Biochar more than stubble management affected carbon allocation and persistence in soil matrix: a 9-year temperate cropland trial

文献类型： 外文期刊

第一作者： Zhang, Aiping

作者： Zhang, Aiping;Wang, Xiao;Wu, Di;Du, Zhangliu;Fang, Yunying;Sun, Xueyang;Tavakkoli, Ehsan;Li, Yuyi

作者机构：

关键词： Soil organic carbon; Chemically recalcitrant carbon; Particulate organic matter; Mineral-associated organic matter

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.6； 五年影响因子：3.8 ）

ISSN： 1439-0108

年卷期： 2023 年 23 卷 8 期

页码：

收录情况： SCI

摘要： PurposeBiochar application to soil has gained great interest as a land-based climate change mitigation solution. However, it lacks long-term field assessment on the effectiveness of biochar compared with other widely applied land management-such as stubble retention-on soil organic carbon (SOC) accumulation and carbon (C) distribution and persistence in the soil matrix.Materials and methodHere, we conducted a 9-year field trial in a temperate agroecosystem of North China to identify and quantify the location of C residing in the soil matrix (determined by two physical fractionation methods), as affected by land management-stubble removed (control), stubble returned at 15 t ha(-1) year(-1) (SR), two biochar doses at 4.5 t ha(-1) year(-1) (B4.5; equivalent to feedstock in SR) and 9.0 t ha(-1) year(-1) (B9.0).Results and discussionThe results showed that biochar application significantly increased SOC in the free and occluded particulate organic matter (POM) and mineral-associated organic matter (MAOM) fractions. Compared to B4.5 and B9.0, SR was less effective in soil C accrual in the occluded POM and MAOM, although the largest increase of C occurred in the free POM (about 10-17 g kg(-1) soil). Consistent with this, biochar rather than stubble retention significantly increased C in (i) coarse POM (i.e., unprotected POM, > 250 mu m) by 190-210%, (ii) microaggregates (mu Agg) by 56-70%, and (iii) MAOM in silt-clay fraction (iMAOM) by 4-12%, but the biochar dose effect was statistically insignificant. Importantly, biochar significantly increased chemically recalcitrant C in soils that were further protected in the mu Agg and iMAOM fractions.ConclusionsWe conclude that biochar application was more beneficial for SOC accumulation and preservation than stubble management, particularly in the microaggregates and organo-mineral complexes, under the intensive cropping systems.

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