7种乔木对SO_2清除能力的定量评价

本文采用基于ArcView软件的CITYgreen模型,以东北林业大学哈尔滨实验林场为例,结合航片判读与实地调查,对哈尔滨市7种主要乔木树种对SO2的清除能力进行了定量评价。结果表明：糖械对SO2的清除能力最强。其次是白桦。最弱的落叶阔叶树种为水曲柳。针叶树种对SO2的清除能力普遍低于阔叶树种。随着树木的生长其清除能力有逐步增强的趋势,其清除量增加的强度在生长旺期最大,以后其强度逐渐渐弱。

Harbin The SO2 absorbability of 7 main tree species were evaluated in Harbin

By usingaerial photography and field investigation, the SO2 absorbability of 7 main tree species were evaluated at experiment forestry centre of NEFU in Harbin, with the methods of CITYgreen model based on Arcview software. The result indicate that the SO2 absorbability of Acer negundo is the best, every 100 trees of them can absorb 2.21kg SO2, the direct economic value is 51.31 Yuan; Betula platyphylla is in the next place, every 100 trees of them can absorb 1.89kg SO2, the direct economic value is 43.88 Yuan; the worst among the deciduous and broad leaves tree spec ies is Fra xinus mandshurica, every 100 trees of them can absorb 1.53kg SO2, the direct economic value is35.52Yuan; the ability of SO2 absorbability of needle-leaf tree species is widely under the broad-leaf tree species. the SO2 absorbability of Pinus sylvestris var. mongolica is the best in three needle- leaf tree species, every 100 trees of them can absorb 1.13kg SO2, thedirect economic value is 26.23 Yuan; the worst is Larix gmelinii, every 100 trees of them can absorb0.92kg SO2, the direct economic value is21.36 Yuan. The ability of tree absorbing SO2 increases along with its growing, but the increasing trend is not increasing. The best ability of tree absorbing SO2 is the period of the most 、 vigorous growth, and the absorbing ability decreases gradually.