摘要
植物种群在不同干扰条件下对环境的适应对策可以通过其空间分布格局及关联性反映出来.金露梅是甘南亚高寒草甸中的优势种,通过野外群落调查,运用空间点格局分析的Ripley K函数,分析甘南不同坡向亚高寒草甸中金露梅种群的空间分布格局及其关联性.结果表明:金露梅种群在3个坡向的分布具有显著差异,重要值、生物量和盖度在北坡均高于南坡;北坡和西坡金露梅种群Ⅰ、Ⅱ级个体在小尺度上呈显著聚集分布,随着龄级和空间尺度的增加,金露梅种群聚集强度逐渐减弱,趋向于随机分布;南坡由于其生境条件对金露梅生长的抑制,种间竞争激烈,各级金露梅种群的分布格局均以随机分布为主;不同坡向的金露梅种群Ⅰ、Ⅱ级个体之间在一定尺度内表现为负关联,随着尺度增加,关联度降低,Ⅲ、Ⅳ级与Ⅰ、Ⅱ级个体之间的关联性呈显著负关联;较大个体之间无明显关系,表明年龄接近的个体在空间分布上是相互独立的,利于其充分利用环境资源.
The adaptation strategies of plant populations under different disturbance conditions could be reflected by the distribution pattern and correlation. Potentilla fruticosa is the dominant species in alpine meadow community in south of Gansu Province, China. Based on the field investi- gation, P. fruticosa population spatial distribution pattern and its correlation were studied by using Ripley K function of spatial point pattern analysis. The results showed that the distribution of P. fru- ticosa population had significant differences on different aspects, and its species richness, diversity index and coverage showed a decreasing trend from north to south slope. The class I and Ⅱ indi- viduals of P. frutizosa population significantly aggregated at small scale in north and west slopes, and P. fruticosa clump intensity was gradually weakened with the increase of age and space scale, and finally tended to a random distribution. On south slope, the distribution patterns of all levels of P. fruticosa individuals were dominated by random distribution due to the inhibition of the habitat conditions and interspecific competition. On different slope aspects, P. fruticosa populations be- tween class I and Ⅱ individuals showed a negative correlation at certain scale, but the correlation degree decreased with increasing scale. The relationship between the class Ⅲ and Ⅳ individuals and the class Ⅰ and Ⅱ individuals had negative correlation significantly. There was no significant relationship among the large individuals, indicating that the individuals with similar age was spatial- ly independent, which was conducive to the full use of environmental resources.
出处
《应用生态学报》
CAS
CSCD
北大核心
2017年第6期1817-1823,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(31360114)资助~~
关键词
亚高寒草甸
坡向
金露梅
空间格局
空间关联
subalpine meadow
slope aspect
PotentiUa fruticosa
spatial pattern
spatial correlation.
