Microalgae-derived hydrochar application on rice paddy soil: Higher rice yield but increased gaseous nitrogen loss
Microalgae-derived hydrochar application on rice paddy soil: Higher rice yield but increased gaseous nitrogen loss
复制标题
微藻水炭在稻田土壤上的应用：水稻产量更高，但气态氮损失增加
DOI：
10.1016/j.scitotenv.2020.137127
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发表时间：
2020-05-15
影响因子：
9.8
通讯作者：
Yang, Linzhang
中科院分区：
文献类型：
--
作者：
Chu, Qingnan;Xue, Lihong;Yang, Linzhang
水热碳化是一种将微藻转化为具有丰富植物有效营养的氢焦的很有前途的技术。然而，微藻来源的水合物对农田气态氮(N)流失的影响尚不清楚。以水(CVHW)或柠檬酸溶液(CVHCA)为反应介质，将普通小球藻粉末(CVP)和两种普通小球藻衍生的氢化物(CVP)应用于水稻土柱系统。在整个水稻生长季节内，监测了氮氧化物(N2O)排放和氨(NH3)挥发的时间变化。结果表明，与对照和CVP组相比，添加CVHW和CVHCA显著提高了水稻产量(分别增加13.5-26.8%和10.5-23A%)，同时增加了水稻土氨挥发量(分别增加了53.8%和72.9%)和N2O排放量(分别是对照的2.17倍和2.82倍)。土壤微生物功能基因(AOA、AOB、NIRK、NIRS、nosZ)表明，CVHW和CVHCA处理促进了土壤的硝化反硝化，抑制了土壤中N2O的氧化。值得注意的是，从提高产量和控制NH3挥发的角度来看，CVHW是值得推荐的，因为对照和CVHW处理对应的NH3挥发没有显著差异。本研究首次发现小球藻提取的氢炭对水稻氮素利用和生长有积极的影响，但对大气环境有负面影响。(C)2020爱思唯尔B.V.保留所有权利。
Hydrothermal carbonization represents a promising technique for transforming microalgae into the hydrochar with abundant phytoavailable nutrients. However, the effects of microalgae-derived hydrochars on the gaseous nitrogen (N) loss from agricultural field are still unclear. Chlorella vulgaris powder (CVP) and two Chlorella vulgaris-derived hydrochars that employ water (CVHW) or citrate acid solution (CVHCA) as the reaction medium were applied to a soil column system grown with rice. The temporal variations of nitrous oxide (N2O) emissions and ammonia (NH3) volatilization were monitored during the whole rice-growing season. Results showed that CVHW and CVHCA addition significantly increased the grain yield (by 13.5-26.8% and 10.5-23A%) compared with control and CVP group, while concomitantly increasing the ammonia volatilization (by 53.8% and 72.9%) as well as N2O emissions (by 2.17- and 2.82-fold) from paddy soil compared to control. The microbial functional genes (AOA, AOB, nirk, nirS, nosZ) in soil indicated that CVHW and CVHCA treatment stimulated the nitrification and deni tri ficat ion, and inhibited the N2O oxidation in soil. Notably, CVHW was recommended in the view of improving yield and controlling NH3 volatilization because no significant difference of the yield-scale NH3 Corresponding volatilization was detected between control and CVHW treatment. This study for the first time uncovered that Chlorella vulgaris-derived hydrochars have positive effects on rice N utilization and growth but negative effects on the atmospheric environment. (C) 2020 Elsevier B.V. All rights reserved.