Development of integrated hydro-biogeochemical model in a forest catchment

森林流域综合水文生物地球化学模型的开发

• 批准号: 08660186
• 负责人: OHTE Nobuhito
• 金额: $ 1.47万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08660186/
• 关键词: temperate forest catchment; hydrological processes; biogeochemistry; soi CO_2 gas; decomposition; forest ecosystem

An integrated hydrochemical model for description and forecast of biogeochemical responses in a forest catchment has been developed based on intensive observation in a temperate forest catchment. As the prototype of the basin-scale hydrochemical modeling taking the saturated-unsaturated infiltrated into the soil chemical process, a numerical model for SiO_2 concentration generation was proposed. The process oriented 1-D pH simulation model and nitrogen/carbon dynamics model were also proposed. The basin-scale model has multiple subunits with each soil depth that is determined by actual soil depth distribution. A coupling calculation of saturated-unsaturated infiltration and convection-diffusion process is conducted for each subunit using observed rainfall quantity and quality data set. Using the properly estimated chemical weathering rate, the model can reproduce the observed timesequential change of the SiO_2 concentration of stream and subsurface groundwater for the duration of both storm event and base flow periods. The 1-D pH simulation model is based on the observed information of buffering systems in actual soil layr. The model simulates the CO_2 gas profile and alkalinity of soil solution. It can successfully reproduce the seasonal changes in pH of groundwater and streamwater.

基于对温带森林流域的密集观测，开发了一个用于描述和预测森林流域生物地球化学响应的综合水化学模型。作为以饱和-非饱和渗入土壤化学过程为基础的流域尺度水化学模型的原型，提出了SiO_2浓度生成的数值模型。还提出了面向过程的一维pH模拟模型和氮/碳动力学模型。盆地尺度模型具有多个子单元，每个子单元的土深由实际土深分布确定。利用观测的降雨量和质量数据集对每个子单元进行饱和-非饱和入渗和对流-扩散过程的耦合计算。使用正确估计的化学风化率，该模型可以重现在风暴事件和基流期间观察到的溪流和地下地下水 SiO_2 浓度的时间序列变化。一维 pH 模拟模型基于实际土层缓冲系统的观测信息。该模型模拟了CO_2气体剖面和土壤溶液的碱度。它可以成功地再现地下水和河水pH值的季节变化。

项目成果

Ohte, N.and Asano, Y.et al.: "Subsurface Hydrolorical Responses to Land Use Changes" Kluwer Academic Publishers, 226 (1997)

Ohte, N. 和 Asano, Y. 等人：“土地利用变化的地下水文响应”Kluwer 学术出版社，226 (1997)

Ohte, N.et al.: "An insitu lysimeter experiment on soil moisture influence for inorganic nitrogen discharge from forest soil" Journal of Hydrology. 195. 78-98 (1997)

Ohte, N.et al.：“土壤湿度影响森林土壤无机氮排放的原位蒸渗仪实验”水文学杂志。

武田 博清: "森林生態系における物質循環のしくみ" 化学と生物. 35. 26-31 (1997)

Hirokiyo Takeda：“森林生态系统物质循环的机制”化学与生物学 35. 26-31 (1997)。

武田博清: "森林生態系における物質循環のしくみ" 化学と生物. 35. 26-31 (1997)

Hirokiyo Takeda：“森林生态系统物质循环的机制”化学与生物学 35. 26-31 (1997)。

Ohte, N., Tokuchi, N.and Suzuki, M.: "An in situ lysimeter experiment on soil moisture influence for inorganic nitrogen discharge from forest soil" Journal of Hydrology. No.195. 78-98 (1997)

Ohte, N.、Tokuchi, N. 和 Suzuki, M.：“土壤湿度对森林土壤无机氮排放影响的原位蒸渗仪实验”水文学杂志。