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在山区林业调查中,坡面都要进行平面折算,这是由于国土面积是按平面计算的。事实上,坡面面积大于其对应平面面积。与平面相比,坡面增大了树木生长的空间,扩大了树木生存的场合。坡面环境表明:坡面树容量大于其对应平面的树容量。 一、坡面环境及林木 1.坡面环境特点 山坡纵切面可近似看成三角形。如图1,AB为斜面,BC为对应的平面。从三角形的三边关系,AB>BC,即坡面面积大于其对应的平面面积。且随着坡度的增大,两者的差距也在增大。坡面面积的增大是由高度的变化引起的。不在同一等高线的坡面上的两个点,高度
In the mountainous forestry survey, the slope surface should be converted into a flat surface. This is because the area of the land area is calculated on a plane basis. In fact, the slope area is larger than its corresponding plane area. Compared with the plane, the slope increases the space for tree growth and enlarges the tree’s survival. The slope environment shows that the tree capacity of the slope is greater than that of its corresponding plane. First, the slope of the environment and forest 1. Slope environmental characteristics Hillside longitudinal section can be approximated as a triangle. As shown in Figure 1, AB for the bevel, BC for the corresponding plane. Triangular relations from the triangle, AB> BC, that is, the area of the slope is greater than the corresponding area of the plane. And with the increase of slope, the gap between the two is also increasing. The increase of slope area is caused by the change of altitude. Two points, height, not on the same contour line