Linkage of Crop Productivity to Soil Nitrogen Dynamics under Biochar Addition: A Meta-Analysis across Field Studies
Linkage of Crop Productivity to Soil Nitrogen Dynamics under Biochar Addition: A Meta-Analysis across Field Studies
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添加生物炭下作物生产力与土壤氮动态的联系：田间研究的荟萃分析
DOI：
10.3390/agronomy12020247
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Qi Deng
中科院分区：
文献类型：
--
作者：
Leiyi Zhang;Meixia Zhang;Yantao Li;Jianling Li;Yiming Jing;Yangzhou Xiang;Bin Yao;Qi Deng
添加生物炭是改善土壤氮素有效性和提高作物生产力的一种很有前途的解决方案。然而，在添加生物炭的条件下，土壤氮动态对作物生产力的影响尚未得到全面的了解。在此，我们对93个同行评议的田间试验进行了荟萃分析，以综合生物炭添加下作物生产力与土壤氮动态的联系。结果表明：添加生物炭可显著提高作物生产力12.8%，提高植株氮素吸收量22.6%，作物生产力与氮素吸收量呈正相关。添加生物炭可显著提高土壤全氮（TN）、无机氮（IN）、微生物生物量氮（MBN）和生物固氮（BNF）含量3.34 ~ 18.7%，减少一氧化二氮（N2O）排放15.9%。利用聚合增强树模型进一步分析表明，TN和BNF在生物炭诱导的作物生产力变化中起着最重要的作用。添加生物炭条件下，作物产量与全氮呈显著正相关，与BNF呈显著负相关。这些结果表明，添加生物炭可以通过增加土壤氮资源和氮吸收来促进作物生长和生产力，但对于某些固氮作物来说并非如此，可能是因为它们通常受到氮以外的营养物质的限制。
Biochar addition is a promising solution to improve soil nitrogen (N) availability and enhance crop productivity. However, a comprehensive understanding of the impact of soil N dynamics on crop productivity under biochar addition remains elusive. Here, we conducted a meta-analysis from 93 peer-reviewed field experiments to synthesize the linkage of crop productivity to soil N dynamics under biochar addition. The results show that biochar addition significantly enhanced crop productivity by 12.8% and plant N uptake (PNU) by 22.6%, and there was a strongly positive relationship between crop productivity and PNU. Biochar addition also significantly increased the contents of soil total N (TN), inorganic N (IN), microbial biomass N (MBN), and biological N2 fixation (BNF) by 3.34–18.7%, but reduced nitrous oxide (N2O) emission by 15.9%. Further analysis with the aggregated boosted tree model indicated that the TN and BNF played the most important roles in biochar-induced change in crop productivity. However, while crop productivity was positively correlated with TN under biochar addition, it showed a negative correlation with BNF. These findings suggest that biochar addition could enhance crop growth and productivity through increasing the soil N resource and N uptake, but this was not true for some N2-fixing crops, probably because they were usually constrained by nutrients other than N.