尺度思想是地理核心思维方法，在分析植被时空变化时具有独特优势。本文以校园草坪为对象，采用五点取样法调查植物种群密度，同时测量光照、土壤温湿度等环境因子。结果显示：冬季天井草坪蒲公英密度远高于操场草坪，这与踩踏、风力、养护方式有关；夏季天井草坪优势种由蒲公英更替为牛筋草和狗尾草。从地理时间尺度判断，该季节性更替属于短期环境波动，并非长期演化的群落演替。基于此，本文以争论点“演替还是波动”作为教学切入点，探讨如何依托日常校园场景开展地理与生物跨学科融合教学，为落实地理实践力培养提供案例参考。 

As a core thinking approach of geography, scale thinking has unique strengths in analyzing the temporal and spatial variations of vegetation. This paper takes the campus lawn as the research object, adopts the fi ve-point sampling method to investigate plant population density, and measures environmental factors such as light intensity, soil temperature and humidity simultaneously. The results show that the dandelion density in the courtyard lawn in winter is far higher than that in the playground lawn, which is associated with trampling, wind force and maintenance modes. In summer, the dominant species in the courtyard lawn shifts from dandelion to goosegrass and green foxtail. Judging from the geographical time scale, this seasonal alternation belongs to short-term environmental fl uctuation rather than long-term evolutionary community succession. On this basis, this paper takes the controversial issue "succession or fl uctuation" as the teaching entry point, discusses how to carry out interdisciplinary integrated teaching of geography and biology based on daily campus scenarios, and provides case references for implementing the cultivation of Geography Praxis.