Livestock manure-derived hydrochar improved rice paddy soil nutrients as a cleaner soil conditioner in contrast to raw material
Livestock manure-derived hydrochar improved rice paddy soil nutrients as a cleaner soil conditioner in contrast to raw material
复制标题
与原材料相比，畜禽粪便水力炭作为更清洁的土壤改良剂改善了稻田土壤养分
DOI：
10.1016/j.jclepro.2022.133798
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发表时间：
2022-09-02
影响因子：
11.1
通讯作者：
Xue, Lihong
中科院分区：
文献类型：
--
作者：
Ding, Shudong;Wang, Bingyu;Xue, Lihong
水热碳化法具有高效、节能、不脱水等优点，是一种很有前途的畜禽粪便资源化处理技术。以往的研究主要集中在畜禽粪便水热炭的表征及其在各个领域的应用。然而，LMH作为土壤改良剂对农业土壤养分，溶解性有机质（DOM）的变化和作物产量的影响尚未明确。对影响LMH还田后水稻产量的主要因素也很少提及。采用土柱试验研究了在减少无机肥施用量的前提下，牛粪（CM）和牛粪水热炭（CC 180和CC 260）还田后土壤基本性状、DOM和水稻产量的变化。结果表明，与CM相比，CCs能部分提高土壤养分含量，其中全磷、有机碳和溶解性有机碳分别提高6.8-18.9%、8.2%和18.7%。土壤铵态氮和硝态氮含量分别比对照降低5.8-9.9%和4.7-15.8%。LMH通过增加土壤中钙结合态磷的含量，提高了磷的稳定性。三维荧光光谱表明土壤DOM中含有类胡敏酸物质（C1和C2）和类酪氨酸物质（C4）。LMH处理土壤DOM中3种物质的含量比CM处理高15.8 ~ 85%。此外，红外光谱和二维相关分析揭示了土壤DOM中功能基团的结构和演变，说明高温可增加土壤DOM中疏水性和饱和性物质。此外，水稻产量的提高，CC比CM高19.9- 36.9%。结果表明，LMH作为土壤改良剂替代部分化肥比CM更有利于农业土壤。
Hydrothermal carbonization (HTC) is a promising technology for resource disposal of livestock manure due to its advantages of high efficiency, low-energy consumption and no dehydration. Previous studies most focused on the characterization and applications in various fields of livestock manure-derived hydrochar (LMH). However, the effects of LMH as soil conditioner on agricultural soil nutrients, dissolved organic matter (DOM) changes and crop yields have not been clarified. The major factors affecting the rice yield of LMH after returning to the field are also seldom mentioned. In this study, a soil column experiment was conducted to explore the changes in soil basic characteristics, DOM and rice yield after returning cattle manure (CM) and cattle manure-derived hydrochar (CC180 and CC260) to the field on the premise of reducing inorganic fertilizer application. The results showed that CCs increased soil nutrient partly, including total phosphorus (by 6.8-18.9%), soil organic carbon (by 8.2%) and dissolved organic carbon (by 18.7%) compared to CM. Soil ammonium nitrogen and nitrate nitrogen concentrations of CCs decreased by 5.8-9.9% and 4.7-15.8% in comparison with CM. LMH increased the stability of phosphorus by increasing the content of calcium bound phosphorus in soil. Threedimensional fluorescence spectra expressed that soil DOM contained humic-like acid substances (C1 and C2) and tyrosine-like substances (C4). The three substances contents in soil DOM under LMH treatment were higher than that of CM by 15.8-85%. In addition, infrared spectra and two-dimensional correlation analysis showed the structure and evolution of functional groups in soil DOM, which indicated that high temperature could increase the hydrophobic and saturated substances in soil DOM. Furthermore, CCs were more significant than CM in rice yield by 19.9-36.9%. The findings illustrated that LMH is more beneficial to agricultural soil as a soil conditioner to replace part of chemical fertilizer than CM.