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Possible hazards from biodegradation of soil plastic mulch: Increases in microplastics and CO2 emissions

文献类型： 外文期刊

作者： Hao, Yaqiong 1 ; Min, Ju 1 ; Ju, Shengrong 1 ; Zeng, Xiaoping 3 ; Xu, Jiyuan 4 ; Li, Jianbing 5 ; Wang, Hailong 6 ; Shaheen, Sabry M. 7 ; Bolan, Nanthi 10 ; Rinklebe, Joerg 7 ; Shi, Weiming 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Changshu Natl Agroecosyst Observat & Res Stn, Nanjing 210008, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Jiangsu Prov Agr Technol Extens Stn, Nanjing 210036, Peoples R China

4.Natl Agrotech Extens & Serv Ctr, Beijing 100026, Peoples R China

5.Jiangsu Acad Agr Sci, Inst Vegetable Crops, Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing 210014, Peoples R China

6.Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Peoples R China

7.Univ Wuppertal, Inst Fdn Engn Water & Waste Management, Sch Architecture & Civil Engn, Lab Soil and Groundwater Management, Pauluskirchstr 7, D-42285 Wuppertal, Germany

8.King Abdulaziz Univ, Fac Meteorol Environm & Arid Land Agr, Dept Arid Land Agr, Jeddah 21589, Saudi Arabia

9.Univ Kafrelsheikh, Fac Agr, Dept Soil & Water Sci, Kafr Al Sheikh 33516, Egypt

10.Univ Western Australia, Sch Agr & Environm, Perth, WA 6009, Australia

关键词： Plastic film; Biodegradable mulch; Microplastics; Carbon emission; Soil microorganism

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2024 年 467 卷

页码：

收录情况： SCI

摘要： Biodegradable mulches are widely recognized as ecologically friendly substances. However, their degradation percentage upon entering soils may vary based on mulch type and soil microbial activities, raising concerns about potential increases in microplastics (MPs). The effects of using different types of mulch on soil carbon pools and its potential to accelerate their depletion have not yet well understood. Therefore, we conducted an 18 month experiment to investigate mulch biodegradation and its effects on CO2 emissions. The experiment included burying soil with biodegradable mulch made of polylactic acid (PLA) and polybutylene adipate terephthalate (PBAT), and control treatments with traditional mulch (PE) and no mulch (CK). The results indicated that PE did not degrade, and the degradation percentage of PLA and PBAT were 46.2% and 88.1%, and the MPs produced by the degradation were 6.7 x 104 and 37.2 x 104 items/m2, respectively. Biodegradable mulch, particularly PLA, can enhance soil microbial diversity and foster more intricate bacterial communities compared to PE. The CO2 emissions were 0.58, 0.74, 0.99, and 0.86 g C/kg in CK, PE, PLA, , PBAT, respectively. A positive correlation was observed between microbial abundance and diversity with CO2 emissions, while a negative correlation was observed with soil total organic carbon. Biodegradable mulch enhanced the transformation of soil organic C into CO2 by stimulating microbial activity.

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