Based on the GIS technology, CITYgreen computer model was used in this paper to estimate ecological benefits of urban forest in the park of Hefei city.It used this technology to make an analysis on urban forest ecolog...Based on the GIS technology, CITYgreen computer model was used in this paper to estimate ecological benefits of urban forest in the park of Hefei city.It used this technology to make an analysis on urban forest ecological benefits. The research discussed how to use the technology of CITYgreen model developed in USA to account urban forest benefits in China. The results showed that forests in Xiaoyao Jin Park occupied about 52.62% of park land area and Xinghua Park13.00% respectively, indicating that Xiaoyaojin Park is dominated by large trees such as arbors, and Xinghua Park dominated by laws, with low coverage. Besides,the comprehensive eco-benefits of Xiaoyaojin Park and Xinghua Park were 5.150 3and 1.354 3 million yuan and per unit area eco-benefits were 144 000 and 47 400yuan/hm^2, which indicated that Xiaoyaojin Park makes the greatest contribution in ecological benefits.展开更多
Sustainable urban forest management is still an evolving concept, particularly as it pertains to a sustainable supply of ecosystem benefits and management planning. Urban forestry maintains a greater human dimension c...Sustainable urban forest management is still an evolving concept, particularly as it pertains to a sustainable supply of ecosystem benefits and management planning. Urban forestry maintains a greater human dimension component than traditional timber-oriented rural forestry because urban trees grow in city centers and neighborhoods, supplying critical ecosystem benefits to the population centers. The overall goal of this study was to evaluate the relationship of urban forest stand structure and its temporal dynamics with the sustainable supply of ecosystem benefits in university environments. Individual tree data were collected from a completed inventory, while the i-Tree Eco model was used to generate ecosystem benefits data from the Clemson urban forest. The cumulative-benefits supply curve had an inverted J-shaped curve, but the average supply curve had a negative slope against the species richness. Likewise, individual tree variables total height, DBH, leaf area, and crown height strongly correlated with the total ecosystem services supply. Based on the temporal supply trends, the study area trees were broadly segmented into three groups: establishment, growth, and legacy, with 65%, 31%, and 4% frequency distribution, respectively. Urban forest managers need to identify forest management goals and preferred ecosystem benefits among the urban communities to guide the required forest structure and dynamics to ensure a sustainable and functioning urban forest.展开更多
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
为了探究典型城市森林土壤团聚体稳定性旱季变化特征及影响因子,以广州市不同演替阶段的针叶林(Pine forest,PF)、针阔混交林(Mixed pine and broadleaf forest,MF)、常绿阔叶林(Broad-leaved evergreen forests,BF)为研究对象,分析表层...为了探究典型城市森林土壤团聚体稳定性旱季变化特征及影响因子,以广州市不同演替阶段的针叶林(Pine forest,PF)、针阔混交林(Mixed pine and broadleaf forest,MF)、常绿阔叶林(Broad-leaved evergreen forests,BF)为研究对象,分析表层土(0—10 cm)和剖面土(10—30 cm)团聚体稳定性、理化性质和微生物生物量及胞外酶活性等相关因子特征,以及土壤团聚体稳定性驱动因素与影响因素的耦合关系。结果表明,(1)土壤团聚体机械稳定性的平均重量直径(D_(MW))随土壤深度增加呈减小趋势,相反,几何平均直径(D_(GM))和重量分形维数(D_(m))随土壤深度增加呈增大趋势。土壤团聚体水稳性的D_(MW)和D_(GM)呈MF>BF>PF,而D_(m)变化与之相反。(2)土壤微生物酶活性易受磷限制,其受限制程度呈MF>BF>PF,与土壤团聚体水稳性在森林类型中变化规律一致。(3)土壤理化性质、微生物生物量、酶活性等因子对土壤团聚体机械稳定性整体空间差异解释程度为13.3%,而对土壤团聚体水稳性整体空间差异解释程度为40.0%。(4)土壤微生物熵和微生物胞外酶活性是土壤团聚体稳定性的主要驱动因子,水稳性主要受微生物生物量碳和酸性磷酸酶活性影响,而其机械稳定性主要受微生物生物量氮磷影响。(5)演替后期的针阔混交林和常绿阔叶林土壤表现出较高的碳利用效率及较低的氮利用效率,微生物可通过调控微生物生物量和调节碳氮元素利用效率来改善演替后期群落受磷限制状况,进而影响土壤团聚体稳定性。研究结果可为城市森林土壤质量评价和生态环境保护提供理论依据。展开更多
基金Supported by Huainan Normal Univeristy Science Research Program(2013XJ66)~~
文摘Based on the GIS technology, CITYgreen computer model was used in this paper to estimate ecological benefits of urban forest in the park of Hefei city.It used this technology to make an analysis on urban forest ecological benefits. The research discussed how to use the technology of CITYgreen model developed in USA to account urban forest benefits in China. The results showed that forests in Xiaoyao Jin Park occupied about 52.62% of park land area and Xinghua Park13.00% respectively, indicating that Xiaoyaojin Park is dominated by large trees such as arbors, and Xinghua Park dominated by laws, with low coverage. Besides,the comprehensive eco-benefits of Xiaoyaojin Park and Xinghua Park were 5.150 3and 1.354 3 million yuan and per unit area eco-benefits were 144 000 and 47 400yuan/hm^2, which indicated that Xiaoyaojin Park makes the greatest contribution in ecological benefits.
文摘Sustainable urban forest management is still an evolving concept, particularly as it pertains to a sustainable supply of ecosystem benefits and management planning. Urban forestry maintains a greater human dimension component than traditional timber-oriented rural forestry because urban trees grow in city centers and neighborhoods, supplying critical ecosystem benefits to the population centers. The overall goal of this study was to evaluate the relationship of urban forest stand structure and its temporal dynamics with the sustainable supply of ecosystem benefits in university environments. Individual tree data were collected from a completed inventory, while the i-Tree Eco model was used to generate ecosystem benefits data from the Clemson urban forest. The cumulative-benefits supply curve had an inverted J-shaped curve, but the average supply curve had a negative slope against the species richness. Likewise, individual tree variables total height, DBH, leaf area, and crown height strongly correlated with the total ecosystem services supply. Based on the temporal supply trends, the study area trees were broadly segmented into three groups: establishment, growth, and legacy, with 65%, 31%, and 4% frequency distribution, respectively. Urban forest managers need to identify forest management goals and preferred ecosystem benefits among the urban communities to guide the required forest structure and dynamics to ensure a sustainable and functioning urban forest.
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.
文摘为了探究典型城市森林土壤团聚体稳定性旱季变化特征及影响因子,以广州市不同演替阶段的针叶林(Pine forest,PF)、针阔混交林(Mixed pine and broadleaf forest,MF)、常绿阔叶林(Broad-leaved evergreen forests,BF)为研究对象,分析表层土(0—10 cm)和剖面土(10—30 cm)团聚体稳定性、理化性质和微生物生物量及胞外酶活性等相关因子特征,以及土壤团聚体稳定性驱动因素与影响因素的耦合关系。结果表明,(1)土壤团聚体机械稳定性的平均重量直径(D_(MW))随土壤深度增加呈减小趋势,相反,几何平均直径(D_(GM))和重量分形维数(D_(m))随土壤深度增加呈增大趋势。土壤团聚体水稳性的D_(MW)和D_(GM)呈MF>BF>PF,而D_(m)变化与之相反。(2)土壤微生物酶活性易受磷限制,其受限制程度呈MF>BF>PF,与土壤团聚体水稳性在森林类型中变化规律一致。(3)土壤理化性质、微生物生物量、酶活性等因子对土壤团聚体机械稳定性整体空间差异解释程度为13.3%,而对土壤团聚体水稳性整体空间差异解释程度为40.0%。(4)土壤微生物熵和微生物胞外酶活性是土壤团聚体稳定性的主要驱动因子,水稳性主要受微生物生物量碳和酸性磷酸酶活性影响,而其机械稳定性主要受微生物生物量氮磷影响。(5)演替后期的针阔混交林和常绿阔叶林土壤表现出较高的碳利用效率及较低的氮利用效率,微生物可通过调控微生物生物量和调节碳氮元素利用效率来改善演替后期群落受磷限制状况,进而影响土壤团聚体稳定性。研究结果可为城市森林土壤质量评价和生态环境保护提供理论依据。
