Effects of biodegradable poly(butylene adipate‐co‐terephthalate) and poly(lactic acid) plastic degradation on soil ecosystems

IF 5 3区农林科学 Q1 SOIL SCIENCE

Soil Use and Management Pub Date : 2024-04-30 DOI:10.1111/sum.13055

Pavani Dulanja Dissanayake, Piumi Amasha Withana, Mee Kyung Sang, Yoora Cho, Jeyoung Park, Dongyeop X. Oh, Scott X. Chang, Carol Sze Ki Lin, Michael S. Bank, Sung Yeon Hwang, Yong Sik Ok

{"title":"Effects of biodegradable poly(butylene adipate‐co‐terephthalate) and poly(lactic acid) plastic degradation on soil ecosystems","authors":"Pavani Dulanja Dissanayake, Piumi Amasha Withana, Mee Kyung Sang, Yoora Cho, Jeyoung Park, Dongyeop X. Oh, Scott X. Chang, Carol Sze Ki Lin, Michael S. Bank, Sung Yeon Hwang, Yong Sik Ok","doi":"10.1111/sum.13055","DOIUrl":null,"url":null,"abstract":"Despite that biodegradable plastics are perceived as environmentally friendly, there is a lack of comprehensive understanding of their fate in soil. Current Environmental, Social, and Governance (ESG) frameworks, along with new UNEP regulations on plastic pollution, necessitate scientific information on plastic degradation in soils for developing sustainable biodegradable plastics. In this study, we examined the degradation rates of two biodegradable plastics, poly(butylene adipate‐co‐terephthalate) (PBAT) and poly(lactic acid) (PLA), in a laboratory microcosm experiment using uncontaminated soil, with PBAT or PLA added at 8.3% (w/w). Our aim was to further understand the impact of these plastic types on soil properties and microbial communities under different incubation temperatures. Both PBAT and PLA treatments elevated cumulative CO2 efflux compared with the control soil incubated at 25 and 58°C. After 33 weeks, 9.2% and 6.1% of the added PBAT and PLA degraded, respectively, at 58°C, while only 2.3% of PBAT and 1.7% of PLA degraded at 25°C, implying slower degradation rates of PBAT and PLA under the lower temperature. Degradation at 58°C increased total soil carbon by 0.6%, 1.9%, and 4.3% for Control, PBAT, and PLA, respectively, and soil electrical conductivity by 0.17, 0.33, and 2.38 dS m−1, respectively, but decreased soil pH. Microbial diversity and richness decreased under thermophilic conditions at 58°C compared with that at 25°C. We conclude that the degradation of PBAT and PLA varies with environmental condition, and influences soil properties.","PeriodicalId":21759,"journal":{"name":"Soil Use and Management","volume":"9 1","pages":""},"PeriodicalIF":5.0000,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Soil Use and Management","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1111/sum.13055","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"SOIL SCIENCE","Score":null,"Total":0}

引用次数: 0

Abstract

Despite that biodegradable plastics are perceived as environmentally friendly, there is a lack of comprehensive understanding of their fate in soil. Current Environmental, Social, and Governance (ESG) frameworks, along with new UNEP regulations on plastic pollution, necessitate scientific information on plastic degradation in soils for developing sustainable biodegradable plastics. In this study, we examined the degradation rates of two biodegradable plastics, poly(butylene adipate‐co‐terephthalate) (PBAT) and poly(lactic acid) (PLA), in a laboratory microcosm experiment using uncontaminated soil, with PBAT or PLA added at 8.3% (w/w). Our aim was to further understand the impact of these plastic types on soil properties and microbial communities under different incubation temperatures. Both PBAT and PLA treatments elevated cumulative CO2 efflux compared with the control soil incubated at 25 and 58°C. After 33 weeks, 9.2% and 6.1% of the added PBAT and PLA degraded, respectively, at 58°C, while only 2.3% of PBAT and 1.7% of PLA degraded at 25°C, implying slower degradation rates of PBAT and PLA under the lower temperature. Degradation at 58°C increased total soil carbon by 0.6%, 1.9%, and 4.3% for Control, PBAT, and PLA, respectively, and soil electrical conductivity by 0.17, 0.33, and 2.38 dS m−1, respectively, but decreased soil pH. Microbial diversity and richness decreased under thermophilic conditions at 58°C compared with that at 25°C. We conclude that the degradation of PBAT and PLA varies with environmental condition, and influences soil properties.

查看原文本刊更多论文

可生物降解的聚己二酸丁二醇酯和聚乳酸塑料降解对土壤生态系统的影响

尽管生物降解塑料被视为环保产品，但人们对其在土壤中的去向却缺乏全面的了解。当前的环境、社会和治理（ESG）框架以及联合国环境规划署（UNEP）针对塑料污染的新规定都要求我们提供有关塑料在土壤中降解的科学信息，以开发可持续的生物降解塑料。在这项研究中，我们利用未受污染的土壤，在添加了 8.3% （w/w）PBAT 或 PLA 的实验室微观世界实验中，考察了聚对苯二甲酸丁二醇酯（PBAT）和聚乳酸（PLA）这两种生物降解塑料的降解率。我们的目的是进一步了解这些塑料类型在不同培养温度下对土壤性质和微生物群落的影响。与在 25 和 58°C 温度下培养的对照土壤相比，PBAT 和聚乳酸处理都增加了累积的二氧化碳流出量。33 周后，添加的 PBAT 和聚乳酸在 58°C 下分别降解了 9.2% 和 6.1%，而在 25°C 下仅有 2.3% 的 PBAT 和 1.7% 的聚乳酸降解，这意味着 PBAT 和聚乳酸在较低温度下的降解速度较慢。在 58°C 的降解条件下，对照组、PBAT 和聚乳酸的土壤总碳量分别增加了 0.6%、1.9% 和 4.3%，土壤电导率分别增加了 0.17、0.33 和 2.38 dS m-1，但土壤 pH 值下降。与 25°C 的嗜热条件相比，58°C 的嗜热条件下微生物的多样性和丰富度都有所下降。我们的结论是，PBAT 和聚乳酸的降解随环境条件的变化而变化，并影响土壤性质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Soil Use and Management 农林科学-土壤科学

CiteScore

7.70

自引率

13.20%

发文量

审稿时长

3 months

期刊介绍： Soil Use and Management publishes in soil science, earth and environmental science, agricultural science, and engineering fields. The submitted papers should consider the underlying mechanisms governing the natural and anthropogenic processes which affect soil systems, and should inform policy makers and/or practitioners on the sustainable use and management of soil resources. Interdisciplinary studies, e.g. linking soil with climate change, biodiversity, global health, and the UN’s sustainable development goals, with strong novelty, wide implications, and unexpected outcomes are welcomed.