硝态氮通过褐土田间隔离土柱运移的模拟  

Simulation of NO_3-N Transport Through an Isolated Column of Cinnamon Soil

作　　者：崔剑波[1] 庄季屏[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,110015

出　　处：《中国农业大学学报》1997年第S1期57-64,共8页Journal of China Agricultural University

摘　　要：本文运用马尔可夫过程的理论,模拟了硝态氮在土壤非饱和流条件下通过褐土隔离土柱的运移特征。将时间可变系统假设为由紧密相连的时间均质情况相接而成,使得运用马尔可夫过程成为可能,并将随机过程与确定过程相结合,在给定土壤水流量及汇源项转移强度的土壤层次中,给出了硝态氮溶质的概率分布,在计算各土层间的转移概率时考虑了硝态氮的作物吸收、淋洗、硝化和反硝化等主要过程。在褐土农田土壤非饱和流条件下,用隔离土柱对该模型运行效果进行了验证,结果显示模拟计算值与实测值之间吻合性较好。A stochastic model using a Markov Process to simulate the transport of NO_3-N through the upper 1.2 m of an isolated in-situ cinnamon soil under unsaturated water flow was presented.The model converted the temporally variable system into one that closely resembles the time-homogeneous case making the application of Markov Process model possible.Probability distributions of nitrate were given for each soil layer given the flux of soil water and the intensity of transition for the source and sink terms.The main processes of nitrate uptake by plants,leaching of nitrate,nitrification and denitrification were con- sidered in calculating the transition probability from one soil layer to another.The model modifying the relationship of nitrogen transformation with correlative function,mean- while,verification plot experiment of the nitrate transport was conducted under the unsat- urated cinnamon soil field conditions,notes that,generally,there is satisfactory agree- ment between measured and simulated results.

关 键 词：田间条件 土壤非饱和流 隔离土柱 硝态氮 溶质运移 

分 类 号：S153[农业科学—土壤学]