把課堂搬到自然，生物課當然要接地氣！

　　陽光透過樹葉的縫隙，灑在專注的臉龐，每一次呼吸都充滿了自然的芬芳。在大自然中，生物不再是書本上的彩色圖片，而是觸手可及的鮮活體驗。用指尖去感受葉脈的紋理，用筆尖去記錄發(fā)現(xiàn)的驚喜，讓知識在自然的懷抱中盡情綻放。

　　在生物學科組王歆珺老師的帶領(lǐng)下，北京外國語大學國際課程中心12年級生物小隊出發(fā)紫竹院公園進行實地勘測。同學們在老師的指導下，使用隨機采樣和系統(tǒng)采樣兩種調(diào)研方法對紫竹院公園的植被進行調(diào)研。

　　王歆珺老師介紹道：“通過實地勘測的方式可以更好地幫助同學們理解各種生態(tài)學概念及其應用，比如物種分布比例和物種分布頻率，如何設置樣方，隨機采樣所需要的面積測試和系統(tǒng)采樣需要的地形變化，最終采集到的數(shù)據(jù)使用Simpson index加以分析�！�

　　張迪予同學分享到：“在紫竹院公園進行實地調(diào)查的過程中，我深刻感受到了生物多樣性的豐富和生態(tài)系統(tǒng)的復雜。通過對比湖邊和竹林兩個不同棲息地的物種多樣性，我學會了如何科學地收集和分析數(shù)據(jù)。我們花費了20分鐘制作精確的樣方框，并完成了數(shù)據(jù)收集。隨后我們學習了如何計算Simpson指數(shù)，并理解了它在衡量生物多樣性中的意義。蚊蟲的侵擾讓我體會到了進行物種調(diào)查的艱辛，但這個過程也鍛煉了我的觀察力和耐心，同時增強了我對維系生物多樣性的認識。每一次發(fā)現(xiàn)都讓我無比興奮，這次實踐經(jīng)歷不僅讓我更加尊重生命，也激發(fā)了我對生物學深入研究的熱情�！�

　　張繼勻同學也分享到：“When we were learning about the samplings of species, the use of quadrats in random sampling was quite confusing. Hence, our Biology teacher Anna took the class on a field trip to experiment with the biodiversity of a specific habitat. Our destination was Zizhuyuan Park, we were divided into two groups which had to measure either land close to the water or land far from the water. The quadrat we need is a square frame that marks off an area with its species. We made the quadrat out of strings of 50 centimetres and formed 25 squares. The number of species collected from the two groups was very different. From the land near water, the group has discovered 8 species of plant, however the other group only found 2 species. Also, we had to count the number of individuals in each species in 10 squares randomly picked to complete the random sampling process. After measuring and comparing, we made tables for the data collected and analyzed Simpson’s index of diversity over calculation. The result from the calculation showed the difference in biodiversity between the two places which referred to the effect on environmental conditions.”

　　陽光、樹葉、芬芳的空氣，還有那些觸手可及的生命體，共同構(gòu)成了一個充滿生命力的生物課堂，而學生求知的渴望和求真的精神，正在此間悄然生根發(fā)芽。讓我們一起期待下一次的探索之旅吧！

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