摘要
研究西藏拉萨市当雄县纳木措乡番龙山的植被功能群体在不同海拔、纬度、经度、坡向、坡度的植物分布状况,主要植物群体:深入调查禾本科和莎草科、阔叶草本等。番龙山区植物群落物种丰富度和多样性指数随海拔呈现出梯度变化,表现出山体的高与低海拔区稍高、山体中海拔较低的趋势。在部分植物群落的物种丰富与多样性指数表现出以下特征:草本层>灌木层>乔木层,使草本层植物的变化在很大程度上影响到不相同海拔植物群落物种多样性指数。草本、灌木和乔木层物种多样性指数因群落梯度上的不同变异方式与程度而有所不同。通过观察群落物种丰富与多样性可知,同样坡向的物种丰富与多样性沿海拔梯度的变化规律基本相同,但是,阳、阴坡的变化表现出较大区别。在群落梯度上的分布趋势,物种丰富度和多样性指数是统一的,可以清晰的看出不相同的植物群落在不同海拔梯度上表现的差异。乔木层、灌木层和草本层均匀度指数沿海拔梯度上虽有波动,但是整体而言,变化趋势不明显。
The distribution of vegetation function groups in Panlong Mountain,Namtso Township,Damxung County,Lhasa City,Tibet,at different altitudes,latitudes,longitudes and slopes were studied.In-depth investigation of major plant groups such as Gramineae and Cyperaceae were also studied.The species richness and diversity index of the plant community in the Panlong mountainous area show a gradient change with altitude,showing a trend that the high and low altitude areas of the mountain are slightly higher,and the altitude of the mountain is lower.In some plant communities,the species richness and diversity index showed the following characteristics:herb layer>shrub layer>arbor layer,so that the change of herb layer plants greatly affected the species diversity index of plant communities at different altitudes.By observing the species richness and diversity of the community,we can see that the species richness and diversity of the same slope direction have basically the same changes along the altitude gradient,but the changes of sunny and shaded slopes show a big difference.The distribution trend on the community gradient,the species richness and the diversity index are unified,and the differences in the performance of different plant communities on different altitude gradients can be clearly seen.Although the uniformity index of tree layer,shrub layer and herb layer fluctuates along the altitude gradient,overall,the change trend is not obvious.
作者
仁增旺堆
片多
Renzengwangdui;Pianduo(Institute of Grassland Science,Tibet Academy of Agriculture and Animal Husbandry Sciences,Tibet Lhasa 850000,China)
出处
《西藏农业科技》
2020年第S01期44-47,共4页
Tibet Journal of Agricultural Sciences
基金
国家牧草产业技术体系拉萨综合试验站(CARS-34)
第二次青藏高原综合科学考察研究课题植物多样性可持续利用与评估(2019QZKK0502)子课题“传统农业植物资源调查与研究评估”(2019QZKK05020302)。
关键词
西藏
植被功能群体
海拔梯度
Tibet
Vegetation functional groups
Altitude gradient
