Effects of Biochar Amendment on Soil Organic Carbon Fractions Under Simulated Nitrogen Deposition

SONG Kaiyue; YIN Yunfeng; MA Yapei; SHI Siyu; ZHOU Yang; MA Hongliang; GAO Ren

doi:10.13870/j.cnki.stbcxb.2022.02.031

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Effects of Biochar Amendment on Soil Organic Carbon Fractions Under Simulated Nitrogen Deposition

更新时间：2024-11-07

- Effects of Biochar Amendment on Soil Organic Carbon Fractions Under Simulated Nitrogen Deposition
- Vol. 36, Issue 2, Pages: 247-254(2022)
- 作者机构：
  
  1. 福建师范大学地理研究所,福州,350007
  2. 福建师范大学福建省植物生理生态重点实验室,福州,350007
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.02.031
  CLC： X53;S156
- Published：2022
- 稿件说明：
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SONG Kaiyue, YIN Yunfeng, MA Yapei, et al. Effects of Biochar Amendment on Soil Organic Carbon Fractions Under Simulated Nitrogen Deposition[J]. 2022, 36(2): 247-254.
DOI：

SONG Kaiyue, YIN Yunfeng, MA Yapei, et al. Effects of Biochar Amendment on Soil Organic Carbon Fractions Under Simulated Nitrogen Deposition[J]. 2022, 36(2): 247-254. DOI： 10.13870/j.cnki.stbcxb.2022.02.031.

摘要

通过18个月的盆栽试验

以杉木幼苗为研究对象

研究不同水平氮(N)沉降背景下(N0(0)、低N(40 kg/(hm2·a))和高N(80 kg/(hm2·a))生物炭(BC)施用(B0(0)、B1(12 t/hm2)和B2(36 t/hm2))对土壤有机碳(SOC)组分的影响。结果表明:与对照相比

单独施用BC以及N沉降下施用BC均显著增加SOC、难降解性有机碳组分(RPC)和可溶性有机碳 (DOC)含量(P<0.05)

提升幅度分别为40.1%~99.2%

104.0%~267.8%和75.3%~194.7%;酸水解活性有机碳组分(LPC)在SOC中的比例显著降低28.8%~53.3%

RPC/SOC比例显著提高45.7%~84.6%

且均在单施高量BC时效果最为明显。单施BC和单独N沉降对土壤LPC含量的影响并不显著

N沉降下施用高量BC时则显著降低(P<0.05)。单独高N沉降显著降低土壤微生物生物量碳(MBC)含量及MBC/SOC比例

对DOC含量及其比例的影响并不显著

N沉降与高量BC处理使土壤DOC/SOC比例显著增加(P<0.05)。相关分析发现

土壤pH、速效磷(AP)和速效钾(AK)与SOC、RPC以及DOC呈极显著正相关

与LPC呈极显著负相关(P<0.01)。短期内N沉降与BC交互作用对RPC组分的影响最大

有利于提高SOC组分的稳定

增加土壤C库。

Abstract

A pot experiment was conducted to investigate the effects of biochar (BC) amendment (0

36 t/hm2) on soil organic carbon (SOC) and its fractions in a Cunninghamia lanceolata seedling under different simulated levels of nitrogen (N) deposition (0

80 kg/(hm2·a) N) for 18 months. The results indicated that compared with the control

BC amendment significantly increased the contents of SOC

recalcitrant pool of carbon (RPC)

and dissolved organic carbon (DOC) by 40.1%~99.2%

104.0%~267.8% and 75.3%~194.7% under different levels of N deposition (P<0.05)

respectively. Meanwhile

the proportion of labile C from acid hydrolysis (LPC) in SOC decreased significantly by 28.8%~53.3%

and the proportion of RPC in SOC increased significantly by 45.7%~84.6% in the treatments of BC amendment combined with N deposition (P<0.05). The effects were the most significant when higher-rate BC was applied alone (P<0.05). No significant differences were found in the content of LPC in the treatments of BC amendment alone or simulated N deposition alone

whereas LPC was significantly reduced under the higher BC amendment combined with simulated N deposition (P<0.05).The higher rate of simulated N deposition alone significantly decreased soil microbial biomass carbon (MBC) content and the proportion of MBC in SOC

but had no significant effect on the DOC content and the proportion of DOC in SOC. However

the interaction of simulated N deposition and higher rate of BC significantly increased the proportion of DOC in SOC (P<0.05). Correlation analysis suggested that soil pH and available nutrients (AP

AK) were positively correlated with SOC

RPC and DOC contents

and were significantly negatively correlated with LPC (P<0.01). Our results indicated that the interaction between simulated N deposition and BC amendment has the greatest impact on RPC fraction

which is conducive to improving the stability of SOC fractions and increasing soil C storage in the short term.

关键词

Keywords

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