Biochar impacts on phosphorus cycling in rice ecosystem.
Biochar impacts on phosphorus cycling in rice ecosystem.
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DOI：
10.1016/j.chemosphere.2019.03.069
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发表时间：
2019-06
期刊：
影响因子：
8.8
通讯作者：
Min Xu;Peng Gao;Zhijun Yang;Linlin Su;Jun Wu;Gang Yang;Xiaohong Zhang;Jing Ma;Hong Peng;Yin-long Xiao
中科院分区：
文献类型：
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作者：
Min Xu;Peng Gao;Zhijun Yang;Linlin Su;Jun Wu;Gang Yang;Xiaohong Zhang;Jing Ma;Hong Peng;Yin-long Xiao
生物质炭可以通过多种途径影响水稻生态系统中的磷循环。采用盆栽试验研究了玉米秸秆生物炭与磷肥配施对土壤磷污染的风险及对作物的供磷率。在低磷和高磷土壤中，生物炭分别使土壤全磷含量增加了18.3%和8.45%。在低磷水平下，生物炭的加入使磷活化系数（PAC）提高了9.00%，而在高磷水平下，PAC降低了10.4%。结果表明，生物炭既可以作为磷的源，也可以作为磷的汇。在低磷和高磷水平下，生物炭处理土壤根表连二亚硫酸盐-柠檬酸盐-碳酸氢盐（DCB）浸提液中的磷浓度分别增加了467.1%和46.1%。这可能是由于根际土壤酸化和铁膜增加所致。结果还表明，生物炭的添加增加了水稻的DCB-P浓度，从而促进了水稻的生长。生物炭的添加提高了细菌群落的丰富度和多样性，而添加剂则抑制了细菌的生长。土壤微生物群落组成与土壤速效氮、Fe-P、Ca-P、P吸收量和DCB提取的Fe（DCB Fe）呈显著正相关，分别解释了土壤微生物群落总变异的46.8%、37.1%、38.0%、37.5%和36.7%。研究结果表明，生物炭可能通过影响水稻生态系统中微生物群落组成和铁还原过程来影响水稻磷循环。
Biochar can affect the phosphorus (P) cycle in the rice ecosystem through various pathways. Pot experiments were conducted to investigate the risk of P contamination and the P supply rate to crops with the application of maize straw-derived biochar (BM) and P fertilizer. The biochar increased 18.3% and 8.45% total phosphorus (TP) concentration in the low-P level and high-P level soils, respectively. The addition of biochar increased the phosphorus activation coefficient (PAC) by 9.00% at low-P levels, while the PAC was reduced by 10.4% at high-P levels. The results suggested that biochar could serve as either a source or a sink for P. The P concentration in the dithionite-citrate-bicarbonate (DCB) extracts on the root surfaces in biochar-treated soils increased by 467.1% and 46.1% in the low-P level and high-P level soils, respectively. It may cause by the acidification of soils near the root and the increase in Fe plaque. The results also showed the addition of biochar increased the DCB-P concentration and subsequently promoted rice growth. The biochar additions enhanced bacterial community richness and diversity, while the P supplementations inhibited bacterial growth. Redundancy analysis (RDA) showed that available nitrogen (AN), Fe-P, Ca-P, P uptake and, DCB extracted Fe (DCB-Fe) were significantly correlated with microbial community composition and explained 46.8%, 37.1%, 38.0%, 37.5% and 36.7% of the total community variability, respectively. This study provided evidence that biochar might affect the P cycle by impacting the microbial community composition and the Fe-reducing processes in the rice ecosystem.