The Dynamic Of Bamboo Carbon Storage Based On 3S Technologies In Area Of Converting Farmland To Forest In Hongya County

Bamboo forest ecosystem is an important component of the ecosystem, in China, it's carbon storage accounted for the proportion of total forest carbon stock has more than 11%, and it become an important carbon unit of ecological system. The carbon storage and mitigation of climate warming capacity of bamboo are more than trees. Because of its high productivity, it was strongly planted in Forest Returned from Farmland, and then, bamboo area showed a rising trend, which means that bamboo is an increasing carbon sinks, study of bamboo carbon storage have a great significance on the correct assessment of the carbon balance in the world.We use 3S technology as a means, remote sensing image data,measured carbon stock data and other basic data as source data, builded remote sensing carbon storage models to study the carbon storage of bamboo in Forest Returned from Farmland, High Precipitation Area of Western China.Based the analyst data, the bamboo area,bamboo carbon storage,bamboo carbon density during early period (1994-1999), middle period (1999-2004), late period (2004-2007) and they temporal of spatial dynamics were researched. Main contents and results are as follows:(1) Through analysis the collinearity and correlation of terrain data, band spectrum data and derived data with carbon storage, elevation, aspect, pi, p2, p7, PC3, SAVI was selected to established a multivariate linear model of remote sensing carbon storage, and this model was optimized by Geostatistical analysis module. The Bamboo carbon storage optimization model's accuracy is 83.01%, and the model is C=82.869+0.0111×elevation+0.013×aspect-1.602xp2-0.925×p7+0.837×PC3+2.942×SAVI(2) Dynamics of bamboo area. The bamboo area of Hongya county during 1994-2007 showed a gradual increase, with a total increase of 7571.79 hm2, the substantial increase was occurred in the middle period of Forest Returned from Farmland. Spatial dynamic of bamboo area showed that:The bamboo area was normal distributed with elevation, the center was 500-1000m. While elevation< 1000m, the bamboo area was increasing year by year,> 1000m bamboo area changes each year varies, the overall decrease, which in 2004a-2007a the bamboo area of 1000-1500m region decrease 1594.71 hm2; Normal distribution with the slope of bamboo area, however, differences in the proportion of the peak, in 1994a and 1999a the proportion of the peak in the 15°-25°, but in 2004a and 2007a the proportion of the peak were in 25°-35°region, the increase of bamboo area mainly occurred in>25°region, the increase amount of 5205.33 hm2, with 68.75% of the total increment; Bamboo area with the slope direction is insignificant, appeared as no aspect at least, uniform distribution of the remaining slope. Bamboo area increased with the aspect year by year, in addition to 2004a-2007a of sunny slope. Bamboo area of dynamic analysis results showed that: The dominant factor of bamboo area substantial increase in Hongya county was Forest Returned from Farmland Project, with the promoting of project and bamboo growth, the bamboo area continued growth of late period. The spatial pattern changes of bamboo area showed that bamboo developed to low altitude, flat slope, and aspect made little effect on bamboo distribution.(3) Dynamics of bamboo carbon storage. The characteristic of bamboo carbon in Hongya county in the 13 years was continuous growth, the growth rate for middle period> late period> early period. The distribuion charcter of bamboo carbon storage was that:when elevation<1000m, the carbon storage increases with elevation increasing, while elevation> 1000m, the carbon storage decreases with elevation increasing,Changes in carbon storage over time showed,<1000m region are increasing,> 1000m region reduce the overall, which in 2004a-2007a have the largest reduction in 1000-1500m region, to 5.22×104t; Bamboo carbon storage distributed with the slope from 1994a-1999a showed that, when slope<25°, the carbon storage increased with the slope increase, and vice versa decrease.2004a-2007a, when slope<35°, the carbon storage increases with the slope incresed, conversely reduced; Bamboo carbon storage distributed with aspect in the same law for each year, the aspect are shady aspect>semi-shady aspect>semi-sunny aspect>sunny aspect>no aspect. The overall trend of carbon storage changes with the aspect showed increased year by year (except 2004a-2007a, sunny aspect).The spatial pattern of bamboo carbon storage changes same with the bamboo area changes, showing the low elevation, flat slope and the aspect uniform trend.(4) Bamboo carbon density ranged from 33.25-33.76 Mg C·hm-2, Which showed first decreased and then change up during 1994a-2007a, the characteristics of the overall decline slightly.(5) Bamboo carbon benefit. According to customary harvesting of bamboo, we can approximately take the growth of bamboo for a dynamic balance. Based on the bamboo carbon storage data, the amount of carbon and yearly carbon sequestration can be calculated. Preliminary estimates the carbon sequestration benefits form Forest Returned from Farmland Project was 0.77 billion, and in the future, the bamboo carbon sinks will create economic benefits for 0.36 million yuan per year. Which means, 2053.79 yuan per hectare.