生态模型在农田蒸散及土壤水分模拟中的适用性评价  被引量:2

Evaluating the applicability of ecological model for simulating evapotranspiration and soil water content in winter wheat farmland

在线阅读下载全文

作  者:张雪松[1] 刘雅各 胡正华[1,3] 柳艺博[1] 张富存[1] 韩小梅[1] 

机构地区:[1]南京信息工程大学气象灾害教育部重点实验室/江苏省农业气象重点实验室,南京210044 [2]中国科学院沈阳应用生态研究所森林生态与管理重点实验室,沈阳110016 [3]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044

出  处:《生态学杂志》2017年第1期267-276,共10页Chinese Journal of Ecology

基  金:公益性行业(气象)科研专项(GYHY201506001);公益性行业(气象)科研专项(GYHY201306046);气象灾害教育部重点实验室(南京信息工程大学)开放课题(KLME1415);江苏省农业气象重点实验室项目(KYQ1404)资助

摘  要:为评价生态模型在农田蒸散及土壤水分运动模拟中的适用性,利用2013—2015年南京农业气象测站观测数据,评估了BEPS(Boreal Ecosystem Productivity Simulator)模拟冬小麦农田生态系统逐日蒸散及与土壤水分动态的可靠性,并进一步开展了植被冠层蒸腾和农田土壤蒸发分离。模拟结果表明:BEPS适用于研究冬小麦农田蒸散量及土壤水分运动规律;由于考虑了叶片聚集指数和冬小麦根系垂直分布递减系数随生育期变动的参数化改进,BEPS分别可以解释2013—2014年和2014—2015年两个生长季农田生态系统蒸渗仪实测蒸散量变化的83%和74%,参数化改进前后模型效率ME相当(前:0.8,后0.74),标准差RMSE(前:1.50,后1.05),平均偏差MBE(前:0.5,后0.35),误差减小;两个生长季中,土壤蒸发占冠层上方总蒸散的比例随生育进程而变化,全生育期发散比平均值分别为34%和29%;BEPS模拟的0~40 cm土层深度土壤水分随时间变化趋势与实测值基本一致,可以解释78%以上的土壤水分实测值变化,并能快速地响应降水变化。本研究表明,生态模型可以用于模拟冬小麦农田蒸散和土壤水分变化,并有助于厘定农田冠层中难以区分的植被蒸腾和土壤蒸发的比例关系,可为进一步开展气候变化背景下的区域蒸散发评估及与之相联系的农田节水管理奠定基础。To assess the applicability of ecological model for simulating evapotranspiration and soil water content in farmland,BEPS( Boreal Ecosystem Productivity Simulator),a processbased ecological model,was employed to simulate daily evapotranspiration( ET) and soil water dynamics of winter wheat farmland in growing seasons of 2013-2015,then the simulated results were compared against the field experimental data at agro-meteorological station in Nanjing,China. Furthermore,separation of soil evaporation and plant transpiration were conducted. Results showed that the R2 values between the simulated and measured values reached 0.83 during 2013-2014 and 0.74 during 2014- 2015. When the diurnal variation of leaf clumping index and root vertical distribution during the growth stage of the winter wheat was adopted in BEPS,BEPS per-formed better after modification,with the model efficiency( ME) value increasing from 0. 74 to0.8,the root mean square error( RMSE) value decreasing from 1. 50 mm to 1.05 mm,and the mean bias error( MBE) value decreasing from 0.50 mm to 0.35 mm,respectively. The ratio of soil evaporation to ET changed with growth progress during the growing stage,and the growing season-averaged ratios of soil evaporation to ET were 34% and 29% for the two growth seasons,respectively. The BEPS model explained 78% variations of soil moisture in the depth of 0- 40 cm,and responded quickly to the change of precipitation. Our study indicates that the improved ecological model can be used to simulate the changes of ET and soil water content in winter wheat farmland,and estimate the ratio between transpiration and evaporation that are difficult to distinguish in crop canopy. Our results will provide a basis for evaluating regional ET and agricultural water-saving management under climate change in the future.

关 键 词:生态模型 BEPS 根系垂直分布 农田蒸散 土壤水分 冬小麦 

分 类 号:S512.11[农业科学—作物学]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象