The article summarized the species diversity index and regeneration of young Linzhi spruce stand at Linzhi region in Tibet. It showed that the diversity index of the young Linzhi spruce stand community was high. The S...The article summarized the species diversity index and regeneration of young Linzhi spruce stand at Linzhi region in Tibet. It showed that the diversity index of the young Linzhi spruce stand community was high. The Simpson diversity index is 0.871, while the Shannon Wiener diversity index is 3.976. But the diversity index of arbor layer of young Linzhi spruce stand was lower. Its Simpson diversity index was 0.336,the Shannon wiener diversity index was 0.899. Linzhi spruce occupied 89% of the regeneration sapling.Its average basal diameter, average height was 3.5cm and 125cm respectively. The linzhi spruce regeneration sapling grew well. The authors suggest that local forestry bureau should carry on closing hill for afforestation in this area continually. At the same time, artificial regeneration measures should be taken to improve the young Linzhi spruces crown density.展开更多
为了用水生生物生态状况评价乌江的水质情况,在乌江干、支流布置了14个采样断面,以Novak等的百分比模式相似性指数(Percent Model Affinity,PMA)对水电建设期间的乌江下游水质状态进行了评价,并与种类丰富度、EPT%和物种多样性指数相关...为了用水生生物生态状况评价乌江的水质情况,在乌江干、支流布置了14个采样断面,以Novak等的百分比模式相似性指数(Percent Model Affinity,PMA)对水电建设期间的乌江下游水质状态进行了评价,并与种类丰富度、EPT%和物种多样性指数相关性分析结果进行了比较。结果表明,支流除郁江水质一般(Moderate)外,其余断面水质处于良好(Good)状态,干流除彭水和洪渡较好外,其余断面水质一般(Moderate)。总体而言,支流水质要好于干流,导致乌江水质恶化的根源主要并不是有机污染,其原因可能与水电工程的建设活动及频繁航运有关。分析表明,百分比模式相似性指数与种类丰富度、EPT%和物种多样性指数相关性均达到显著水平。展开更多
文摘The article summarized the species diversity index and regeneration of young Linzhi spruce stand at Linzhi region in Tibet. It showed that the diversity index of the young Linzhi spruce stand community was high. The Simpson diversity index is 0.871, while the Shannon Wiener diversity index is 3.976. But the diversity index of arbor layer of young Linzhi spruce stand was lower. Its Simpson diversity index was 0.336,the Shannon wiener diversity index was 0.899. Linzhi spruce occupied 89% of the regeneration sapling.Its average basal diameter, average height was 3.5cm and 125cm respectively. The linzhi spruce regeneration sapling grew well. The authors suggest that local forestry bureau should carry on closing hill for afforestation in this area continually. At the same time, artificial regeneration measures should be taken to improve the young Linzhi spruces crown density.
文摘为了用水生生物生态状况评价乌江的水质情况,在乌江干、支流布置了14个采样断面,以Novak等的百分比模式相似性指数(Percent Model Affinity,PMA)对水电建设期间的乌江下游水质状态进行了评价,并与种类丰富度、EPT%和物种多样性指数相关性分析结果进行了比较。结果表明,支流除郁江水质一般(Moderate)外,其余断面水质处于良好(Good)状态,干流除彭水和洪渡较好外,其余断面水质一般(Moderate)。总体而言,支流水质要好于干流,导致乌江水质恶化的根源主要并不是有机污染,其原因可能与水电工程的建设活动及频繁航运有关。分析表明,百分比模式相似性指数与种类丰富度、EPT%和物种多样性指数相关性均达到显著水平。
