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Bẫy phấn hoa hàng năm tiết lộ sự phức tạp của sự kiểm soát khí hậu đối với năng suất phấn hoa ở châu Âu và Kavkaz
Tóm tắt
Tốc độ tích lũy phấn hoa hàng năm (PAR; hạt/cm²/năm) đã được nghiên cứu bằng cách sử dụng các bẫy Tauber đã được điều chỉnh đặt tại mười vùng, ở Ba Lan (Roztocze), Cộng hòa Séc (hai vùng ở Krkonoše, hai vùng ở Šumava), Thụy Sĩ (4 vùng ở Alps), và Georgia (Lagodekhi). Dữ liệu thời gian kéo dài từ 10–16 năm, tất cả đều kết thúc vào năm 2007. Chúng tôi tính toán mối tương quan giữa dữ liệu phấn hoa và khí hậu. Dữ liệu phấn hoa là PAR được tổng hợp theo từng vùng (4–7 bẫy được lựa chọn mỗi vùng) cho mỗi loại phấn hoa (9–14 mỗi vùng) sử dụng trung vị log biến đổi và đã loại bỏ xu hướng. Dữ liệu khí hậu là nhiệt độ và lượng mưa hàng tháng được đo tại các trạm gần đó, và trung bình của chúng qua tất cả các khoảng thời gian 2 đến 6 tháng có thể xảy ra trong khoảng thời gian 20 tháng kết thúc vào tháng Tám, ngay trước khi thu thập phấn hoa hàng năm. Phần lớn các mối quan hệ giữa PAR và khí hậu đã được phát hiện có sự khác biệt cả giữa các loại phấn hoa và giữa các vùng, điều này có thể do sự khác biệt giữa các vùng nghiên cứu trong môi trường sống của các quần thể thực vật. Kết quả chung mà nhiều vùng chia sẻ có thể được tóm tắt như sau. Nhiệt độ ấm vào mùa hè được phát hiện làm tăng PAR của Picea, Pinus không-cembra, Larix và Fagus vào năm tiếp theo. Ngược lại, mùa hè mát mẻ làm gia tăng PAR của Abies, Alnus viridis và Gramineae trong năm tiếp theo, trong khi mùa hè ẩm ướt thúc đẩy PAR của Quercus và Gramineae. Độ ẩm và ấm áp nói chung được phát hiện làm tăng PAR của Salix. Lượng mưa được cho là quan trọng hơn đối với PAR của loại Alnus glutinosa so với nhiệt độ. Thời tiết không có tác động đến PAR của Gramineae, và có thể cả của Cyperaceae trong cùng năm. Cần thận trọng khi suy luận kết quả của chúng tôi sang PAR trong các chuỗi phấn hoa, bởi vì có những sai số lớn liên quan đến PAR từ trầm tích, do ảnh hưởng của taphonomy và quá trình lắng đọng cũng như độ không chắc chắn cao trong việc xác định niên đại. Hơn nữa, trong các chuỗi phấn hoa có độ phân giải từ hàng thập kỷ đến thế kỷ thay vì gần hàng năm, các hiệu ứng tương tác cây trồng có thể dễ dàng vượt qua tín hiệu thời tiết.
Từ khóa
#phấn hoa #độ tích lũy phấn hoa #khí hậu #môi trường thực vật #Ba Lan #Cộng hòa Séc #Thụy Sĩ #Georgia #nghiên cứu sinh tháiTài liệu tham khảo
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