Emergency estimation of carbon stock in forest using high-resolution space images data

利用IKONOS和QuikBird高分辨率卫星对杉木人工林碳汇进行了估算。目标区域是牧木（靠近角田山）和新泻县津川镇。在整个区域内，在牧木镇周围设置了21个样地，在津川镇周围设置了45个样地，并对样地体积与样地位置对应的3波段数字数进行了相关性研究。得到了图体积与数字数之间的指数回归方程。然后，利用新泻县GIS对杉木人工林进行提取，并将卫星影像与森林地图叠加，根据上述指数回归方程推定子室体积。森林储存的碳汇量可以通过体积乘以容量密度和碳速率来推测。杉木的容量密度为0.32，碳率为0.5。一般来说，碳不仅包含在茎中，而且包含在枝、叶和根中，在茎中，用膨胀系数1.7来假设碳的总量。但由于本次课题考虑了体积的推定，所以只推定了体积储存的碳量。因此，真木镇杉木人工林的碳汇量为39988吨，津川镇杉木人工林的碳汇量为180101吨。另一方面，我们日本的私人森林有森林登记。然而，这个森林登记册的体积是由计算机中的生长公式计算出来的。为了用公式计算，表明目前的体积条件不合适。我们比较了森林登记和高分辨率卫星的体积。高分辨率卫星RMSE为134m3/ha，森林登记RMSE为162m3/ha。津川镇高分辨率卫星RMSE分别为220m3/ha和239m3/ha。利用高分辨率卫星进行体积估算比利用森林登记更好。少

The amount of carbon sink of Japanese cedar plantation was presumed using high resolution satellites IKONOS and QuikBird. The object area is Maki(near Mt.Kakuta) and Tsugawa town in Niigata Prefecture. In the whole area, 21 plots were set up around Maki town and 45 plots were set up around Tsugawa town and when correlation between volume of a plot and the digital number of the band 3 which corresponds at a plot position was investigated. Exponential regression equation was obtained between volume of plot and digital number.Then, using the Niigata Prefecture GIS, the Japanese cedar plantation was extracted and the satellite image and forest map were overlaid, Volume of subcompartment was presumed from above-mentioned exponential regression equation. The amount of carbon sink which a forest stores can be presumed by multiplying volume by capacity density and the rate of carbon. The capacity density of a Japanese cedar is 0.32 and the rate of carbon is 0.5. Generally, carbon is contained … More not only in a stem but in a branch, a leaf, and a root, Form stem, the expansion coefficient 1.7 is used for presuming the whole amount of carbon. However, since presumption of volume was taken into consideration to the subject this time, only the amount of carbon stored from volume was presumed.Consequently, the amount of carbon sink of the Japanese cedar plantation of Maki town is 39,988 ton and 180,101 ton in Tsugawa town. On the other hand, there is a forest register in our private forest in Japan. However, volume of this forest register is calculated by the growth formula in a computer. In order to calculate by formula, indication that the present volume condition is not suited.We compared volume of forest register and of high resolution satellites. RMSE(square average value) of Maki town by high resolution satellites is 134m3/ha and 162m3/ha from forest register. In case of Tsugawa town, RMSE of high resolution satellites is220m3/ha and 239m3/ha from forest register. It is better to estimate volume using high resolution satellites than forest register. Less