Ảnh hưởng của sự biến đổi đặc trưng hạt trong loài đến sự nảy mầm của tám loài rừng khô nhiệt đới

Natalia Villa-Rivera1, Jeiner Castellanos-Barliza1, Ariadna Mondragón-Botero2, Willinton Barranco-Pérez1
1Grupo de Investigación en Restauración Ecosistémica y Ecología Urbana, Facultad de Ciencias Básicas, Universidad del Magdalena, Magdalena, Colombia
2Department of Plant and Microbial Biology, University of Minnesota, St. Paul, USA

Tóm tắt

Các đặc trưng chức năng có thể có sự biến đổi cả trong loài và giữa các loài, rất quan trọng trong cấu trúc và động lực của các cộng đồng tự nhiên. Những đặc trưng này có thể ảnh hưởng đến các giai đoạn nảy mầm và thiết lập cây con trong hạt giống. Mục tiêu của nghiên cứu này là đánh giá ảnh hưởng của sự biến đổi về khối lượng, thể tích và hàm lượng dinh dưỡng (C, N và P) đến sự nảy mầm của tám loài đại diện cho rừng khô nhiệt đới (TDF). Kết quả của chúng tôi cho thấy kích thước hạt, cả về khối lượng và thể tích, không dự đoán được tỷ lệ hoặc tỷ lệ phần trăm nảy mầm, cũng như không có mối liên hệ với hàm lượng dinh dưỡng. Ngược lại, hàm lượng N là đặc trưng quan trọng nhất trong giai đoạn nảy mầm. Hạt lớn không nảy mầm nhiều hơn hoặc nhanh hơn, nhưng chúng có thể cung cấp sức đề kháng tốt hơn chống lại sự khô hạn, vì chúng có tỷ lệ C/N cao hơn trong mô của chúng, một đặc tính của hạt giống điển hình. Các loài A. guachapele, B. arborea, H. crepitans và V. tortuosa cho thấy tiềm năng sinh học cao về khả năng tái sinh của chúng, đặc biệt là vì các đặc tính của hạt giống cũng như hàm lượng dinh dưỡng của chúng cho thấy những ảnh hưởng nhất quán trong thành công sinh sản, thúc đẩy tỷ lệ nảy mầm cao trong thời gian ngắn. Nói chung, kết quả thu được trong nghiên cứu này cung cấp kiến thức cơ bản cho các nghiên cứu trong tương lai, đồng thời đưa ra điểm khởi đầu cho việc khám phá sâu hơn về các sự thích nghi đặc thù của loài và cách mà chúng có thể bị ảnh hưởng bởi môi trường.

Từ khóa

#nảy mầm #đặc trưng sinh học #rừng khô nhiệt đới #hàm lượng dinh dưỡng

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