水氮调控对设施土壤有机氮组分、全氮和矿质氮的影响

发布时间：2018-06-03 02:36

本文选题：水氮调控 + 设施土壤　；参考：《水土保持学报》2017年06期

【摘要】：为探讨水氮调控对设施土壤有机氮组分、全氮和矿质氮的影响,通过膜下滴灌设施番茄田间定位试验,采用灌水下限(W_1、W_2、W_3)和施氮量(N_1、N_2、N_3)的两因素三水平随机区组设计,研究水氮调控对休耕期0—30cm土层土壤有机氮组分、全氮和矿质氮的影响。结果表明,不同水氮调控下,设施土壤有机氮主要是以酸解态氮为主,总体表现酸解态氮大于非酸解态氮含量。土壤有机氮组分在酸解态氮和非酸解态氮中分配比例差异明显。土壤有机氮各组分含量及占全氮比例的大小顺序为氨基酸氮/氨态氮未知氮氨基糖氮。除氨基糖氮,其余酸解态氮各组分和酸解总氮含量及其占全氮比例均随着土层深度的增加而降低,不同土层含量差异显著(P0.05)。土壤全氮、矿质氮和总有机氮含量随土层深度的增加也呈降低趋势,且含量差异达到极显著水平(P0.01)。除氨基糖氮,全氮与其他有机氮各组分、酸解总氮间均达到极显著正相关(P0.01);矿质氮仅与酸解氨态氮及酸解总氮的影响达到极显著(P0.01)和显著正相关(P0.05)。灌水下限、施氮量及水氮交互对设施土壤全氮、矿质氮和总有机氮及有机氮组分影响均达到极显著水平(P0.01)。因此,设施土壤氮素含量的变化与水氮管理模式紧密相关。氨态氮和氨基酸氮是设施土壤中最主要的有机氮形态,是土壤活性氮中的主要组分,亦是土壤供氮潜力的表征。考虑土壤供氮潜力,灌水下限35kPa、施氮量300kg/hm~2为该设施生产下最优的水氮管理措施。
[Abstract]:In order to study the effects of water and nitrogen regulation on organic nitrogen, total nitrogen and mineral nitrogen in protected soil, a two-factor three-level random block design was designed by using two-factor three-level random zone design of Tomato under drip Irrigation (drip Irrigation under Film). The lower limit of irrigation was W _ 1 / W _ 2T _ 2T _ 2 / W _ 3) and N _ 1 / S _ 1N _ 2N _ 2N _ 3). The effects of water and nitrogen regulation on soil organic nitrogen, total nitrogen and mineral nitrogen in 0-30cm soil layer during fallow period were studied. The results showed that under the control of different water and nitrogen, the main organic nitrogen in protected soil was acidolysis nitrogen, and the total content of acidolysis nitrogen was higher than that of non-acidolysis nitrogen. The distribution ratio of soil organic nitrogen in acidolytic nitrogen and non-acidolysis nitrogen was significantly different. The order of soil organic nitrogen content and the proportion of total nitrogen is amino acid nitrogen / ammonia nitrogen unknown nitrogen aminoglycan nitrogen. With the exception of amino sugar nitrogen, the other components of acidolysis nitrogen, the content of total acid nitrogen and the proportion of total nitrogen to total nitrogen decreased with the increase of soil depth, and there were significant differences between different soil layers (P 0.05). The contents of total nitrogen, mineral nitrogen and total organic nitrogen also decreased with the increase of soil depth, and the difference reached a very significant level (P 0.01). Except amino sugar nitrogen, total nitrogen and other organic nitrogen components, total nitrogen of acidolysis had very significant positive correlation (P 0.01), mineral nitrogen only had significant effect on ammonia state nitrogen and total nitrogen of acid hydrolysis (P 0.01) and significant positive correlation between mineral nitrogen and ammonia state nitrogen and total nitrogen of acid hydrolysis (P 0.05). The effects of the lower limit of irrigation, the amount of nitrogen application and the interaction of water and nitrogen on the total nitrogen, mineral nitrogen, total organic nitrogen and organic nitrogen components all reached the extremely significant level (P 0.01). Therefore, the change of soil nitrogen content is closely related to water and nitrogen management model. Ammonia nitrogen and amino acid nitrogen are the most important organic nitrogen forms in the protected soil, are the main components of soil active nitrogen, and also represent the potential of soil nitrogen supply. Considering the potential of soil nitrogen supply, the lower limit of irrigation was 35kPA and the amount of nitrogen application 300kg/hm~2 was the best water and nitrogen management measure under the production of the facility.
【作者单位】：沈阳农业大学土地与环境学院/农业部东北耕地保育重点实验室;
【基金】：国家自然科学基金项目(41401322) 国家科技支撑计划项目(2015BAD23B01) 农业部东北耕地保育重点实验室开放基金项目(2015NYBKFT-01)
【分类号】：S153.6

【相似文献】