Effect of the black soldier fly larvae composting efficiency and carbon-nitrogen fixation by in-situ regulation of carbon source composition
YAN Ye-hao1,2, LIN Jia-cong2,3, MAI Li-wen2,3, ZHU Si-xi1, LI Qin-fen2,3, WANG Ding-mei2,3
1. School of Ecological Environment Engineering, Guizhou Minzu University, Guiyang 550025, China; 2. Institute of Environment and Plant Protection, Chinese Academy of Tropical Agricultural Sciences, Key Laboratory of Low-carbon Green Agriculture in Tropical Region of China, Ministry of Agriculture and Rural Affairs, P. R. China, Hainan Provincial Key Laboratory of Tropical Ecological Circular Agriculture, Haikou 571101, China; 3. Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, National Agricultural Experimental Station for Agricultural Environment, National Long-term Experimental Station for Agriculture Green Development, Danzhou 571737, China
Abstract：The glucose and rubber sawdust which is considered as high bioavailable and low bioavailable material, respectively, was set as carbon source. And the peanuts meal was used as the nitrogen source in the BSFL composting. 25composting treatments with C/N of 10、15、20、25、30, and the ratio of available carbon component in 0%、25%、50%、75%、100%. Orthogonal partial least squares regression and relevance analysis were used to determine the key indices of composting and C-N fixation effect. BSFL composting effect between different treatments were comprehensively evaluated by principal component analysis. The results indicated that productivity of the larva and larva-cast were 3.96% ~23.06% and 13.38% ~89.99%, respectively. The content of C and N in larva of was 48.12% ~60.31% and 5.79% ~9.85%, respectively, of which 3.24% ~29.58% and 17.21% ~52.69% were recovered from the composting substrate, respectively. The total C and N fixation rates in BSLF composting were 40.69%~93.81% and 38.06% ~72.89%, respectively. The proportion of carbon availability and active nitrogen components exhibits a significant effect on the C-N conversion rate of larva and larva cast (VIP > 1). The ACC1(Available Activity Carbon 1) content and proportion should be more focus on in practical BSFL composting. The best comprehensive effect larva quality and C-N fixation were obtained in the total C/N of 10with the ratio of available to unavailable carbon component in 1: 1. It is insufficient to conduct the BSFL composting only relying on substrate C/N without considering their availability. This study is significant for providing an efficient in-suit method in accurately regulating the bioavailability of the carbon source of the substrate, and finally result in enhancement of larva conversion efficiency and the C-N fixation.
严业皓, 林嘉聪, 麦力文, 朱四喜, 李勤奋, 王定美. 原位调控基料碳源组分对水虻堆肥效率与碳氮固定效应的影响[J]. 中国环境科学, 2023, 43(6): 2970-2981.
YAN Ye-hao, LIN Jia-cong, MAI Li-wen, ZHU Si-xi, LI Qin-fen, WANG Ding-mei. Effect of the black soldier fly larvae composting efficiency and carbon-nitrogen fixation by in-situ regulation of carbon source composition. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2970-2981.
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