Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Sự thay đổi lượng mưa và sự ăn tàn bộ rễ ảnh hưởng đến năng suất và cấu trúc của một đồng cỏ ẩm ướt
Tóm tắt
Các mô hình biến đổi khí hậu dự đoán sự thay đổi về lượng, tần suất và mùa vụ của các sự kiện mưa, tất cả đều có khả năng ảnh hưởng đến cấu trúc và chức năng của các hệ sinh thái đồng cỏ. Trong khi các nghiên cứu trước đây đã xem xét phản ứng của thực vật hoặc động vật ăn cỏ đối với những biến động này, thì rất ít nghiên cứu đã xem xét các tương tác giữa chúng; còn ít hơn nữa khi bao gồm các động vật ăn cỏ dưới mặt đất. Với giá trị sinh thái, kinh tế và đa dạng sinh học của đồng cỏ, cùng tầm quan trọng toàn cầu của chúng đối với lưu trữ carbon và nông nghiệp, đây là một khoảng trống kiến thức quan trọng. Để giải quyết vấn đề này, chúng tôi đã tiến hành một thí nghiệm điều chỉnh lượng mưa trong một đồng cỏ ẩm ướt trước đây bao gồm một hỗn hợp các loại cỏ C4 và C3 cùng với các loại thảo mộc, ở đông nam Úc. Các phương pháp xử lý lượng mưa bao gồm một nhóm đối chứng [môi trường], giảm lượng [50% môi trường] và giảm tần suất [mưa môi trường bị ngừng trong ba tuần, sau đó được áp dụng dưới dạng một sự kiện mưa lớn duy nhất] để mô phỏng các thay đổi dự đoán trong cả kích thước và tần suất của các sự kiện mưa trong tương lai. Ngoài ra, một nửa các ô thí nghiệm đều được tiêm nhiễm với các động vật ăn cỏ trưởng thành dưới mặt đất (bọ Scarabaeidae). Chúng tôi nhận thấy sự phụ thuộc mùa mạnh trong các phản ứng của cộng đồng thực vật đối với cả điều trị mưa và động vật ăn cỏ bộ rễ. Các tác động lớn nhất xuất hiện trong mùa mát với năng suất, độ che phủ và đa dạng giảm ở các ô điều chỉnh lượng mưa, trong khi việc tiêm nhiễm động vật ăn cỏ bộ rễ làm tăng độ phong phú tương đối của thực vật C3, so với thực vật C4. Nghiên cứu này nhấn mạnh tầm quan trọng của việc không chỉ xem xét mùa vụ của phản ứng thực vật đối với lượng mưa bị thay đổi, mà còn vai trò quan trọng của các tương tác giữa các yếu tố vô sinh và hữu sinh trong sự thay đổi thực vật khi đánh giá phản ứng ở cấp độ hệ sinh thái đối với các biến đổi khí hậu trong tương lai.
Từ khóa
#biến đổi khí hậu #đồng cỏ ẩm ướt #lượng mưa #động vật ăn cỏ dưới mặt đất #đa dạng sinh học #sản xuất sinh họcTài liệu tham khảo
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