基于VPM与MOD17产品的中国农田生态系统总初级生产力估算比较

VPM(vegetation photosynthesis model)与PSN(photosynthesis)模型是2个基于MODIS数据估算生态系统总初级生产力(gross primary productivity,GPP)的光能利用率模型,该文对比了VPM和PSN模型在中国农田生态系统估算中的结果并对其差异形成的原因进行了分析。研究表明:1)在位于冬小麦-夏玉米二熟区的中国科学院禹城综合试验站以及种植春玉米的盈科灌区绿洲站,与碳通量观测数据相比,VPM模拟结果分别高估3.82%、12.08%,基于PSN模型利用MODIS数据计算的MOD17产品则分别低估53.35%、63.03%;2)在...

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Published in农业工程学报 Vol. 32; no. 4; pp. 191 - 198
Main Author 牛忠恩 闫慧敏 陈静清 黄玫 王绍强
Format Journal Article
LanguageChinese
Published 中国科学院大学资源与环境学院,北京 100049%中国科学院地理科学与资源研究所,北京,100101 2016
中国科学院地理科学与资源研究所,北京 100101
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2016.04.027

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Summary:VPM(vegetation photosynthesis model)与PSN(photosynthesis)模型是2个基于MODIS数据估算生态系统总初级生产力(gross primary productivity,GPP)的光能利用率模型,该文对比了VPM和PSN模型在中国农田生态系统估算中的结果并对其差异形成的原因进行了分析。研究表明:1)在位于冬小麦-夏玉米二熟区的中国科学院禹城综合试验站以及种植春玉米的盈科灌区绿洲站,与碳通量观测数据相比,VPM模拟结果分别高估3.82%、12.08%,基于PSN模型利用MODIS数据计算的MOD17产品则分别低估53.35%、63.03%;2)在中国农田生态系统,MOD17产品普遍低于VPM模拟结果,在西北、东北及黄淮海等地区约低于50%以上,在南方地区低于不到30%;3)在中国北方旱作区,MOD17产品与VPM模拟结果呈强相关关系,相关系数为0.85,模型中的最大光能利用率参数是导致MOD17产品在北方旱作种植区低于VPM模拟结果的主要原因。
Bibliography:11-2047/S
Niu Zhong'en, Yan Huimin Chen Jingqing, Huang Mei, Wang Shaoqiang ( l. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 1 O0101, China; 2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China)
Gross primary productivity (GPP) of terrestrial ecosystem is an important variable in studies of climate change and carbon cycle. Accurate estimation of GPP is crucial to understand ecosystem response to climate variability and change. The eddy covariance (EC) technique provides the best approach to measure net carbon dioxide (CO2) change at site scale, which can be employed in GPP calculation. However, the EC technique only provides integrated CO2 flux measurements over footprints with sizes and shapes that vary with the tower height, canopy physical characteristics and wind velocity. Satellite remote sensing has played an increasing role in the characterization of vegetation structure and the estimation of GP
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2016.04.027