基于藻类吸收系数的湖泊初级生产力遥感估算模型研究：以滇池和洱海为例

Remote estimation of primary production for inland lakes can not only determine the nutrition state of the lakes, but also be used in the study on biogeochemical process within the lake ecosystems, and their response to global changes. Lake Dianchi, a seriously polluted inland lake, and Lake Erhai, an inland lake with good water quality, are taken as study cases in this research. Numbers of filed investigations will be carried out, water samples will be collected and analyzed in laboratory, and the environmental characteristics of the study areas will also be studied. Based on the theory of bio-optical model, an algorithm can retrieve inherent optical properties both for turbid (i.e. Dianchi) and clear (i.e. Erhai) inland waters will be proposed. Then a semi-analytical model for estimating the diffuse attenuation coefficient of water bodies will be developed through the simulation experiments using the radiative transfer model Hydrolight. After that, the primary production model based on phytoplankton absorption coefficient, which has widely validated in oceanic waters, will be parameterized both for turbid and clear inland waters. Finally, the spatial distribution maps of primary production will be generated using satellite images. Apparently, these achievements can provide crucial data base for water quality monitoring, fishery management, and studies on biogeochemical process for the study areas.

湖泊初级生产力的遥感估算不仅可以用于确定其营养状态，而且有助于深刻理解和研究湖泊生态系统的生物地球化学循环过程、及其对全球变化的响应。本项目以污染较为严重的滇池和水质较为良好的洱海水体为研究案例，通过野外实地调查和实验室分析，研究水体的生物光学特性及其环境特征。从生物光学模型出发，发展可同时适用于高浊度(滇池)和较清澈(洱海)内陆湖泊水体的固有光学特性反演算法。通过辐射传输模型Hydrolight的模拟分析，建立水体漫散射消光系数的半分析估算模型。以基于藻类吸收系数的初级生产力模型为基础框架，通过模型参数优化来建立适用于不同浊度湖泊水体的初级生产力遥感估算模型。进而绘制初级生产力的空间分布图，以期为研究区的水质监测、渔业资源管理、以及生物地球化学研究提供相应的基础信息

湖泊初级生产力的遥感估算不仅可以用于确定其营养状态，而且有助于深刻理解和研究湖泊生态系统的生物地球化学循环过程、及其对全球变化的响应。本项目以不同水质状况的湖泊水体为研究案例，通过野外实地调查和实验室分析，研究水体的生物光学特性及其环境特征。从生物光学模型出发，发展了可同时适用于高浊度和较清澈内陆湖泊水体的固有光学特性反演算法。通过辐射传输模型Hydrolight的模拟分析，建立了水体漫散射消光系数和真光层深度的半分析估算模型。以基于藻类吸收系数的初级生产力模型为基础框架，通过模型参数优化来建立了适用于不同浊度湖泊水体的初级生产力遥感估算模型，进而绘制了湖泊初级生产力的空间分布图。这些研究成果可以为研究区的水质监测、渔业资源管理、以及生物地球化学研究提供相应的基础信息。