Agroforestry Systems Based On 3s Technology Landscape Pattern Analysis

Based on the TM images of 1989 year and 2000 year and the forest resource researching data of 1990 year and 1999 year, and using the RS, GIS, GPS technology, this paper studies the agro-forest complex landscape pattern changes in Huitong, Hunan province. The result shows that the region's agro-forest complex landscape pattern becomes better. The research results are as follows:(1)Analysis forest landscape area dynamic changeBased on the remote sense analysis result and the forest resource researching data, we can know that the areas of farmland bare land and shrubbery decrease. Because of the policy of changing farmland to forest, the farmland area decreases most. But, the areas of water area, fir forest, pine forest, broad-leaf forest, bamboo forest, economy forest increase. The fir forest area increases most, because of the market requirement.(2) Analysis forest landscape element patch characteristicsAccording to the result, as the landscape element patch scale, the fir forest average patch scale is the largest, and it shows that and the rest in large-to-small succession are: water area, farmland, broad-leaf forest, pine forest, economy forest, shrubbery. As the landscape element patch shape index, from large to small, is farmland, economy forest, water area, pine forest, fir forest, fir forest, shrubbery, broad-leaf forest, bare land, bamboo forest. It explains the farmland patch shape is the most complex, and the rest become weaken. Result of manual-planting, the bamboo patch shape is the least complex. Compared with two days, the complexities of pine forest, fir forest, shrubbery, broad-leaf forest trend to less, it can help to increase forest area.(3) Analysis forest landscape heterogeneousThe landscape dominance degree of the research region lessens, and the diversity and the assembling degree boosts up. The patches become even, and the total landscape heterogenous becomes better. As the landscape element dominance degrees, the farmland's, the bare land's, and the shrubbery's become less, but the woodlands' become higher. It shows that the woodland landscape holds the important position in whole landscape.(4) Analysis forest landscape element special correlationAs the landscape element connect degree, from large to small, is: farmland, broad-leaf forest, fir forest, economy forest, shrubbery, bamboo forest, pine forest, bare land, water area. The connect degree of farmland patches is the highest. The most of farmland distributes the riverside and the flat region, so its connectivity is best. Most of broad-leaf forest distributes in the Ying Juyan protection region of nature, so its connectivity is better. The water area distributes in the east and west of the research region, so its connectivity is worst. As the landscape element assembling degree, from large to small, is: farmland, water area, bare land, shrubbery, economy forest, fir forest, bamboo forest, pine forest, broad-leaf forest. It shows that farmland, water area, bare land, shrubbery are distributing in other patches, nevertheless, the others are connecting with fewer large patch.