A global assessment of the long-term effects of biochar application on crop yield

IF 3.7 Q2 ENVIRONMENTAL SCIENCES
Yuhan Jiang , Tong Li , Xiangrui Xu , Jianfei Sun , Genxing Pan , Kun Cheng
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引用次数: 0

Abstract

The impact of biochar application on crop yield has always been a topic of concern. However, most current research focuses on the short-term effects of biochar on crop growth. Investigating the long-term effects of biochar in increasing crop yields is crucial for food security and sustainable agricultural development. To address this issue, this study performed a coupling of meta-analysis and structural equation model (SEM) based on the establishment of a dataset containing 981 sets of observations. The results demonstrated that biochar significantly and durably boosted crop yield, and biochar also has shown an average increase of 36.2% in SOC over a monitoring period exceeding 2 years. Crop yields increased by an average of 16% after biochar application for the long-term scale, although the increase varied across crop types, and biochar application performed better on corn and wheat than paddy rice production. It is noteworthy that the yield still increased by 15% on average after 6 years of biochar application. According to SEM, the yield increase was positively correlated with the application amount of biochar, and the yield increase was higher under low nitrogen (N) input than under high N input. The long-term yield-increasing effect of biochar was more attributable to its enhancement of SOC rather than its effects on soil bulk density and pH.

生物炭应用对作物产量长期影响的全球评估
施用生物炭对作物产量的影响一直是人们关注的话题。然而,目前大多数研究都集中在生物碳对作物生长的短期影响上。研究生物炭对提高作物产量的长期影响对于粮食安全和农业可持续发展至关重要。为解决这一问题,本研究在建立包含 981 组观测数据的数据集的基础上,对元分析和结构方程模型(SEM)进行了耦合。结果表明,生物炭显著而持久地提高了作物产量,在超过 2 年的监测期内,生物炭还显示 SOC 平均增加了 36.2%。长期施用生物炭后,作物产量平均提高了 16%,但不同作物类型的增产幅度不同,施用生物炭对玉米和小麦的增产效果优于水稻。值得注意的是,施用生物炭 6 年后,平均产量仍增加了 15%。根据 SEM 的研究,增产效果与生物炭的施用量呈正相关,低氮投入下的增产效果高于高氮投入下的增产效果。生物炭的长期增产效果更多归因于其对 SOC 的增强,而不是对土壤容重和 pH 值的影响。
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
Current Research in Environmental Sustainability
Current Research in Environmental Sustainability Environmental Science-General Environmental Science
CiteScore
7.50
自引率
9.10%
发文量
76
审稿时长
95 days
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