摘要
准确估算烟田生态系统生产力,对于评估区域烟叶产量的时空变化特征及研究烟叶产量的影响因素至关重要。采用遥感数据和地面通量观测数据,对MODIS生产力模型在攀西烟区典型烟田生态系统总初级生产力(GPP)评估中的适用性进行初步验证和本地参数化,以提高MODIS数据产品在攀西烟田生产力水平评价中的可信度。结果表明:采用默认参数的GPP模拟值低于观测值,1:1直线回归斜率为0.769,决定系数(R^2)为0.776,效率系数(NS)为0.253,均方根误差(RMSE)为0.268g C·m^(-2)·8day^(-1),模型模拟效果相对较差。基于通量观测数据,对默认参数的MODIS生产力模型进行本地参数化后,GPP模拟效果明显改善,1:1直线斜率、R^2及NS分别为1.001、0.984和0.919,RMSE下降至0.0978 g C·m^(-2)·8day^(-1),时间动态曲线基本一致,表明参数校正后的MODIS生产力模型在研究区具有较好的适用性。为进一步利用该模型在攀西及西南烟区进行烟田生产力评估及水、碳循环过程研究提供理论依据与数据支持。
Accurate estimation of ecosystem productivity in tobacco field is important for assessing temporal and spatial variation characteristics of tobacco yield and influencing factors of tobacco leaves.Based on remote sensing data and ground flux observation data,the applicability of MODIS gross primary productivity model of typical tobacco fi eld ecosystem in Pan-xi tobacco area wa verifi ed and locally parameterized,so as to improve credibility of MODIS data products in productivity level evaluation.Results showed that GPP simulation value with default parameters was lower than observed value;1:1 linear regression slope was 0.769 with determination coeffi cient(R2)of 0.776,effi ciency coeffi cient(NS)of 0.253,root mean square error(RMSE)of 0.268 gC·m^-2·8 day^-1 The simulation eff ect of the model was relatively poor.Based on the fl ux observation data,the GPP simulation eff ect was improved after the MODIS productivity model was locally parameterized with default parameters.Compared with the observed values,the effi ciency coeffi cient was improved signifi cantly,the 1:1 linear regression slope,R^2 and NS were 1.001,0.984 and 0.919,respectively.The RMSE dropped to 0.0978 gC·m^-2·8 day^-1,and the time dynamic curve was consistent which validated the accuracy of the model.These results proved that the MODIS productivity model had effi cient applicability after parameterization,and it could provide applicable GPP datasets to assist future research in carbon and energy balance in Pan-xi tobacco planting area.
作者
徐同庆
徐宜民
张烨
王程栋
刘光亮
王树声
董建新
陶健
XU Tongqing;XU Yimin;ZHANG Ye;WANG Chengdong;LIU Guangliang;WANG Shusheng;DONG Jianxin;TAO Jian(Tobacco Research Institute,Chinese Academy of Agricultural Sciences,Qingdao 266101,Shandong,China;Graduate School,Chinese Academy of Agricultural Sciences,Beijing 100081,China;College of Public Administration,Shandong Technology and Business University,Yantai 264005,Shandong,China)
出处
《中国烟草学报》
EI
CAS
CSCD
北大核心
2018年第4期48-54,共7页
Acta Tabacaria Sinica
基金
国家自然科学基金青年科学基金项目(41501054)
中国农业科学院科技创新工程(ASTIP-TRIC03)
关键词
MODIS生产力模型
总初级生产力
通量观测
攀西烟区
MODIS productivity model
gross primary production
fl ux observation
Pan-xi tobacco planting area
