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 sof...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.展开更多
The characters and effects of available phosphorus in dahurian larch-Manchuria ash mixed stand was analyzed through measuring available phosphorus of rhizosphere-soil, phosphorus of living and withered leaves and tree...The characters and effects of available phosphorus in dahurian larch-Manchuria ash mixed stand was analyzed through measuring available phosphorus of rhizosphere-soil, phosphorus of living and withered leaves and tree height The study results showed that the phosphorus of living leaves of larch was equal to or less than that of ash. For 5-year-old larch-ash ndxed seedlings stand,larch has more available phosphorus in soil, which is not caused by the decomposition of leaves, but the acts of root. The root of larch activates available phosphorus by acidoid fme rhisosphere-soil. At the site with a high concentration of available phosphorus (grondg bean before), 5 aged larch grows faster than the same aged ash in pure stand. The ash at the site with a high concentration of available phosphorus at 20 cm soil layer showed a trend to grow over larch, and at the site, with a low concentration of available phosphorus at 20 cm soil layer, had a trend to be suppressed by same aged larch.展开更多
Analysis on tree hegiht and diameter(DBH) growth of the belt-mixed plantations of Fraxinus mandshurica,Phellodendron amurense and Juglans mandshurica(panted in 1986) were conducted by using the methods of variance ana...Analysis on tree hegiht and diameter(DBH) growth of the belt-mixed plantations of Fraxinus mandshurica,Phellodendron amurense and Juglans mandshurica(panted in 1986) were conducted by using the methods of variance analysis and multiple comparison. The results show that the position of slope is a significant physical factor to affect height growth and DBH growth. Fraxinus mandshurica grew best at meddle hill. Juglans mandshurica grew best at mid-down slope, and Phellodendron amurense grew best at down slope. The analysis of the positive edge effect was also made for belt-mixed plantation of Juglans mandshurica and Larix dahurica. The result indicated that Larix dahurica presented positive edge effect to growth of Juglans mandshurica present.展开更多
文摘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.
文摘The characters and effects of available phosphorus in dahurian larch-Manchuria ash mixed stand was analyzed through measuring available phosphorus of rhizosphere-soil, phosphorus of living and withered leaves and tree height The study results showed that the phosphorus of living leaves of larch was equal to or less than that of ash. For 5-year-old larch-ash ndxed seedlings stand,larch has more available phosphorus in soil, which is not caused by the decomposition of leaves, but the acts of root. The root of larch activates available phosphorus by acidoid fme rhisosphere-soil. At the site with a high concentration of available phosphorus (grondg bean before), 5 aged larch grows faster than the same aged ash in pure stand. The ash at the site with a high concentration of available phosphorus at 20 cm soil layer showed a trend to grow over larch, and at the site, with a low concentration of available phosphorus at 20 cm soil layer, had a trend to be suppressed by same aged larch.
文摘Analysis on tree hegiht and diameter(DBH) growth of the belt-mixed plantations of Fraxinus mandshurica,Phellodendron amurense and Juglans mandshurica(panted in 1986) were conducted by using the methods of variance analysis and multiple comparison. The results show that the position of slope is a significant physical factor to affect height growth and DBH growth. Fraxinus mandshurica grew best at meddle hill. Juglans mandshurica grew best at mid-down slope, and Phellodendron amurense grew best at down slope. The analysis of the positive edge effect was also made for belt-mixed plantation of Juglans mandshurica and Larix dahurica. The result indicated that Larix dahurica presented positive edge effect to growth of Juglans mandshurica present.
