土壤细胞外氧化酶介导的施氮对生物能源农田土壤有机碳固存的影响,Global Change Biology Bioenergy

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土壤细胞外氧化酶介导的施氮对生物能源农田土壤有机碳固存的影响
Global Change Biology Bioenergy ( IF 5.9 ) Pub Date : 2021-05-16 , DOI: 10.1111/gcbb.12860
Jianjun Duan _{1,

2} , Min Yuan _{1,

3} , Siyang Jian ₄ , Lahiru Gamage ₁ , Madhav Parajuli ₁ , Kudjo E Dzantor ₁ , Dafeng Hui ₅ , Philip A. Fay ₆ , Jianwei Li ₁

Affiliation

氮 (N) 施肥显着影响土壤细胞外氧化酶，负责分解缓慢周转和顽固的土壤有机碳 (SOC；例如，木质素)，并因此影响土壤固碳能力。然而，尚不清楚土壤氧化酶如何在施氮下介导 SOC 固存，以及这些影响是否与植物类型（例如，生物能源作物种类）共同变化。在柳枝稷（SG：Panicum virgatum L.）和gamagrass（GG：Tripsacum dactyloides L.）农田的三种施肥处理下，使用空间明确的设计和集约化土壤采样策略，我们量化了多酚氧化酶（PHO）、过氧化物酶（PER）的活性)，以及它们与顽固性 C 获取 ( OX )相关的总和。施肥处理包括无氮肥输入（NN）、低氮输入（LN：84 kg N ha ^-1 年^-1尿素）和高氮输入（HN：168 kg N ha ^-1 年^-1在尿素中）。除了土壤氧化酶和 SOC（以前发表）之间的相关性之外，描述性和地质统计学方法都被用于评估施氮和作物类型对土壤氧化酶活性及其空间分布的影响。结果表明，所有处理中土壤氧化酶活性与 SOC 之间均呈显着负相关。在施氮条件下，土壤氧化酶和 SOC 的负相关关系也很明显。首先，LN 显着抑制了平均活性和空间异质性的氧化酶，这对应于 SG 中 SOC 的增加（尽管增加了 5.4%）。LN 轻微影响氧化酶活性及其空间异质性，与 GG 中 SOC 的微弱变化一致。其次，HN 表现出土壤氧化酶活性降低的趋势，这与两个农田中显着增强的 SOC 一致。总体而言，这项研究表明，土壤氧化酶活性作为生物能源农田 SOC 封存的敏感和负面介质，优化肥料使用，尤其是柳枝稷农田，可以提高碳封存和环境效益。

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Soil extracellular oxidases mediated nitrogen fertilization effects on soil organic carbon sequestration in bioenergy croplands

Nitrogen (N) fertilization significantly affects soil extracellular oxidases, agents responsible for decomposition of slow turnover and recalcitrant soil organic carbon (SOC; e.g., lignin), and consequently influences soil carbon sequestration capacity. However, it remains unclear how soil oxidases mediate SOC sequestration under N fertilization, and whether these effects co-vary with plant type (e.g., bioenergy crop species). Using a spatially explicit design and intensive soil sampling strategy under three fertilization treatments in switchgrass (SG: Panicum virgatum L.) and gamagrass (GG: Tripsacum dactyloides L.) croplands, we quantified the activities of polyphenolic oxidase (PHO), peroxidase (PER), and their sum associated with recalcitrant C acquisition (OX). The fertilization treatments included no N fertilizer input (NN), low N input (LN: 84 kg N ha⁻¹ year⁻¹ in urea), and high N input (HN: 168 kg N ha⁻¹ year⁻¹ in urea). Besides correlations between soil oxidases and SOC (formerly published), both descriptive and geostatistical approaches were applied to evaluate the effects of N fertilization and crop type on soil oxidases activities and their spatial distributions. Results showed significantly negative correlations between soil oxidase activities and SOC across all treatments. The negative relationship of soil oxidases and SOC was also evident under N fertilization. First, LN significantly depressed oxidases in both mean activities and spatial heterogeneity, which corresponded to increased SOC in SG (though by 5.4%). LN slightly influenced oxidases activities and their spatial heterogeneity, consistent with insignificant changes of SOC in GG. Second, HN showed trends of decrease in soil oxidase activities, which aligned with the significantly enhanced SOC in both croplands. Overall, this study demonstrated that soil oxidase activities acted as sensitive and negative mediators of SOC sequestration in bioenergy croplands and optimizing fertilizer use particularly in switchgrass cropland can improve for both carbon sequestration and environmental benefit.

更新日期：2021-07-12

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