This is the vegetational climate of arctic permafrost regions . 这是北极永冻地区的植物气候。
2.
It also contributes to the terrestrial paleoecological and paleoenvironmental issues , such as vegetational evolution , changes in c3 to c4 plants and paleolimnologic variatiuns 有机生物地球化学也能在陆地古生态系统中植被的演变、 c3与c4植物的消长变化、湖泊水体环境的变化等方面作出独特的贡献。
3.
The higher landscape heterogeneity , the closer to nature secondary forest . along the gradient , landscape congregation index exhibits descendent tendency , showing a significant relationship between the extent of patch mosaic and the extent of disturbance , according to changes of landscape mean shape index ( lmsi ) and landscape mean fractal dimension index , integrated disturbance ( nature disturbance , human activities , vegetational inner succession or population dynamics ) tend to enhance 景观聚集度指数是随着梯度区呈下降的变化趋势，表明斑块之间的镶嵌联系的程度与受到的干扰程度有极为重要的关系。从景观平均形状指数和景观平均分维数的变化，可看出综合干扰(自然干扰、人为活动、植被的内源演替或种群的动态变化)是呈增强的发展趋势。
