污泥热碱液对干旱胁迫下小青菜生长的缓解机制
近年来,为实现城市生活污泥的资源化利用,通过碱热水解技术制成的污泥热碱液被广泛关注。干旱是自然界中主要非生物胁迫之一,严重限制了作物的生长发育。为了改善干旱胁迫对蔬菜作物的影响,同时实现污泥资源化利用,本研究以小青菜(Brassica chinensis)为材料,通过盆栽试验设置4个水分梯度模拟不同干旱程度,在不同干旱程度下分别冲施等氮量的热碱液和尿素溶液,探讨热碱液对叶菜抵抗干旱胁迫的作用机制。结果表明:干旱胁迫下,经热碱液处理后,小青菜根长密度、根表面积密度和根体积密度均显著增加,进而促进对水分和氮素营养的吸收,提高叶片相对含水量,维持光合作用;冗余分析表明热碱液的施用主要提高过氧化氢酶活性和叶片相对含水量降低干旱胁迫对小青菜生长的负面影响。综上所述,将污泥热碱液应用到蔬菜生产中可缓解干旱胁迫对叶菜造成的生长抑制,为干旱地区蔬菜生产提供了策略,也为有效无害化、资源化利用城市生活污泥提供了一种新途径。
In recent years, there has been considerable attention given to the utilization of urban domestic sludgethrough the production of sludge alkaline thermal hydrolysis liquid using alkaline hot water lysis. Drought is amajor abiotic stress in nature, severely limiting crop production. To effectively mitigate the adverse impact ofdrought stress on vegetables and explore the potential of sludge utilization, this study used Brassica chinensis asthe research object. Different levels of drought stress were induced by creating four soil moisture gradients. Equalamounts of nitrogen from alkaline thermal hydrolysis liquid derived from sludge and urea solution were appliedunder different levels of drought stress to examine the resistance mechanism of the sludge- derived alkalinethermal hydrolysis liquid to drought stress. The results showed that when exposed to different drought stressconditions, the use of alkaline thermal hydrolysis liquid derived from sludge significantly improved the rootlength density, root surface area density, and root volume density. This enhancement improved the ability of B.chinensis to absorb water and nutrients from the soil and increased the leafs relative water content, helpingmaintain the plants photosynthesis process. Based on the redundancy analysis, applying alkaline thermalhydrolysis liquid to sludge could increase the leafs relative water content and improve catalase activity, therebyalleviating the growth inhibition of B. chinensis induced by drought stress. In summary, the application ofalkaline thermal hydrolysis liquid in vegetable production can help alleviate growth impediments caused bydrought stress on leafy vegetables, provide a strategy for vegetable production in arid areas, and introduce a novelmethod for the safe and effective utilization of urban sludge.
胥子航、李申、刘晓林、王永亮、杨治平、白炬、梁哲铭
农业科学研究环境科学理论废物处理、废物综合利用
污泥热碱液干旱胁迫抗氧化酶活性冗余分析污泥资源化利用
alkaline thermal hydrolysis liquid of sludgedrought stressautioxidant enzyme activitiesredundancy analysissludge resource utilization
胥子航,李申,刘晓林,王永亮,杨治平,白炬,梁哲铭.污泥热碱液对干旱胁迫下小青菜生长的缓解机制[EB/OL].(2024-03-01)[2025-08-23].https://chinaxiv.org/abs/202403.00033.点此复制
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