干旱区生态环境知识资源中心(Arid): 根系吸水条件下固定沙丘水分动态数值模拟研究

Arid

	根系吸水条件下固定沙丘水分动态数值模拟研究
其他题名	Study on the Numerical Simulation of Moisture Behavior in Fixed Dune under Water Extraction by Plant Roots
	钱鞠 1; 龙训建 1; 马金珠 1; 张惠昌 1; 易立新 2
ISSN	1672-1683
出版年	2007
卷号	5 期号:5 页码:64-67
中文摘要	着重探讨了固定沙丘植物根系吸水问题.在甘肃省石羊河以东腾格里沙漠西南缘湖盆滩地邓马营湖北部-生长有白刺的固定沙丘上设置观测点,采用中子仪、负压计逐日定时分层测定沙丘0～175 cm深度含水量和水分势能.以野外实测数据为基础,运用数理统计方法确定非饱和导水率、水分扩散率等沙丘水分运动参数,并从宏观角度建立了与水面蒸发强度、沙丘水分含量相关的附加根系吸水项的白刺根系吸水模型.用所建数学模型对6月和8月白刺生长期内无雨时段沙丘水分动态进行模拟,并选取6月5日、10日、12日沙丘25 cm、55锄和100 cm深度模拟含水量值与实测值进行比较分析,两者之间的相对误差为-21.97%～5.67%,大多在-0.016%～3.56%之间.同时,比较了秋季预测与实测沙丘剖面水分分布曲线.沙丘水分动态模拟结果的验证与分析表明:根系吸水率精度较高,能较正确反映无雨时段根系吸水规律;用所建数学模型预测的白刺生长期沙丘剖面含水量与实测值分布曲线拟合较好.
英文摘要	Water uptake by roots in fixed dune was discussed in this paper.The field experiments had been daily carried out on time within the 0 cm～175 cm depth of the fixed dune planted Nitraria tangutorum which is located in the north of Dengmaying basin at the southwestern edge of Tengger desert in Shiyanghe river basin in the northwestern China’s Gansu province to measure moisture content and moisture potential with sand layers by Neutron moisture meter and Tensionmeter.Based on the measured data in the field,the parameters of dune moisture transport,such as unsaturated conductivity,moisture diffusivity etc.,were made using mathematical statistics method.Then model with the item of water uptake by Nitraria tangutorum roots which was related to the rate of evaporation measured by evaporator and dune moisture contents was established at the macroscopic angle.In addition,the numerical simulations of moisture behavior in fixed dune during the growth of Nitraria tangutorum and rainless period in June and August were conducted.The relative errors between simulated data and measured ones were-21.97%～5.67%,mainly-0.016%～3.56%,which was indicated in the numerical simulation of dune moisture at the depth of 25 cm,55 cm and 100 cm on June 5 th,10 th and 12 th.Meantime,the predicted curves of moisture distribution and the measured ones in the dune profile in autumn were compared.The results from the verification and analysis of dune moisture simulated data showed that the precision of root uptake rate was higher,and it was able to indicate the regularity of water uptake during the rainless period,the predicted moisture distribution curve in the dune profile during Nitraria tangutorum growth season by the use of mathematical model was basically consistent with the measured one.
中文关键词	固定沙丘 ; 根系吸水 ; 数值模拟 ; 水分预测
英文关键词	fixed dune water uptake by plant roots numerical simulation moisture prediction
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:2940975
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/221221
作者单位	1.兰州大学, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国; 2.南开大学环境科学与工程学院, 天津 300071, 中国
推荐引用方式 GB/T 7714	钱鞠,龙训建,马金珠,等. 根系吸水条件下固定沙丘水分动态数值模拟研究[J]. 兰州大学,2007,5(5):64-67.
APA	钱鞠,龙训建,马金珠,张惠昌,&易立新.(2007).根系吸水条件下固定沙丘水分动态数值模拟研究.,5(5),64-67.
MLA	钱鞠,et al."根系吸水条件下固定沙丘水分动态数值模拟研究".5.5(2007):64-67.