气候变化领域集成服务门户(CCPortal): Long-term effects of biochar application on biological nitrogen fixation of acacia species and soil carbon and nitrogen pools in an Australian subtropical native forest

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DOI	10.1007/s11368-024-03816-8
	Long-term effects of biochar application on biological nitrogen fixation of acacia species and soil carbon and nitrogen pools in an Australian subtropical native forest
	Li, Yinan; Sun, Weiling; Xu, Zhihong; Bai, Yifan; Bai, Shahla Hosseini
发表日期	2024
ISSN	1439-0108
EISSN	1614-7480
英文摘要	Purpose Biological nitrogen (N) fixation (BNF) of understory acacia species presents a potential way for effectively restoring N in forest systems. This study aimed to quantify the impact of acacia species and biochar application rates on BNF and soil mineral N in a suburban native forest of subtropical Australia in the first 4-5 years after prescribed burning. Method Plant growth values and BNF were measured to assess the impact of biochar rates at 0, 5, and 10 t ha(-1) on different acacia species. Soil NH4+-N and NO3--N along with their N isotope composition (delta N-15) were determined to investigate soil-plant interactions in response to acacia species and biochar application. Results The application of 10 t ha(-1) biochar significantly enhanced the growth of acacia species, and concurrently reduced the loss of NO3--N at soil depths of 0-5 and 5-10 cm. Compared with Acacia disparimma (percentage of N derived from the atmosphere or %Ndfa: 78.2%), A. leiocalyx demonstrated significant higher BNF ability (%Ndfa: 91.3%). Similarly, A. leiocalyx had better growth, in terms of height (269.1 cm versus 179.6 cm), diameter at ground level (2.62 cm versus 1.94 cm), basal area (6.49 cm(2) versus 3.43 cm(2)) and volume (692.2 cm(3) versus 258.0 cm(3)). This was associated with its ability to promote organic matter mineralization, resulting in the accumulation of N-15-depleted NH4+-N. NH4+-N, acting as a substrate, was transformed into NO3--N through nitrification. From regression analysis, the efficient absorption of NH4+-N by A. leiocalyx significantly mitigated NH4+-N leaching with increasing soil moisture concentration (SMC), resulting in lower delta N-15 of NH4+-N, which was more negatively related to SMC (R-2 = 0.401), compared to that of A. disparimma (R-2 = 0.250) at soil depth of 0-5 cm. The production of NO3--N was reduced, leading to lower NO3--N concentrations of A. leiocalyx than A. disparimma at soil depth of 0-5 cm (8.06 mu g N g(-1) versus 9.61 mu g N g(-1)) and that of 5-10 cm (8.24 mu g N g(-1) versus 9.21 mu g N g(-1)) respectively. Conclusions As an effective soil amendment, biochar exhibited promise in reducing mineral N loss and stimulating plant growth in long-term applications of exceeding three years. Higher BNF capacity and greater plant growth were observed with A. leiocalyx, compared with those of A. disparimma. The retention and utilisation of mineral N by A. leiocalyx can be considered as strategy to restore forest soils.
英文关键词	N deposition; Mineral nitrogen; delta N-15; BNF; SMC; Biochar
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
WOS类目	Environmental Sciences ; Soil Science
WOS记录号	WOS:001223784400001
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306480
作者单位	Griffith University
推荐引用方式 GB/T 7714	Li, Yinan,Sun, Weiling,Xu, Zhihong,et al. Long-term effects of biochar application on biological nitrogen fixation of acacia species and soil carbon and nitrogen pools in an Australian subtropical native forest[J],2024.
APA	Li, Yinan,Sun, Weiling,Xu, Zhihong,Bai, Yifan,&Bai, Shahla Hosseini.(2024).Long-term effects of biochar application on biological nitrogen fixation of acacia species and soil carbon and nitrogen pools in an Australian subtropical native forest.JOURNAL OF SOILS AND SEDIMENTS.
MLA	Li, Yinan,et al."Long-term effects of biochar application on biological nitrogen fixation of acacia species and soil carbon and nitrogen pools in an Australian subtropical native forest".JOURNAL OF SOILS AND SEDIMENTS (2024).