia
soil moisture
