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在孟加拉国吉大港山区选择两块研究地,研究轮换种植对土壤中真菌和细菌群落的影响。两块研究地均包含轮换种植和本地社区管理的乡村森林,第一块研究地点选择在兰加马蒂地区,第二块研究地点选择在吉大港的班多尔班地区。在两个地点和不同用途的地块中,其表面土(0-10cm)和地表下土(10-20cm)的土壤质地不同,分别为砂壤和粘土。轮作地的土壤pH和含水量比乡村森林的低。研究结果表明:在兰加马蒂和班多尔班地区,大多数情况下,轮作地的表面土和地表下土壤中的真菌和细菌群落数量比乡村森林的低。在兰加马蒂和班多尔班地区的轮作地中,炭疽菌属(CoHetrotrichum)和镰孢菌属(Fusarium)真菌稀少,而两个地方的不同用途地块中均有细菌球菌属(Coccus),芽孢杆菌属(Bacillus)和链球菌属(Streptococcus)。在两个地方的不同用途地块中常见的真菌有曲霉属(Aspergillus)、根霉属(Rhizopus)、木霉属(Trichoderma)和青霉菌属(Penicillium)。在其它的土壤区系中,由于轮换种植导致土壤环境退化的程度还需要进一步的研究。
Two research sites were selected in Chittagong Hill Tracts, Bangladesh to study the effects of rotation on fungal and bacterial communities in soil. Both sites include rural forests under rotation and local community management. The first site of study is in the Ranjamati area and the second site of study is in the Bandorban area in Chittagong. The soil texture of surface soil (0-10cm) and surface soil (10-20cm) is different between sandy soil and clay in two sites and plots of different purposes. The rotation of the soil pH and water content is lower than the rural forest. The results of the study showed that in most of the cases in Lanjamati and Bandol areas, the number of fungal and bacterial communities in the topsoil and subsurface soil at the rotation site was lower than in the village forest in most cases. In the rotation of the districts of Ranjatti and Bandol-Ban, CoHetrotrichum and Fusarium fungi are sparsely present, and in different sites in both locations there are Coccus Bacillus, and Streptococcus. Common fungi in different uses in two places are Aspergillus, Rhizopus, Trichoderma and Penicillium. In other soil fauna, further studies are required due to the degree of soil degradation caused by crop rotation.