Ảnh hưởng của hóa học, sản lượng và thành phần cộng đồng đối với sự phân hủy lá thải dưới điều kiện CO2 khí quyển tăng cao và O3 tầng đối lưu trong hệ sinh thái gỗ cứng vùng Bắc

Springer Science and Business Media LLC - Tập 12 - Trang 401-416 - 2009
Lingli Liu1,2, John S. King1, Christian P. Giardina3, Fitzgerald L. Booker4
1Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, USA
2Environmental Media Assessment Group—MD B243-01, National Center for Environmental Assessment, Office of Research and Development, U.S. EPA, North Carolina, USA
3Institute of Pacific Islands Forestry, USDA Forest Service—PSW Research Station, Hilo, USA
4United States Department of Agriculture, Agricultural Research Service, Plant Science Research Unit, Raleigh, USA

Tóm tắt

Chúng tôi đã nghiên cứu ảnh hưởng của CO2 và O3 tăng cao cùng với sự tương tác của chúng đến hóa học lá thải và sự phân hủy trong các quần xã thuần chủng của aspen (Populus tremuloides) và các quần xã hỗn hợp của bạch dương (Betula papyrifera) và aspen tại thí nghiệm Tăng cường CO2 trong không khí tự do ở Aspen (FACE). Một nghiên cứu ấp ủ tại chỗ kéo dài 935 ngày đã được thực hiện sử dụng túi lá thải được lấp đầy bằng lá thải tự nhiên đã héo. Chúng tôi phát hiện ra rằng CO2 tăng cao không có ảnh hưởng tổng thể đến tỷ lệ phân hủy lá thải, trong khi O3 tăng cao làm giảm mất khối lượng lá thải (−13%) trong năm đầu tiên. Ảnh hưởng của O3 đối với mất khối lượng biến mất trong năm thứ hai. Đối với lá thải aspen nhưng không phải lá thải hỗn hợp bạch dương-aspen, tỷ lệ phân hủy có mối tương quan tiêu cực với nồng độ ban đầu của tannin ngưng tụ và phenolic. Hầu hết các thành phần hòa tan (94% đường hòa tan, 99% tannin ngưng tụ và 91% phenolic hòa tan) và bất kỳ ảnh hưởng điều trị nào đến nồng độ ban đầu của chúng biến mất nhanh chóng. Tuy nhiên, thời gian cư trú trung bình (MRT) của lá thải bạch dương-aspen (3.1 năm) thấp hơn đáng kể so với lá thải aspen (4.8 năm). Hơn nữa, do sự biến động trong tổng lượng lá thải, khối lượng lá thải tổng thể, C, lignin và N còn lại trong hệ sinh thái cao nhất dưới CO2 tăng cao và thấp nhất dưới O3 tăng cao trong suốt thời gian ấp ủ. Kết quả của chúng tôi chỉ ra rằng CO2 và O3 tăng cao có thể làm thay đổi động lực phân hủy lá thải trong ngắn hạn, nhưng tác động dài hạn sẽ phụ thuộc nhiều hơn vào những ảnh hưởng gián tiếp do sự thay đổi trong thành phần cộng đồng rừng.

Từ khóa

#CO2 tăng cao #O3 tầng đối lưu #phân hủy lá thải #hệ sinh thái gỗ cứng #tannin ngưng tụ #phenolic

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