Ảnh hưởng của tốc độ tăng trưởng đến góc vi sợi trung bình và hình dạng mặt cắt ngang của các tế bào dẫn của thông Norway

Trees - Tập 18 - Trang 354-362 - 2004
Matti-P. Sarén1, Ritva Serimaa1, Seppo Andersson1, Pekka Saranpää2, Jozef Keckes3, Peter Fratzl3
1Division of X-ray Physics, Department of Physical Sciences, University of Helsinki, Helsinki, Finland
2Finnish Forest Research Institute, Vantaa, Finland
3Erich-Schmid-Institute of Material Science, Leoben, Austria

Tóm tắt

Sự biến thiên của góc vi sợi trung bình (MFA) và hình dạng mặt cắt ngang của lòng ống theo khoảng cách từ lõi trong thông Norway tăng trưởng nhanh đã được nghiên cứu bằng phương pháp tán xạ tia X và kính hiển vi quang học. Các mẫu được lấy từ thân của một giống thông Norway [Picea abies (L.) Karst.] được trồng tại một khu đất màu mỡ ở Nurmijärvi, miền nam Phần Lan. Cả góc MFA trung bình và chỉ số hình tròn của lòng ống của những cây tăng trưởng nhanh đều giảm một cách dần dần hơn khi khoảng cách từ lõi tăng lên so với những cây tham chiếu trồng trong khu vực đất màu trung bình. Tuy nhiên, trong gỗ trưởng thành, góc MFA trung bình đạt đến mức giống như cây tham chiếu (5°-10°) nhưng mặt cắt ngang của các tế bào vẫn duy trì hình dạng hình tròn hơn trong những cây tăng trưởng nhanh so với những cây tham chiếu. Sự phụ thuộc của góc MFA trung bình vào khoảng cách từ lõi tương tự cho gỗ đầu mùa và gỗ cuối mùa, nhưng các giá trị của góc MFA trung bình của gỗ cuối mùa thì nhỏ hơn một cách có hệ thống so với gỗ đầu mùa. Hai hình học tán xạ tia X khác nhau đã được so sánh từ các khía cạnh sinh học và phân tích dữ liệu.

Từ khóa

#góc vi sợi trung bình #mặt cắt ngang #thông Norway #tốc độ tăng trưởng #phân tích dữ liệu

Tài liệu tham khảo

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