Estimation of the above ground plant biomass on the paddy levees environment using the Hyper-spatial Image data

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  • 高空間分解能画像データによる畦畔等の植生バイオマス量の推定
  • コウクウカン ブンカイノウ ガゾウ データ ニ ヨル ケイ ハン トウ ノ ショクセイ バイオマスリョウ ノ スイテイ

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Abstract

The utilization of biomass derived from plant materials is effective for the measures of global warming such as the reduction of aerial CO2, but there is few data about dispersed areas such as the paddy levees environment, which has the large amount of the above ground plant biomass resources. The Hyper-spatial image data of the 20 cm in the ground resolution by airplane survey in the region of Hidaka-Town, Hyogo Prefecture with a total area of 910 ha was used for the estimation of the above ground plant biomass in the paddy levees and the roadside slope vegetation that has never been fully explored. A field survey was conducted during late July to early August, there was frequently dominant of Imperata cylindrica in the paddy levees vegetation. Relationships between the paddy levees above ground plant biomass and NDVI (Normalized Difference Vegetation Index) values for the 40 sampling sites data showed a highly positive correlation (R2=0.6221, P<0.01), and the estimation of the mean above ground biomass shows 2.6 DWt/ha. If the above ground plant biomass was harvested at the third and forth times, the estimated biomass data shows 7.8-10.4 DWt/(ha yr), it indicate that the plant biomass of paddy levees coincides with the data of Grassland NPP(Net primary productivity) of 9.7 DWt/(ha yr) in the western region of Japan. It is possible that the utilization of the Hyper-spatial image data precisely estimates the small-scale and dispersed ground plant biomass resources.

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