Ảnh hưởng của các loài cây đến sự tích lũy và phân bố chất thải vi sinh trong các khối đất tại các đồn điền cận nhiệt đới ở Trung Quốc

Ecological Processes - Tập 12 Số 1
Yuanyuan Jing1,2, Xuechao Zhao2,3, Shengen Liu4, Peng Tian5, Zhaolin Sun5, Longchi Chen2, Qingkui Wang2
1Ecology Security and Protection Key Laboratory of Sichuan Province, Mianyang Teachers’ College, Mianyang, China
2Huitong Experimental Station of Forest Ecology, CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, China
3University of Chinese Academy of Sciences, Beijing, China
4College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, China
5School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, China

Tóm tắt

Tóm tắt Bối cảnh Chất thải vi sinh đóng vai trò quan trọng trong việc đóng góp cho carbon hữu cơ trong đất (SOC) ổn định. Các khối đất có khả năng bảo vệ hiệu quả các chất thải vi sinh khỏi sự phân hủy; do đó, sự tích lũy và phân bố của chất thải vi sinh giữa các khối đất quyết định sự ổn định SOC lâu dài. Tuy nhiên, cách các loài cây ảnh hưởng đến sự tích lũy và phân bố chất thải vi sinh trong đất vẫn chưa được biết đến nhiều, điều này làm hạn chế khả năng phát triển chính sách quản lý SOC. Ở đây, chúng tôi đã nghiên cứu sự tích lũy và phân bố chất thải vi sinh trong các khối đất dưới bốn loài cây cận nhiệt đới ( Cunninghamia lanceolata , Pinus massoniana , Michelia macclurei , và Schima superba ) sau 29 năm trồng rừng. Kết quả Sự tích lũy chất thải vi sinh trong lớp đất 0–10 cm cao hơn từ 13.8–26.7% dưới S. superba so với các loài cây khác. Một mô hình phương trình cấu trúc cho thấy các loài cây ảnh hưởng trực tiếp đến sự tích lũy chất thải vi sinh bằng cách thay đổi sinh khối nấm. Thêm vào đó, các loài cây ảnh hưởng đáng kể đến sự phân bố và đóng góp của chất thải vi sinh vào SOC trong 20 cm đất đầu. Cụ thể, sự phân bố của chất thải vi sinh giảm từ 17.2–33.4% trong các khối vi mô lớn (LMA) nhưng tăng 60.1–140.7% trong các khối vi mô (MA) dưới S. superba so với các loài khác trong lớp đất 0–10 cm, và giảm 14.3–19.0% trong LMA nhưng tăng 43–52.1% trong MA dưới S. superba so với C. lanceolata và M. macclurei trong lớp đất 10–20 cm. Hơn nữa, sự đóng góp của chất thải vi sinh vào SOC cao hơn từ 44.4–47.5% dưới S. superba so với các loài cây khác. Những phát hiện này cho thấy tính ổn định cao hơn của chất thải vi sinh dưới S. superba so với các loài cây khác được nghiên cứu. Kết luận Kết quả của chúng tôi cho thấy các loài cây ảnh hưởng đến sự tồn tại lâu dài của vi sinh trong đất rừng bằng cách tác động đến sự tích lũy và ổn định của chất thải vi sinh.

Từ khóa

#Chất thải vi sinh; carbon hữu cơ trong đất; sự tích lũy và phân bố; cây cận nhiệt đới; trồng rừng.

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Ecological Processes

Tập 12 Số 1

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