Sự khác biệt về chất hữu cơ trong đất, dinh dưỡng có thể chiết xuất và độ axit trong đất ở rừng beech châu Âu (Fagus sylvatica L.) liên quan đến sự hiện diện của thảm thực vật dưới

Informa UK Limited - Tập 17 - Trang 333-342 - 2011
Frida Andreasson1,2, Anna-Maj Balsberg Påhlsson1, Bo Bergkvist1
1Section of Plant Ecology and Systematics, Department of Ecology, Lund University, Lund, Sweden
2Laboratory of Forest Utilization, Department of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Kyoto, Japan

Tóm tắt

Các sự khác biệt về hàm lượng chất hữu cơ trong đất (SOM), độ axit của đất và các dinh dưỡng có thể trao đổi trong đất (NH4–N, NO3–N, Ca, K, Na, Mg) có liên quan đến sự hiện diện của thảm thực vật dưới đã được nghiên cứu. Nghiên cứu được tiến hành trong một mùa sinh trưởng tại hai rừng Fagus sylvatica L. khác nhau ở miền Nam Thụy Điển, và các khác biệt về đặc điểm đất dưới các mảng Deschampsia flexuosa (L.) Trin. hoặc Anemone nemorosa L. xảy ra tự nhiên đã được so sánh với các vùng không có thảm thực vật dưới. Các mảng D. flexuosa dẫn đến pH đất cao hơn, nhưng hàm lượng SOM, độ ẩm, độ bão hòa cơ sở và nồng độ NH4–N thấp hơn so với các vùng lân cận không có D. flexuosa. Hàm lượng SOM thấp hơn cho thấy tốc độ phân hủy tăng, gây ra sự gia tăng pH đất do sự giải phóng các cation kiềm. Trong sự hiện diện của A. nemorosa, pH cao hơn và độ axit trao đổi thấp hơn so với các mảng không có thảo dược. Vào đầu mùa xuân, khi A. nemorosa xuất hiện và ra hoa, nồng độ NH4–N ở sự hiện diện của thảo dược thấp hơn một chút so với khi không có. Đối với cỏ thường xanh D. flexuosa, nồng độ NH4–N thấp hơn trong các mảng có cỏ vào cuối mùa hè (tháng Bảy). Công trình này chỉ ra sự hiện diện của các sự khác biệt không gian và thời gian trong việc lưu thông dinh dưỡng và sự phân hủy ở quy mô thảm thực vật dưới nhỏ, điều này cần được xem xét trong khi nghiên cứu chu trình dinh dưỡng và cacbon của các khu rừng ôn đới.

Từ khóa

#chất hữu cơ trong đất #độ axit đất #dinh dưỡng có thể trao đổi #thảm thực vật dưới #rừng beech châu Âu

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