Effects of biodegradable plastics on soil properties and greenhouse gas production

IF 1.9 4区 农林科学 Q3 ENVIRONMENTAL SCIENCES
K. Inubushi, Yutaro Kakiuchi, Chiaki Suzuki, M. Sato, S. Ushiwata, M. Matsushima
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引用次数: 13

Abstract

ABSTRACT Microplastics cause environmental problems. Biodegradable plastics have become popular because they aim to avoid such problems. However, their decomposition in the soil may have an impact. This study aims to investigate the effects of biodegradable plastics on the physicochemical properties of soil, specifically the production of CO2 and N2O in the soil and plant growth. Three kinds of biodegradable plastics in the forms of 1) nonwoven fabric sheets made of poly-lactic acid (PLA) and polybutylene-succinate (referred to hereafter as fabric), 2) laminate sheets made of polybutylene adipate terephthalate (PBAT) and pulp (hereafter laminate), and 3) drinking cups made of PLA (hereafter cup), were cut into small pieces (<5 mm), added to soil, then water-holding capacity was determined and incubated aerobically for 4 weeks at 30°C in the dark. Soil and gas samples were collected weekly to measure soil pH, nitrate-nitrogen content, CO2, and N2O productions. These plastics were also tested in a pot experiment with Komatsuna (Brassica napa var. perviridis). We tested for seed germination, plant growth, leaf color, and fresh weight at harvest. Results showed that the water retention capacity was higher in the fabric plastics as compared to the cup plastics and the control. Soil pH with the fabric plastics dropped during the initial 2 weeks of incubation, then recovered to a similar pH to the control (without plastic). Nitrate contents in the soil with laminate plastics were lower than those in the control, while CO2 production in the soil with the laminate plastics was higher than that in the control and the other plastics during the incubation period, and even higher than the one of added plastic-C. N2O was produced rapidly within 1 week of incubation in the soil with the laminate plastics, and cumulative N2O production from incubation was more than that of the control. The seed germination and plant growth tended to be suppressed in the pot experiment with the fabric and laminate plastics. The results indicate that the influence of these biodegradable plastics on soil properties, greenhouse gas production, and plant growth on the kind of plastic and the timing.
可生物降解塑料对土壤特性和温室气体产生的影响
微塑料造成了环境问题。可生物降解塑料之所以受到欢迎,是因为它们旨在避免这些问题。然而,它们在土壤中的分解可能会产生影响。本研究旨在研究可生物降解塑料对土壤理化性质的影响,特别是对土壤中CO2和N2O的产生以及植物生长的影响。将聚乳酸(PLA)和聚丁二酸丁二酯(PBAT)和纸浆(PBAT)制成的层压板(以下简称层压板)和聚乳酸(PLA)制成的水杯(以下简称水杯)三种可生物降解塑料切成小块(< 5mm),加入土壤中,测定保水能力,在30℃的黑暗条件下好氧培养4周。每周采集土壤和气体样本,测量土壤pH值、硝酸盐氮含量、CO2和N2O产量。这些塑料还在小松菜(芸苔属)的盆栽试验中进行了测试。我们测试了种子发芽、植物生长、叶片颜色和收获时的鲜重。结果表明,织物塑料的保水能力比杯状塑料和对照塑料高。施用塑料织物的土壤pH值在孵育的最初两周内下降,然后恢复到与对照(不施用塑料)相似的pH值。施用层压塑料的土壤中硝酸盐含量低于对照,而在孵育期内,施用层压塑料的土壤CO2产量高于对照和其他塑料,甚至高于添加塑料- c的土壤。层压塑料土壤在1周内迅速产生N2O,且累积N2O产生量大于对照。在盆栽试验中,织物和层压塑料有抑制种子萌发和植物生长的趋势。结果表明,这些生物降解塑料对土壤性质、温室气体排放和植物生长的影响与塑料的种类和时间有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Soil Science and Plant Nutrition
Soil Science and Plant Nutrition 农林科学-农艺学
CiteScore
4.80
自引率
15.00%
发文量
56
审稿时长
18-36 weeks
期刊介绍: Soil Science and Plant Nutrition is the official English journal of the Japanese Society of Soil Science and Plant Nutrition (JSSSPN), and publishes original research and reviews in soil physics, chemistry and mineralogy; soil biology; plant nutrition; soil genesis, classification and survey; soil fertility; fertilizers and soil amendments; environment; socio cultural soil science. The Journal publishes full length papers, short papers, and reviews.
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