Soil nitrification and nitrogen mineralization responded non-linearly to the addition of wood biochar produced under different pyrolysis temperatures

被引:8
作者
Nessa, Ashrafun [1 ]
Bai, Shahla Hosseini [1 ]
Wang, Dianjie [1 ]
Karim, Zakaria [1 ]
Omidvar, Negar [1 ]
Zhan, Juan [1 ]
Xu, Zhihong [1 ]
机构
[1] Griffith Univ, Sch Environm & Sci, Ctr Planetary Hlth & Food Secur, Nathan, Qld 4111, Australia
关键词
Biochar; Pyrolysis temperature; Nitrification; Nitrogen mineralization; Forest soil; ADJACENT NATURAL FOREST; HOOP PINE PLANTATIONS; LONG-TERM; CHEMICAL-PROPERTIES; AMMONIA-OXIDIZERS; ORGANIC-CARBON; DYNAMICS; NITRATE; POOLS; N-15;
D O I
10.1007/s11368-021-03077-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Purpose Nitrogen (N) cycle is one of the key biogeochemical cycles in terrestrial ecosystems. Global climate change and soil management practices have disrupted the soil N cycling processes due to increased water and N limitations. Biochar is a soil amendment and improves soil-plant water and N retentions. However, it is uncertain to what extent biochar pyrolysis temperature would affect soil N transformations under two soil moisture regimes. This study aimed to explore how pyrolysis temperature would affect biochar properties and subsequently soil N transformations through a short-term laboratory incubation study at two moisture levels. Materials and methods An incubation study was carried out for 5 days. Biochar added to the soil at a rate of 5% (w/w) was produced under six different pyrolysis temperatures (e.g., 500, 600, 650, 700, 750, and 850 degrees C). We used N-15 natural abundance (delta N-15) of inorganic N (NH4+-N and NO3--N) to assess the potential of biochar materials in facilitating forest soil N transformations at two different soil moisture levels of 50% and 65% water holding capacity (WHC). Results and discussion Pyrolysis temperature significantly increased cumulative nitrification and N mineralization initially, peaked between 600 and 700 degrees C and decreased thereafter. However, both cumulative nitrification and N mineralization were significantly lower in the biochar-amended soils than those of the control soil, with significantly lower delta N-15 of NH4+-N and delta N-15 of NO3--N. The 65% WHC had higher cumulative nitrification and N mineralization compared with those in 50% WHC. This study highlights that application of biochar would reduce N losses and improve soil N retention particularly for forest soil. Conclusions The present study highlights the importance of biochar pyrolysis temperatures for their use as soil conditioner to increase soil N retention. An optimum pyrolysis temperature range of 600-700 degrees C was identified for improving soil nitrification and N mineralization under the laboratory incubation conditions.
引用
收藏
页码:3813 / 3824
页数:12
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