Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Ảnh hưởng của phân compost và độ ẩm đất đến động lực carbon và nitrogen theo mùa, khí thải khí nhà kính và tiềm năng nóng lên toàn cầu của đất bán khô
Tóm tắt
Nghiên cứu ấp ủ trong 8 tuần đã được thực hiện để theo dõi nitrogen vô cơ (N) trong đất, carbon hữu cơ hòa tan (DOC), khí nhà kính (GHG) [CO2, N2O và CH4] và tiềm năng nóng lên toàn cầu (GWP) trong đất khô. Đất đã được cải tạo với các tỷ lệ phân compost khác nhau (không, 15, 30 và 45 Mg khô ha−1) và độ ẩm đất [5% (khô), 7% (bình thường) và 14% (ướt) không gian lỗ chứa nước (WFPS)] và đã trải qua các chuyển tiếp nhiệt độ hai tuần một lần từ 5 °C (cuối mùa đông) đến 10 °C (đầu mùa xuân) đến 15 °C (cuối mùa xuân) đến 25 °C (đầu mùa hè). Việc bổ sung 30 và 45 Mg ha−1 phân compost đã tăng cường sự khoáng hóa N với 13% nitrogen vô cơ trong đất cao hơn (7.49 và 7.72 µg Ng−1 ngày−1, tương ứng) trong giai đoạn đầu mùa hè so với các tỷ lệ phân compost thấp hơn. Đất bình thường và ướt có 35% DOC nhiều hơn vào cuối mùa xuân (trung bình 34 µg g−1 ngày−1) so với WFPS khô, nhưng việc chuyển từ cuối mùa xuân sang đầu mùa hè, DOC ở tất cả các mức độ WFPS trong đất đều tăng lên. Tỷ lệ phân compost cao nhất không phải là nguồn khí GHG đáng kể với WFPS bình thường, so với các tỷ lệ phân compost thấp hơn. Khí thải carbon dioxide tăng 59 và 15%, tương ứng, khi WFPS của đất tăng từ khô đến bình thường và từ bình thường đến ướt. Đất có WFPS bình thường là nơi hấp thụ CH4 hiệu quả nhất. Việc áp dụng một lần các tỷ lệ phân compost cao cho đất khô dẫn đến việc tăng cường khoáng hóa N và C dưới độ ẩm đất bình thường và nhiệt độ cao hơn vào mùa hè nhưng sẽ không gây ra nguy cơ nóng lên toàn cầu đáng kể cho môi trường thông qua khí thải GHG vì đất hiếm khi ướt.
Từ khóa
#phân compost #độ ẩm đất #khí nhà kính #nitrogen #carbon #nóng lên toàn cầuTài liệu tham khảo
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