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本文论述了孟加拉国吉大港大学校园里,不同年龄(5、10、20年)的羯布罗香(DipterocarpusturbinatusGaertn.F)人工林内,距树木基部不同距离(1、2、3、4米)处,外生侵染菌根的水平分布状况。在山的3个部位(顶部、中部和下部)对各人工林外生侵染菌根的侵染进行了测定。在不同水平分布距离处的树下采集了1000cm3的根际土壤样本,不同距离和山高处的外生侵染菌根浸染率差异显著。在5年和10年林龄的人工林内,浸染率随着距树的距离的增加而快速下降,而在20年林龄的人工林内,浸染率随着距树基部距离的增加而急剧增加。山下部20年生人工林内距树4m处的浸染率最高(81.3%),山顶部5年生人工林内距树4m处的浸染率最低(55.33%)。
In this paper, we present the species diversity of Dipterocarpus furbatus Gaertn.F at different ages (5, 10, 20 years) on the campus of Chittagong University in Bangladesh, at different distances from the base of the tree (1,2,3,4 m) The horizontal distribution of ectomycorrhizal infection. The infection of mycorrhizal fungi in plantations was determined at three sites (top, middle and bottom) of the mountain. The rhizosphere soil samples of 1000cm3 were collected under the tree with different horizontal distribution distances. The difference of the mycorrhizal colonization rate of exogenous infection was significant at different distances and hillsides. In 5-year-old and 10-year-old plantations, the rate of dipping rapidly declined with increasing distance from the tree, whereas in the 20-year-old plantation, the rate of dipping increased sharply with increasing distance from the base of the tree. The highest dipping rate (81.3%) was in the 20-year-old plantation below the tree and the lowest in the 4-m tree (55.33%) in the top 5-year-old plantation.