Plastic pollution in croplands threatens long-term food security
| Autor: | Baojing Gu, Wentao Sun, Qiuliang Lei, Fu Bin, Youhua Ma, Chaowen Lin, Wu Shuxia, Dongfeng Huang, Hude Yang, Binghui He, Lianfeng Du, Mingdong Zhou, Fulin Zhang, Ma Xingwang, Chang Peng, Jianwu Yao, Yan Li, Deli Chen, Huanchun Li, Yufeng Wang, Hongyuan Wang, Xuejun Zhang, Changlin Kou, Pablo Galaviz, Liang Gong, Shuqin Jin, Lihua Jiang, Dan Zhang, Zhiyu Xu, Jian Zhu, Shiyou Sun, Li Chongxiao, Ee Ling Ng, Wanli Hu, Limei Zhai, Bin Xi, Yitao Zhang, Zhenhua Cheng, Liu Xiaoxia, Peiyi Zhao, Hongbin Liu, Liuqiang Zhou, Junting Pan, Song Qin |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Crops Agricultural China 010504 meteorology & atmospheric sciences Plastic film 010603 evolutionary biology 01 natural sciences Food Supply Soil Environmental Chemistry Ecosystem 0105 earth and related environmental sciences General Environmental Science 2. Zero hunger Soil health Global and Planetary Change Ecology Crop yield Soil organic matter Agriculture 15. Life on land Plastic mulch 6. Clean water Agronomy 13. Climate action Soil water Environmental science Plastic pollution Mulch Plastics |
| Zdroj: | Global change biologyREFERENCES. 26(6) |
| ISSN: | 1365-2486 |
| Popis: | Plastic pollution is a global concern given its prevalence in aquatic and terrestrial ecosystems. Studies have been conducted on the distribution and impact of plastic pollution in marine ecosystems, but little is known on terrestrial ecosystems. Plastic mulch has been widely used to increase crop yields worldwide, yet the impact of plastic residues in cropland soils to soil health and crop production in the long term remained unclear. In this paper, using a global meta-analysis, we found that the use of plastic mulch can indeed increase crop yields on average by 25%-42% in the immediate season due to the increase of soil temperature (+8%) and moisture (+17%). However, the unabated accumulation of film residues in the field negatively impacts its physicochemical properties linked to healthy soil and threatens food production in the long term. It has multiple negative impacts on plant growth including crop yield (at the mean rate of -3% for every additional 100 kg/ha of film residue), plant height (-2%) and root weight (-5%), and soil properties including soil water evaporation capacity (-2%), soil water infiltration rate (-8%), soil organic matter (-0.8%) and soil available phosphorus (-5%) based on meta-regression. Using a nationwide field survey of China, the largest user of plastic mulch worldwide, we found that plastic residue accumulation in cropland soils has reached 550,800 tonnes, with an estimated 6%-10% reduction in cotton yield in some polluted sites based on current level of plastic residue content. Immediate actions should be taken to ensure the recovery of plastic film mulch and limit further increase in film residue loading to maintain the sustainability of these croplands. |
| Databáze: | OpenAIRE |
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