Integrated ecological planning is a new area of study in the current amendment of the Master Plan of Beijing. Ecological planning emerges alongside with the urban development process: at the stage when the economy of ...Integrated ecological planning is a new area of study in the current amendment of the Master Plan of Beijing. Ecological planning emerges alongside with the urban development process: at the stage when the economy of a city is relatively backward, the main concern of the people is on employment and income. As employment and income being stabilized, people start to focus on展开更多
Biodiversity of arbuscular mycorrhizal （AM） colonization and AM fungal spores were studied in the roots and rhizosphere soils of ,4cacia catechu （L.f）. Wild., A. mangium Willd, Anthocephala cadamba Miq., Artocarpu...Biodiversity of arbuscular mycorrhizal （AM） colonization and AM fungal spores were studied in the roots and rhizosphere soils of ,4cacia catechu （L.f）. Wild., A. mangium Willd, Anthocephala cadamba Miq., Artocarpus chaplasha Roxb., Chickrassia tabularis A. Juss., Swie- tenia macrophylla King., Tectona grandis L. from plantations; Albizia procera （Roxb.） Benth., ,4. falcataria L., Alstonia scholaris （L.） R. Br., ,4phanamixis polystachya （Wall.） Parker., Hydnocarpus kurzii （King.） Warb., Heynea trijuga Roxb., Lagerstroemia speciosa （L.） Pers., Messua ferrea Linn., Podocarpus nerifolia Don., Swintonia floribunda Griff., Syzygiumfruticosum （Roxb.） DC., S. grandis （Wt.） Wal. from forest and nursery seedlings of A. polystachya, A. chaplasha, Gmelina arborea Roxb. and S. cuminii （L.） Skeels from Hazarikhil forest, Chittagong of Bangladesh. Roots were stained in aniline blue and rhiz0sphere soils were assessed by wet sieving and decanting methods. The range of AM colonization varied significantly from 10%-73% in the plantations sam- ples. Maximum colonization was observed in A. mangium （73%） and minimum colonization was observed in C. tabularis （10%）. Vesicular colonization was recorded 15%-67% in five plantation tree species. The highest was in A. cadamba （67%） and the lowest was in T. grandis; A. chaplasha and C. tabularis showed no vesicular colonization. Arbuscular colonization was recorded 12%-60% in four plantation tree species. The highest was in .4. mangium （60%） and the lowest was in A. cadamba. Roots of Artocarpus chaplasha, C. tabularis and T. grandis showed no arbuscular colonization. Among 12 forest tree species, nine tree species showed AM colonization. The highest was in A. falcataria （62%） and the lowest was in S. fruticosum （10%）. Significant variation in vesicular colonization was recorded in seven forest tree species. The highest was in H. trijuga （52%） and the lowest was in L. speciosa 08%）. Hydnocarpus kurzii, M. ferrea, P. nerifolia S. fruticosum and S. grandis showed no vesicular colonization. Arbuscular colonization was recorded in sevenforest tree species. The highest was inA. falcataria （60%） and the lowest was in A. procera （10%）. All the nursery seedlings showed AM coloniza- tion and the range was 10%-73%. Vesicules were recorded in G. arbo- rea （40%） and S. cumini （40%）. Arbuscular colonization was recorded in G. arborea （100%） and S. cumini （100%）. Spore population was re- corded 77-432/100 g dry soils, 80-276/100 g dry soils, and 75-153/100g dry soils in plantation, forest and nurse.ry, respectively. Glomus and Acaulospora were dominant genera among the six AM fungi recorded. Significantly positive correlation was observed between/AM colonization and AM fungal spore population in Hazarikhil plantation tree species, forest tree species and nursery tree seedlings. The present study showed the biodiversity of root colonization and AM fungi are active in nutrient cycling, survivals and seedling establishment of the plants in the Hazarikhil forest, plantation and nursery.展开更多
文摘Integrated ecological planning is a new area of study in the current amendment of the Master Plan of Beijing. Ecological planning emerges alongside with the urban development process: at the stage when the economy of a city is relatively backward, the main concern of the people is on employment and income. As employment and income being stabilized, people start to focus on
文摘Biodiversity of arbuscular mycorrhizal （AM） colonization and AM fungal spores were studied in the roots and rhizosphere soils of ,4cacia catechu （L.f）. Wild., A. mangium Willd, Anthocephala cadamba Miq., Artocarpus chaplasha Roxb., Chickrassia tabularis A. Juss., Swie- tenia macrophylla King., Tectona grandis L. from plantations; Albizia procera （Roxb.） Benth., ,4. falcataria L., Alstonia scholaris （L.） R. Br., ,4phanamixis polystachya （Wall.） Parker., Hydnocarpus kurzii （King.） Warb., Heynea trijuga Roxb., Lagerstroemia speciosa （L.） Pers., Messua ferrea Linn., Podocarpus nerifolia Don., Swintonia floribunda Griff., Syzygiumfruticosum （Roxb.） DC., S. grandis （Wt.） Wal. from forest and nursery seedlings of A. polystachya, A. chaplasha, Gmelina arborea Roxb. and S. cuminii （L.） Skeels from Hazarikhil forest, Chittagong of Bangladesh. Roots were stained in aniline blue and rhiz0sphere soils were assessed by wet sieving and decanting methods. The range of AM colonization varied significantly from 10%-73% in the plantations sam- ples. Maximum colonization was observed in A. mangium （73%） and minimum colonization was observed in C. tabularis （10%）. Vesicular colonization was recorded 15%-67% in five plantation tree species. The highest was in A. cadamba （67%） and the lowest was in T. grandis; A. chaplasha and C. tabularis showed no vesicular colonization. Arbuscular colonization was recorded 12%-60% in four plantation tree species. The highest was in .4. mangium （60%） and the lowest was in A. cadamba. Roots of Artocarpus chaplasha, C. tabularis and T. grandis showed no arbuscular colonization. Among 12 forest tree species, nine tree species showed AM colonization. The highest was in A. falcataria （62%） and the lowest was in S. fruticosum （10%）. Significant variation in vesicular colonization was recorded in seven forest tree species. The highest was in H. trijuga （52%） and the lowest was in L. speciosa 08%）. Hydnocarpus kurzii, M. ferrea, P. nerifolia S. fruticosum and S. grandis showed no vesicular colonization. Arbuscular colonization was recorded in sevenforest tree species. The highest was inA. falcataria （60%） and the lowest was in A. procera （10%）. All the nursery seedlings showed AM coloniza- tion and the range was 10%-73%. Vesicules were recorded in G. arbo- rea （40%） and S. cumini （40%）. Arbuscular colonization was recorded in G. arborea （100%） and S. cumini （100%）. Spore population was re- corded 77-432/100 g dry soils, 80-276/100 g dry soils, and 75-153/100g dry soils in plantation, forest and nurse.ry, respectively. Glomus and Acaulospora were dominant genera among the six AM fungi recorded. Significantly positive correlation was observed between/AM colonization and AM fungal spore population in Hazarikhil plantation tree species, forest tree species and nursery tree seedlings. The present study showed the biodiversity of root colonization and AM fungi are active in nutrient cycling, survivals and seedling establishment of the plants in the Hazarikhil forest, plantation and nursery.
