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砒砂岩与沙复配土水氮利用效率定量评估

发表时间:2016-08-15  浏览量:1452  下载量:457
全部作者: 王欢元,韩霁昌,程 杰,童 伟,张海欧
作者单位: 陕西省土地工程建设集团有限责任公司;陕西省土地整治工程技术研究中心;国土资源部退化及未利用土地整治工程重点实验室
摘 要: 定量化不同比例砒砂岩与沙复配土的水、氮利用效率,为制定优化的水肥管理措施提供理论指导。本研究在榆林市大纪汗村进行。设置3种混合比例(砒砂岩:沙为1:1、1:2和1:5)的砒砂岩与沙复配土,通过田间试验与模型模拟的方法进行了研究。首先,应用田间系统的观测数据对水氮管理模型(water and nitrogen management model,WNMM)进行校验,然后应用模型计算得到了不同复配比例下的作物产量、农田水分渗漏、氮素淋失、气体损失和水氮利用效率等。结果表明:对砒砂岩:沙为1:1、1:2和1:5的3种复配土而言,随着复配土中砒砂岩含量的降低,蒸散量变化不大,渗漏量则明显增加,水分利用效率最高可达1.30 kg•m-3. 氨挥发和氮淋失是氮素的主要损失途径,作物吸收是氮素的主要源汇项。氮素利用效率和肥料利用效率最高可分别达到33.13,24.93 kg•kg-1•N-1. 砒砂岩在提高沙地水分、氮素和肥料利用效率方面发挥了显著的作用。
关 键 词: 土壤学;毛乌素沙地;砒砂岩;水氮管理模型;水分渗漏;氮素淋失
Title: Analysis of water and nitrogen use efficiency for different ratio of soft rock and sand compound soil
Author: WANG Huanyuan, HAN Jichang, CHENG Jie, TONG Wei, ZHANG Haiou
Organization: Shaanxi Provincial Land Engineering Construction Group Co. Ltd.; Shaanxi Province Land Reclamation Engineering Technology Research Center; Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of China
Abstract: The objective of this study was to quantify water and nitrogen use efficiencies (WUE and NUE) for different ratio of soft rock and sand compound soil, and to provide some suggestions on optimizing water and nitrogen management practice. In this study, three ratios of soft rock and sand compound soil were conducted in Dajihan county, Yulin city. After a water and nitrogen management model (WNMM) was calibrated and validated, the yields, amounts of drainage, N leaching, WUE and NUE for different ratios of soft rock and sand compound soil were all calculated. The results showed that, for 1:1, 1:2 and 1:5 compound soil, with decreasing soft rock content in compound soil, the evapotranspiration change was not significant, and water drainage was clearly increased. WUE could be up to 1.30 kg•m-3. N leaching and ammonia volatilization were the main pathways of nitrogen loss, and crop uptake was the main sink of N. NUE and fertilizer use efficiency could reach to 33.13, 24.93 kg•kg-1•N-1, respectively. Soft rock played an important role in improving WUE, NUE and fertilizer use efficiency.
Key words: soil science; Mu Us sandland; soft rock; water and nitrogen management model; drainage; nitrogen leaching
发表期数: 2016年8月第15期
引用格式: 王欢元,韩霁昌,程 杰,等. 砒砂岩与沙复配土水氮利用效率定量评估[J]. 中国科技论文在线精品论文,2016,9(15):1541-1552.
 
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