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Evaluation of Fresh Mushroom Compost in a Field Corn Production System 鲜蘑菇堆肥在大田玉米生产系统中的应用评价
4区 农林科学 Q3 ECOLOGY Pub Date : 2020-04-02 DOI: 10.1080/1065657x.2020.1749184
Phillip S Coles, Galina Nogin, M. Fidanza, G. Roth
Abstract Commercial mushroom producers are continually looking for new substrate raw material sources and pathways to dispose of mushroom compost (formerly called “spent mushroom substrate”) after crop completion. A relatively new material used in the mushroom industry is corn stover, but supplies are somewhat limited. Corn farmers are often reluctant to remove stover from fields because of nutrient loss and possible soil erosion due to reduced soil protection, however, mushroom compost may be a potential substitute for stover. This field study evaluated the potential to improve corn crop yield and soil quality through stover removal coupled with the soil surface application of fresh mushroom compost. Stover was removed in amounts of 0, 70, and 100% and replaced with fresh mushroom compost at rates of 0, 5, 10, 20, and 40 tons per acre to find an optimal rate for both, and to provide a rationale to replace stover with mushroom compost in order to generate additional income for corn farmers, and increase substrate component availability and mushroom compost disposal alternatives, to the mushroom industry. The results showed that corn stover removal did not influence corn yield, but an increase in corn yield trend was observed with the application of an increasing amounts ≥ 20 tons fresh mushroom compost per acre. Analysis of soil parameters, at 0-2 inch and 2-8 inch rootzone depths, at the start of the field study compared to approximately one year later were mostly inconclusive. Of note, the addition of ≥ 5 tons fresh mushroom compost per acre resulted in an increase in soil pH at 0-2 inch depth.
商业蘑菇生产者不断寻找新的基质原料来源和途径处理蘑菇堆肥(以前称为“废蘑菇基质”)作物完成后。蘑菇工业中使用的一种相对较新的材料是玉米秸秆,但供应有些有限。由于土壤保护的减少,玉米种植者往往不愿意将秸秆从田地中移走,因为养分损失和可能的土壤侵蚀,然而,蘑菇堆肥可能是秸秆的潜在替代品。本田间研究评价了秸秆去除与土壤表面施用新鲜蘑菇堆肥对提高玉米产量和土壤质量的潜力。以0,70和100%的量去除秸秆,并以每英亩0,5,10,20和40吨的速度用新鲜蘑菇堆肥代替,以找到两者的最佳比率,并为蘑菇产业提供用蘑菇堆肥代替秸秆的基本原理,以便为玉米农民带来额外收入,并增加基质成分的可用性和蘑菇堆肥处理替代品。结果表明:玉米秸秆去除对玉米产量没有影响,但随着用量≥20 t /亩的增加,玉米产量有增加的趋势。在实地研究开始时,将0-2英寸和2-8英寸根区深度的土壤参数与大约一年后的土壤参数进行比较,结果大多不确定。值得注意的是,每英亩添加≥5吨新鲜蘑菇堆肥导致0-2英寸深度土壤pH值增加。
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引用次数: 5
The Organic Degradation and Potential Microbial Function in a 15-Day Sewage Sludge Biodrying 污水污泥15天生物干燥过程中的有机降解及潜在微生物功能
4区 农林科学 Q3 ECOLOGY Pub Date : 2020-01-02 DOI: 10.1080/1065657X.2020.1749183
Yangcai Wang, Sheng-Wei Zheng, D. Gao, L. Cai
Abstract To meet the challenge of increased sludge generation, shortening of biodrying periods are required. This study assesses a shortened sewage sludge biodrying period of 15 days. The fundamental physicochemical properties of samples from different phases were determined, the functional groups were identified using infrared spectroscopy and the biodrying associated microbial functions were annotated against gene databases. After a 15-day biodrying period, the moisture content, readily degradable carbohydrate, lignocellulose and protein levels were significantly reduced. The distinct attenuation of peaks identified by infrared spectroscopy, indicates that the degradation of most lipids, proteins and polysaccharides in the biodrying matrix had reached equilibration on Day 15 and following this biosynthesis may result in an increased polysaccharide content. However, the biodrying matrix on Day 20 was only partially matured. Firmicutes, Actinobacteria and Proteobacteria were the most ecologically dominant phyla. These ecologically dominant microorganisms were also functionally dominant in biodrying associated metabolic pathways (glycolysis, amino sugar and nucleotide sugar metabolism, starch and sucrose metabolism), as well as containing carbohydrate-active enzyme families. The modified 15-day biodrying period reduced the treatment time and achieved a competent biodrying result without increasing the operating costs. The 15-day treatment would increase the rate of existing systems or decrease the capital cost of new systems.
摘要为了应对污泥生成增加的挑战,需要缩短生物干燥期。这项研究评估了污水污泥生物干燥期缩短15 天。测定了不同阶段样品的基本物理化学性质,使用红外光谱鉴定了官能团,并根据基因数据库对生物干燥相关的微生物功能进行了注释。经过15天的生物干燥期后,水分含量、易降解碳水化合物、木质纤维素和蛋白质水平显著降低。通过红外光谱鉴定的峰的明显衰减表明,生物干燥基质中大多数脂质、蛋白质和多糖的降解在第15天达到平衡,并且在这种生物合成之后可能导致多糖含量增加。然而,生物干燥基质在第20天仅部分成熟。厚壁菌门、放线菌门和变形菌门是最具生态优势的门。这些生态优势微生物在生物干燥相关代谢途径(糖酵解、氨基糖和核苷酸糖代谢、淀粉和蔗糖代谢)中也具有功能优势,并含有碳水化合物活性酶家族。改良的15天生物干燥期减少了处理时间,并在不增加操作成本的情况下取得了良好的生物干燥效果。15天的治疗将提高现有系统的使用率或降低新系统的资本成本。
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引用次数: 0
Labile Carbon Affects Fecundity of Omodeoscolex divergens and Eudrilus eugeniae under Pure and Mixed Culture Vermicomposting 纯蚯蚓堆肥和混合蚯蚓堆肥条件下,不稳定碳对分化单孢菌和真丝线虫繁殖力的影响
4区 农林科学 Q3 ECOLOGY Pub Date : 2020-01-02 DOI: 10.1080/1065657X.2020.1727788
Micah Martin, G. Eudoxie, G. Gouveia
Abstract Detergent fiber analysis was used to fractionate carbon (C) into hemicellulose (degradable carbon) and cellulose and lignin (recalcitrant carbon) for cattle manure (CM), neem leaves (NL), corn stover (CS), and lawn clipping (LC) to investigate the effects of C quality on vermicomposting. A factorial design having five C sources (CM, CM + NL, CS, CS + NL, and LC) and two earthworm species (Eudrilus eugeniae (EE) and Omodeoscolex divergens (OD)) was studied under pure and mixed culture vermicomposting. Earthworm fecundity, biomass, and vermicompost quality were measured. The combination of culture and C source was significant (p < 0.05) for all fecundity and biomass variables. CM and CM + NL were mainly associated with increased responses. Change in population was > tenfold for EE and OD reared on CM. Percentage change in biomass increased up to 200% for OD and EE when fed CM and CM + NL. Contrastingly, decreases or no changes in fecundity and biomass parameters were associated with CS and CS + NL. The NL combinations resulted in lower responses in fecundity and biomass; however, earthworms favored CM + NL over CS + NL. OD was highest (p < 0.05) amongst cultures for LC. The mixed culture response was generally low for parameters measured. Vermicompost C/N ratio decreased from initial carbon source values except for LC. O. divergens vermi-converted carbon sources of varying C quality, producing distinct vermicompost in the process.
摘要采用洗涤纤维分析方法,将牛粪(CM)、楝叶(NL)、玉米秸秆(CS)和草坪修剪(LC)中的碳(C)分馏为半纤维素(可降解碳)和纤维素和木质素(难降解碳),研究C品质对蚯蚓堆肥的影响。采用纯蚯蚓堆肥和混合蚯蚓堆肥两种蚯蚓(Eudrilus eugenae (EE)和Omodeoscolex divergens (OD)),对5种C源(CM、CM + NL、CS、CS + NL和LC)进行了因子设计。测定了蚯蚓的繁殖力、生物量和蚯蚓堆肥质量。培养物和C源的组合对CM上饲养的EE和OD有显著的影响(p 10倍)。饲喂CM和CM + NL时,OD和EE的生物量变化百分比增加了200%。相比之下,CS和CS + NL的繁殖力和生物量参数降低或没有变化。NL组合对繁殖力和生物量的响应较低;然而,蚯蚓更喜欢CM + NL而不是CS + NL。各培养物中以LC的OD最高(p < 0.05)。混合培养对所测参数的响应一般较低。除LC外,蚯蚓堆肥C/N比较初始碳源值有所下降。不同碳质量的蚯蚓转化碳源,在此过程中产生不同的蚯蚓堆肥。
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引用次数: 0
Utilization of Bio-Municipal Solid Waste Improves Saline-Sodic Soils and Crop Productivity in Rice-Wheat 利用城市生活垃圾提高水稻-小麦盐碱地和作物生产力
4区 农林科学 Q3 ECOLOGY Pub Date : 2020-01-02 DOI: 10.1080/1065657X.2019.1709106
G. Zaman, B. Murtaza, M. Imran, M. Shahid, G. M. Shah, M. Amjad, M. Naeem, M. Mubeen, G. Murtaza
Abstract Solid waste management and soil degradation are the two main issues faced by the developing countries. The present study is the first effort to use bio-municipal solid waste (MSW) for the amelioration of saline-sodic soils of Pakistan. A pot experiment was conducted to evaluate the effects of MSW, farm yard manure (FM) and gypsum application on nitrate leaching, soil physicochemical characteristics and crop productivity under rice-wheat cropping system. The MSW was aerobically composted alone (MSW compost) or with FM (MSW_manure compost) or buried underground in lined pit for anaerobic decomposition (buried MSW) . Maximum nitrate leaching was observed during rice (84.91 mg L−1) and wheat (46.18 mg L−1) with buried MSW as compared with control treatment. Results showed that buried MSW significantly (p < 0.05) lowered the soil pHs (-5.6%), electrical conductivity (-38.8%), calcium carbonate (-45.8%), and sodium adsorption ratio (-51.4%) and significantly increased the organic matter (86.3%) and cation exchange capacity (31.50%) as compared with control treatment. Path analysis showed the highest direct path coefficient during rice and the lowest one during wheat. Soil amelioration with organic amendments was further confirmed with multivariate analysis. This study has proved that buried MSW can be used as an effective solution for MSW disposal thereby improving soil physicochemical properties and crop productivity from saline-sodic soil.
固体废物管理和土壤退化是发展中国家面临的两个主要问题。本研究首次尝试利用生物城市固体废物(MSW)改良巴基斯坦的盐碱土。通过盆栽试验,研究了稻麦轮作条件下城市生活垃圾、农家肥和石膏对硝酸盐浸出、土壤理化特性和作物生产力的影响。MSW单独进行有氧堆肥(MSW堆肥)或与FM(MSW_manure堆肥)或埋在地下的内衬坑中进行厌氧分解(埋置MSW)。水稻硝酸盐浸出量最大(84.91 mg L−1)和小麦(46.18 mg L−1)与埋置MSW处理相比。结果表明,填埋MSW显著(p < 0.05)降低了土壤pH值(-5.6%)、电导率(-38.8%)、碳酸钙(-45.8%)和钠吸附率(-51.4%),并显著提高了有机质(86.3%)和阳离子交换能力(31.50%)。通径分析表明,水稻期直接通径系数最高,小麦期最低。多元分析进一步证实了有机改良剂对土壤的改良作用。本研究证明,埋置MSW可以作为处理MSW的有效解决方案,从而改善盐碱土的土壤理化性质和作物生产力。
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引用次数: 5
A Comparative Study of the Reproductive and the Vermicomposting Ability of Three Generations of Epigeic and Anecic Earthworms When Subjected to a Toxic Weed (Ipomoea) as the Sole Feed 以毒草为唯一饲料的3代附生蚯蚓和异生蚯蚓繁殖和蚯蚓堆肥能力的比较研究
4区 农林科学 Q3 ECOLOGY Pub Date : 2020-01-02 DOI: 10.1080/1065657X.2019.1709918
S. A. Abbasi, P. Patnaik, Tabassum- Abbasi, Channgam Khamrang, Tasneem Abbasi
Abstract Recent studies by these authors have shown that the toxic and allalopathic weed ipomoea (Ipomoea carnea), gets transformed into benign organic fertilizer when subjected to vermicomposting. To derive benefit from this finding, it is necessary that a process should be made available for uninterrupted and efficient conversion of ipomoea into vermicompost. The present study has been done toward development of such a process, based on the concept of high-rate vermicomposting. It explores the relative ability to vermicompost ipomoea, and to reproduce in ipomoea-fed vermireactors, of successive generations of four species of earthworms — born and raised in ipomoea-fed vermireactors — in comparison to the first generation which had been raised to adulthood on cow-dung. Three epigeic species Eisenia andrei, Peryonix sansibaricus, Lumbricus rubillus, and one anecic Drawida willsi were explored for the purpose. The results, obtained over 480 days of uninterrupted reactor operation, show that the first generation of all four species of earthworms was slow to adapt to the ipomoea feed and took about 40 days to produce consistent quantities of vermicast. The second and the third generations didn’t need this adaptation and each generated vermicompost at significantly faster rates than it’s previous generation. Overall, the third generation of E. andrei, P. sansibaricus, L. rubellus and D. willsi produced 40, 41, 28, and 26% more vermicast, respectively, than the pioneers of the corresponding species. Similar trend was seen in fecundity as well. Each new generation produced more juveniles and cocoons than the previous generation, the increase being statistically significant at ≥ 95% confidence level. The findings reveal that earthworms can be made to adapt to ipomoea as their sole feed and the earthworm generations born and raised in ipomoea-fed vermireactors display significantly greater vermicomposting ability as well on fecundity than the earthworms which had been cultured on animal manure.
摘要这些作者最近的研究表明,当进行蚯蚓堆肥时,有毒的、有全草病的杂草ipomoea(ipomoea carnea)会转化为良性有机肥料。为了从这一发现中获益,有必要制定一个不间断、高效地将ipomoea转化为蚯蚓堆肥的过程。本研究基于高速蚯蚓堆肥的概念,致力于开发这种工艺。它探索了四种蚯蚓的相对繁殖能力,与第一代在牛粪上长大成人的蚯蚓相比,这四种蚯蚓是在以蚯蚓为食的蚯蚓中出生和长大的。为此,对三种表观植物——安氏爱胜螺、桑氏Peryonix sansibaricus、rubillus Lumbricus和一种珍奇植物Drawida willsi进行了探索。结果,超过480 连续几天不间断的反应器运行表明,所有四种蚯蚓的第一代对ipomoea饲料的适应缓慢,大约需要40天 天来生产出一致数量的朱砂。第二代和第三代不需要这种适应,每一代产生蚯蚓堆肥的速度都比上一代快得多。总的来说,第三代的E.andrei、P.sansibaricus、L.rubellus和D.willsi分别比相应物种的先驱多出40%、41%、28%和26%的朱砂。在繁殖力方面也出现了类似的趋势。每一代新生代都比上一代产生了更多的幼体和茧,在≥95%的置信水平下,这一增长具有统计学意义。研究结果表明,蚯蚓可以适应以ipomoea为唯一饲料,在ipomoea饲养的蚯蚓反应器中出生和长大的蚯蚓后代比在动物粪便中培养的蚯蚓表现出更大的蚯蚓堆肥能力和繁殖力。
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引用次数: 2
Exhaust Gas Concentrations and Elemental Losses from a Composting Drum Treating Horse Manure 处理马粪的堆肥桶的废气浓度和元素损失
4区 农林科学 Q3 ECOLOGY Pub Date : 2020-01-02 DOI: 10.1080/1065657X.2020.1749182
A. Løes, R. Khalil, Kirsty McKinnon
Abstract A farm scale composting drum was used to study exhaust gases from horse manure, and from horse manure mixed with tomato plant residues (TPR) with a lower C/N ratio. To study whether this addition increased gaseous losses of nitrogen (N) and sulphur (S), selected gas compounds of carbon (C) and N, and sulphur dioxide (SO2), were measured on three dates by Fourier Transform Infrared spectroscopy (FTIR). From the gas production in the drum (g per kg wet substrate), and the content of C, N and S in substrates, elemental losses of C, N and S were assessed. Temperatures in the substrate inside the drum reached 55–60 °C. The production of methane (CH4) increased when the mean retention time increased from about 2 to 6.3 days. Replacing 50% of the substrate weight by TPR slightly increased the production of NH3, but not of N2O, NO2 or SO2. We did not find increased losses of C, N or S after addition of TPR, but the production of NH3 and SO2 fluctuated much more. The mean production of nitrous oxide (N2O) and CH4 comprised 15 g CO2 equivalents per kg wet substrate, ranging from 8 to 27. Nitrous oxide comprised 80–90%. Over three gas measurements, drum treatment reduced the C content in wet substrate by 7–10%, the N content by about 2% and the S content by 0.2–1%.
摘要采用农场规模堆肥桶,对低碳氮比马粪和低碳氮比马粪与番茄残茬(TPR)混合产生的废气进行了研究。为了研究这种添加是否增加了氮(N)和硫(S)的气体损失,用傅里叶变换红外光谱(FTIR)对选定的碳(C)、氮(N)和二氧化硫(SO2)的气体化合物进行了三次测量。从桶内产气量(g / kg湿底物)和底物中C、N和S的含量,评估了C、N和S的元素损失。鼓内衬底的温度达到55-60℃。甲烷(CH4)产量随着平均滞留时间由2天增加到6.3天而增加。用TPR代替基质重量的50%,NH3的产量略有增加,但N2O、NO2和SO2的产量没有增加。我们没有发现添加TPR后C、N和S的损失增加,但NH3和SO2的产量波动更大。氧化亚氮(N2O)和甲烷的平均产量包括每千克湿基质15克二氧化碳当量,范围从8到27。氧化亚氮占80-90%。在三次气体测量中,鼓式处理使湿基质中的C含量降低了7-10%,N含量降低了约2%,S含量降低了0.2-1%。
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引用次数: 1
Opposing Age-Related Trends in Absolute and Relative Risk of Adverse Health Outcomes Associated With Out-of-Office Blood Pressure. 与诊室外血压相关的不良健康后果绝对风险和相对风险的年龄相关趋势截然相反。
IF 8.3 4区 农林科学 Q3 ECOLOGY Pub Date : 2019-12-01 Epub Date: 2019-10-21 DOI: 10.1161/HYPERTENSIONAHA.119.12958
Yan Li, Lutgarde Thijs, Zhen-Yu Zhang, Kei Asayama, Tine W Hansen, José Boggia, Kristina Björklund-Bodegård, Wen-Yi Yang, Teemu J Niiranen, Angeliki Ntineri, Fang-Fei Wei, Masahiro Kikuya, Takayoshi Ohkubo, Eamon Dolan, Atsushi Hozawa, Ichiro Tsuji, Katarzyna Stolarz-Skrzypek, Qi-Fang Huang, Jesus D Melgarejo, Valérie Tikhonoff, Sofia Malyutina, Edoardo Casiglia, Yuri Nikitin, Lars Lind, Edgardo Sandoya, Lucas Aparicio, Jessica Barochiner, Natasza Gilis-Malinowska, Krzysztof Narkiewicz, Kalina Kawecka-Jaszcz, Gladys E Maestre, Antti M Jula, Jouni K Johansson, Tatiana Kuznetsova, Jan Filipovský, George Stergiou, Ji-Guang Wang, Yutaka Imai, Eoin O'Brien, Jan A Staessen

Participant-level meta-analyses assessed the age-specific relevance of office blood pressure to cardiovascular complications, but this information is lacking for out-of-office blood pressure. At baseline, daytime ambulatory (n=12 624) or home (n=5297) blood pressure were measured in 17 921 participants (51.3% women; mean age, 54.2 years) from 17 population cohorts. Subsequently, mortality and cardiovascular events were recorded. Using multivariable Cox regression, floating absolute risk was computed across 4 age bands (≤60, 61-70, 71-80, and >80 years). Over 236 491 person-years, 3855 people died and 2942 cardiovascular events occurred. From levels as low as 110/65 mm Hg, risk log-linearly increased with higher out-of-office systolic/diastolic blood pressure. From the youngest to the oldest age group, rates expressed per 1000 person-years increased (P<0.001) from 4.4 (95% CI, 4.0-4.7) to 86.3 (76.1-96.5) for all-cause mortality and from 4.1 (3.9-4.6) to 59.8 (51.0-68.7) for cardiovascular events, whereas hazard ratios per 20-mm Hg increment in systolic out-of-office blood pressure decreased (P≤0.0033) from 1.42 (1.19-1.69) to 1.09 (1.05-1.12) and from 1.70 (1.51-1.92) to 1.12 (1.07-1.17), respectively. These age-related trends were similar for out-of-office diastolic pressure and were generally consistent in both sexes and across ethnicities. In conclusion, adverse outcomes were directly associated with out-of-office blood pressure in adults. At young age, the absolute risk associated with out-of-office blood pressure was low, but relative risk high, whereas with advancing age relative risk decreased and absolute risk increased. These observations highlight the need of a lifecourse approach for the management of hypertension.

参与者水平的荟萃分析评估了办公室血压与心血管并发症的年龄相关性,但缺乏办公室外血压的相关信息。来自 17 个人群队列的 17 921 名参与者(51.3% 为女性;平均年龄 54.2 岁)在基线时测量了日间流动血压(n=12624)或家庭血压(n=5297)。随后记录了死亡率和心血管事件。通过多变量 Cox 回归,计算了 4 个年龄段(≤60 岁、61-70 岁、71-80 岁和大于 80 岁)的浮动绝对风险。在 236 491 人年中,有 3855 人死亡,2942 人发生心血管事件。从低至 110/65 mm Hg 的血压水平开始,随着诊室外收缩压/舒张压的升高,风险呈对数线性上升。从最年轻的年龄组到最年长的年龄组,每千人年的发病率分别从 1.42(1.19-1.69)上升到 1.09(1.05-1.12)和从 1.70(1.51-1.92)上升到 1.12(1.07-1.17)(PP≤0.0033)。这些与年龄相关的趋势与诊室外舒张压的趋势相似,并且在男女和不同种族中基本一致。总之,成人的不良后果与诊室外血压直接相关。年轻时,与办公室外血压相关的绝对风险较低,但相对风险较高,而随着年龄的增长,相对风险降低,绝对风险增加。这些观察结果凸显了采用生命周期方法管理高血压的必要性。
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引用次数: 0
Association of Cyberbullying Involvement With Subsequent Substance Use Among Adolescents. 参与网络欺凌与青少年随后使用药物的关系。
IF 5.5 4区 农林科学 Q3 ECOLOGY Pub Date : 2019-11-01 Epub Date: 2019-07-17 DOI: 10.1016/j.jadohealth.2019.05.006
Yoewon Yoon, Jungeun Olivia Lee, Junhan Cho, Mariel S Bello, Rubin Khoddam, Nathaniel R Riggs, Adam M Leventhal

Purpose: Adolescent involvement in cyberbullying is common and involves several roles (witness, perpetrator, or victim). Whether different cyberbullying roles are differentially associated with substance use is unknown. The present study examined the associations of adolescent cyberbullying involvement with use and polyuse of various substances.

Methods: A longitudinal cohort of students in Los Angeles, California (N = 2,768) completed surveys at baseline (10th grade, 2014, mean age = 15.5 years) and 12-month follow-up (11th grade, 2015). Five mutually exclusive cyberbullying roles were identified at baseline-no involvement; witness only; witness and victim; witness and perpetrator; and witness, victim, and perpetrator. Past 6-month use of nine substances and poly-use of multiple substances were assessed at baseline and follow-up.

Results: Most students (52.2%) were involved in >1 cyberbullying roles. Relative to no involvement, all cyberbullying roles, including witnessing only, were associated with increased odds of using most substances and polysubstance use at follow-up, after adjusting for sociodemographics and baseline substance use (odds ratios: 1.44 [95% confidence interval: 1.18-1.76] to 5.24 [2.73-10.05]). Relative to the witness-only role, students involved in all three roles were at greater odds of using several substances at follow-up (odds ratios: 1.47 [95% confidence interval: 1.05-2.05] to 2.96 [1.60-5.50]).

Conclusions: Cyberbullying involvement, even witnessing, may be associated with future substance use in adolescence. All cyberbullying roles warrant consideration in understanding and preventing youth substance use.

目的:青少年参与网络欺凌很常见,并涉及多种角色(目击者、施暴者或受害者)。不同的网络欺凌角色是否与药物使用有不同的关联尚不清楚。本研究探讨了青少年参与网络欺凌与使用和多次使用各种药物之间的关系:加利福尼亚州洛杉矶市的一组纵向学生(N = 2,768)在基线(2014 年 10 年级,平均年龄 = 15.5 岁)和 12 个月随访(2015 年 11 年级)期间完成了调查。基线调查确定了五种相互排斥的网络欺凌角色--未参与;仅为目击者;目击者和受害者;目击者和施暴者;目击者、受害者和施暴者。在基线和随访期间,对过去 6 个月使用 9 种药物和多次使用多种药物的情况进行了评估:结果:大多数学生(52.2%)都参与了一次以上的网络欺凌行为。与未参与网络欺凌相比,所有网络欺凌角色(包括仅目睹网络欺凌)都会增加学生在后续调查中使用大多数药物和多种药物的几率,这是在对社会人口统计学和基线药物使用情况进行调整后得出的结果(几率比:1.44 [95% 置信区间:1.18-1.76] 至 5.24 [2.73-10.05])。与只扮演证人角色的学生相比,扮演所有三种角色的学生在后续调查中使用多种药物的几率更大(几率比:1.47 [95% 置信区间:1.05-2.05] 至 2.96 [1.60-5.50]):结论:参与网络欺凌,甚至是目睹网络欺凌,可能与青少年未来使用药物有关。在了解和预防青少年使用药物方面,所有网络欺凌角色都值得考虑。
{"title":"Association of Cyberbullying Involvement With Subsequent Substance Use Among Adolescents.","authors":"Yoewon Yoon, Jungeun Olivia Lee, Junhan Cho, Mariel S Bello, Rubin Khoddam, Nathaniel R Riggs, Adam M Leventhal","doi":"10.1016/j.jadohealth.2019.05.006","DOIUrl":"10.1016/j.jadohealth.2019.05.006","url":null,"abstract":"<p><strong>Purpose: </strong>Adolescent involvement in cyberbullying is common and involves several roles (witness, perpetrator, or victim). Whether different cyberbullying roles are differentially associated with substance use is unknown. The present study examined the associations of adolescent cyberbullying involvement with use and polyuse of various substances.</p><p><strong>Methods: </strong>A longitudinal cohort of students in Los Angeles, California (N = 2,768) completed surveys at baseline (10th grade, 2014, mean age = 15.5 years) and 12-month follow-up (11th grade, 2015). Five mutually exclusive cyberbullying roles were identified at baseline-no involvement; witness only; witness and victim; witness and perpetrator; and witness, victim, and perpetrator. Past 6-month use of nine substances and poly-use of multiple substances were assessed at baseline and follow-up.</p><p><strong>Results: </strong>Most students (52.2%) were involved in >1 cyberbullying roles. Relative to no involvement, all cyberbullying roles, including witnessing only, were associated with increased odds of using most substances and polysubstance use at follow-up, after adjusting for sociodemographics and baseline substance use (odds ratios: 1.44 [95% confidence interval: 1.18-1.76] to 5.24 [2.73-10.05]). Relative to the witness-only role, students involved in all three roles were at greater odds of using several substances at follow-up (odds ratios: 1.47 [95% confidence interval: 1.05-2.05] to 2.96 [1.60-5.50]).</p><p><strong>Conclusions: </strong>Cyberbullying involvement, even witnessing, may be associated with future substance use in adolescence. All cyberbullying roles warrant consideration in understanding and preventing youth substance use.</p>","PeriodicalId":10714,"journal":{"name":"Compost Science & Utilization","volume":"3 1","pages":"613-620"},"PeriodicalIF":5.5,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6814523/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81766413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimizing Heat Extraction from Compost 优化堆肥的热提取
4区 农林科学 Q3 ECOLOGY Pub Date : 2019-10-02 DOI: 10.1080/1065657X.2019.1686443
K. Nwanze, O. G. Clark
Abstract The need for renewable sources of energy has fueled interest in harvesting the heat produced by composting. Pilot-scale compost reactors were built with in-vessel heat exchangers to test the effect of heat extraction on the composting process. Water was passed through copper tubes embedded in the compost-filled barrels and the temperatures of the compost and the inlet and outlet water were monitored. More heat could be extracted with higher water flow rates. Compost temperatures were especially sensitive to the water flow rate during the thermophilic stage. The data from this experiment was then used to update a computational model of the composting process. COMSOL Multiphysics™ (v. 5.2, COMSOL AB, Stockholm, Sweden) was used to create a three-dimensional, finite-element simulation of mass and energy balances in the compost barrels. The model was validated against empirical data from the experiment. Simulated and empirical data were in general agreement from the start of composting until peak thermophilic temperatures, at which point they diverged, likely due to inappropriate heat transfer boundary conditions in the model. This work is a step in the development of empirically validated computational tools for the optimal design of compost heat extraction systems.
对可再生能源的需求激发了人们对收集堆肥产生的热量的兴趣。采用容器式热交换器建立了中试堆肥反应器,以测试热抽提对堆肥过程的影响。水通过埋在装满堆肥的桶内的铜管,并监测堆肥和进出水的温度。更高的水流速率可以提取更多的热量。在嗜热阶段,堆肥温度对水流速率特别敏感。该实验的数据随后被用于更新堆肥过程的计算模型。使用COMSOL Multiphysics™(v. 5.2, COMSOL AB, Stockholm, Sweden)创建堆肥桶中质量和能量平衡的三维有限元模拟。根据实验数据对模型进行了验证。从堆肥开始到嗜热温度达到峰值,模拟数据和经验数据基本一致,在这一点上它们出现分歧,可能是由于模型中的传热边界条件不适当。这项工作是在经验验证的计算工具的优化设计堆肥热提取系统的发展的一步。
{"title":"Optimizing Heat Extraction from Compost","authors":"K. Nwanze, O. G. Clark","doi":"10.1080/1065657X.2019.1686443","DOIUrl":"https://doi.org/10.1080/1065657X.2019.1686443","url":null,"abstract":"Abstract The need for renewable sources of energy has fueled interest in harvesting the heat produced by composting. Pilot-scale compost reactors were built with in-vessel heat exchangers to test the effect of heat extraction on the composting process. Water was passed through copper tubes embedded in the compost-filled barrels and the temperatures of the compost and the inlet and outlet water were monitored. More heat could be extracted with higher water flow rates. Compost temperatures were especially sensitive to the water flow rate during the thermophilic stage. The data from this experiment was then used to update a computational model of the composting process. COMSOL Multiphysics™ (v. 5.2, COMSOL AB, Stockholm, Sweden) was used to create a three-dimensional, finite-element simulation of mass and energy balances in the compost barrels. The model was validated against empirical data from the experiment. Simulated and empirical data were in general agreement from the start of composting until peak thermophilic temperatures, at which point they diverged, likely due to inappropriate heat transfer boundary conditions in the model. This work is a step in the development of empirically validated computational tools for the optimal design of compost heat extraction systems.","PeriodicalId":10714,"journal":{"name":"Compost Science & Utilization","volume":"27 1","pages":"217 - 226"},"PeriodicalIF":0.0,"publicationDate":"2019-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/1065657X.2019.1686443","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44054082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Grape Fruit Waste Compost as a Nursery Substrate Ingredient for High-Quality Cucumber (Cucumis sativus L.) Seedlings Production 葡萄果渣堆肥作为优质黄瓜苗圃基质的研究苗生产
4区 农林科学 Q3 ECOLOGY Pub Date : 2019-10-02 DOI: 10.1080/1065657X.2019.1682086
Y. Bayoumi, A. El-Henawy, K. Abdelaal, N. Elhawat
Abstract Greenhouse experiments were conducted to evaluate the utilization of compost derived from grape fruit waste (GFW) as an ingredient in nursery substrates for germination and development of cucumber. A randomized complete block design was used with thirteen treatments (S1-S13) encompassing 100% composted GFW, 60% GFW + 40% poultry manure including hardwood sawdust, 80% GFW + 20% broad bean straw, 80% GFW + 20% poultry manure including wheat straw, 50% coco peat + 50% vermiculite (as a control) and different combination of GFW-based composts with either coco peat or vermiculite. The resulted illustrated that GFW mixed with broad bean straw and poultry manure regardless of its source improved the chemical properties of composted GFW. Composts of GFW were even richer in nutrients, i.e., N, P, K, organic matter, soluble cations and anions and C/N ratio than control (50% coco peat + 50% vermiculite) except pH and electrical conductivity (EC), which was lower. Concentration of Cu, Fe, Cd and Pb were significantly lower in GFW composts than control substrate; while total phenolic content was significantly the highest in single compost of GFW. Mixing GFW composts with either vermiculite or coco peat (at 1:1 ratio by volume) was optimal for seed germination and seedling growth parameters; those combined substrates showed the highest FGP, CGRI, survival rate, and growth parameters in most cases. The negative effects of singly GFW compost can be removed or improved by mixing it with coco peat or vermiculite, so seed germination, seedling growth and survival rate significantly enhanced with mixing GFW-compost with coco peat or vermiculite substrates at ratio of 1:1. These recycled wastes are low cost products that can be usefully used in horticultural nurseries on a commercial scale. Highlights Grape fruit waste compost had similar chemical properties to coco peat and vermiculite mixture Grape fruit waste compost had the highest total phenolic content Replacing coco peat or vermiculite by GFW compost enhanced seed germination of cucumber Mixing GFW compost with either coco peat or vermiculite improved seedling development of cucumber Replacing coco peat or vermiculite by GFW compost reduced the cost by 50%
摘要通过温室试验,评价了葡萄果渣堆肥作为栽培基质对黄瓜发芽发育的影响。采用随机完全区组设计,采用13个处理(S1-S13),包括100%堆肥的GFW、60%GFW+40%家禽粪便(包括硬木木屑)、80%GFW+20%蚕豆秸秆、80%GFW+20%家禽肥料(包括小麦秸秆)、50%椰子泥炭+50%蛭石(作为对照)以及基于GFW的堆肥与椰子泥炭或蛭石的不同组合。结果表明,无论其来源如何,GFW与蚕豆秸秆和家禽粪便混合都能改善堆肥GFW的化学性能。GFW堆肥的营养成分,即N、P、K、有机质、可溶性阳离子和阴离子以及C/N比,甚至比对照(50%椰子泥炭+50%蛭石)更丰富,但pH和电导率(EC)较低。GFW堆肥中Cu、Fe、Cd和Pb的浓度显著低于对照基质;而总酚含量在GFW的单个堆肥中显著最高。将GFW堆肥与蛭石或椰子泥炭(体积比为1:1)混合对种子发芽和幼苗生长参数是最佳的;在大多数情况下,这些组合底物显示出最高的FGP、CGRI、存活率和生长参数。将GFW堆肥与椰子泥炭或蛭石混合可以消除或改善单一GFW堆肥的负面影响,因此将GFW肥料与椰子泥炭和蛭石基质按1:1的比例混合可以显著提高种子的发芽率、幼苗生长和存活率。这些回收的废物是低成本的产品,可以在商业规模的园艺苗圃中有效使用。亮点葡萄果渣堆肥与椰子泥炭和蛭石混合物具有相似的化学性质葡萄果渣肥料的总酚含量最高用GFW堆肥代替椰子泥炭或蛭石可以提高黄瓜的种子发芽率将GFW堆肥与椰子泥煤或蛭石混合可以改善黄瓜的幼苗发育用GFW代替椰子泥煤和蛭石堆肥使成本降低了50%
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引用次数: 6
期刊
Compost Science & Utilization
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