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

利用高分辨率卫星IKONOS和QuikBird估算了日本雪松人工林的碳汇。目标区是新泻县的Maki(靠近Kakuta山)和Tsugawa镇。在整个区域内，在Maki镇周围设置了21个样地，在Tsugawa镇周围设置了45个样地，并研究了样地体积与样地位置对应的波段3的数字编号之间的相关性。在此基础上，利用新泻县地理信息系统提取杉木人工林，并将卫星影像与森林图进行叠加，由指数回归方程推定小班蓄积量。森林储存的碳汇的数量可以通过体积乘以容量密度和碳速率来推定。一棵日本雪松的容量密度为0.32，碳率为0.5。通常，碳包含在…中此外，不仅在茎中，而且在树枝、叶和根中，茎的膨胀系数1.7被用来推定整个碳的量。然而，由于这次考虑了材积的推定，只推定了从材积中储存的碳量，因此，马基镇的日本雪松人工林的碳汇数量为39,988吨，津川镇的碳汇数量为180,101吨。另一方面，我们在日本的私人森林中有森林登记。然而，这个森林蓄积量是通过计算机中的生长公式计算出来的。为了用公式进行计算，表明目前的蓄积量条件不适合，我们对森林登记蓄积量和高分辨率卫星蓄积量进行了比较。高分辨率卫星对马基镇的均方平均值为134m~3/ha，森林登记的均方平均值为162m~3/ha。以津川镇为例，高分辨率卫星的均方根误差分别为220m~3/ha和239 m~3/ha。用高分辨率卫星估测蓄积量比用林木登记估测要好。较少

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