| 马尾松采伐迹地火烧黑炭对土壤有机碳组分和碳转化酶活性的影响 |
| 摘要点击 1615 全文点击 458 投稿时间：2022-09-07 修订日期：2022-09-29 |
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| 中文关键词 黑炭 炼山 土壤微生物量碳 有机碳组分 酶活性 |
| 英文关键词 charcoal broadcast burning soil microbial biomass carbon soil organic carbon fraction enzyme activities |
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| 中文摘要 |
| 黑炭是不完全燃烧生成的具有高度芳香化结构的含碳颗粒物，能对火烧迹地土壤生态功能产生长期影响.i>，分析火后黑炭处理［移除（B0）、单倍（B1）、双倍（B2）］、未火烧对照（UB）5 a后土壤有机碳组分［可溶性有机碳（DOC）、微生物量碳（MBC）、易氧化有机碳（ROC）、惰性有机碳（RC）、粗颗粒有机碳（CPOC）、细颗粒有机碳（FPOC）］含量和碳转化酶［葡萄糖苷酶（BG）、过氧化物酶（POD）、多酚氧化酶（POX）、纤维素酶（CBH）、蔗糖酶（SC）］活性特征.结果表明，B1处理土壤DOC、MBC、CPOC、FPOC和RC含量均显著低于UB （P<0.05）.B2处理土壤MBC和FPOC含量与UB无显著差异，但显著高于B0处理（P<0.001）.B1和B2处理土壤MBC/TC与UB无显著差异，而B0处理土壤MBC/TC显著低于UB （P<0.05）.B0、B1和B2处理土壤BG和POD活性显著低于UB （P<0.01）.B0和B2处理土壤POX活性显著低于对照（P<0.01）.不同黑炭处理土壤TC、DOC、ROC、CPOC和RC含量以及碳转化酶活性无显著差异（P>0.05）.冗余分析（RDA）结果显示，SC和POX活性为土壤有机碳组分含量的主要影响因子，其解释率分别为16.3%和12.7%.结果表明，火烧产生的黑炭能加快火后MBC恢复、促进土壤有机碳累积和提高土壤有机碳稳定性，今后在中亚热带人工林经营管理中应重视对黑炭的利用. |
| 英文摘要 |
| Charcoal is a carbonaceous particulate matter with a highly aromatic structure produced by incomplete combustion, and it can cause persistent long-term effects on soil ecological functions. In this study, we determined soil organic carbon pools and associated enzyme activities following five years of different charcoal treatments[charcoal removal (B0), charcoal retained in situ (B1), and the addition of charcoal removed from B0(B2)] and the unburnt control (UB) in a recently harvested Pinus massoniana plantation subjected to broadcast burning. The results showed that dissolved organic carbon (DOC), microbial biomass carbon (MBC), coarse and fine particulate organic carbon (CPOC and FPOC), and recalcitrant carbon (RC) contents were significantly lower in B1 than those in UB soil (P<0.05). The MBC and FPOC contents of B2 soil were comparable to those of UB soil, which were significantly higher than those of B0 soil (P<0.001). There was no difference in MBC/TC between the B2 and UB soils, whereas MBC/TC was significantly lower in B0 than in UB soil (P<0.05). β-glucosidase and peroxidase activities of B0, B1, and B2 soils were significantly lower than that of UB soil (P<0.01), and polyphenol oxidase activity was significantly lower in B0 and B2 soils than in UB soil (P<0.01). No significant difference in soil TC, DOC, readily oxidized carbon (ROC), CPOC, and RC content as well as associated enzyme activities was observed among the charcoal treatments (P>0.05). Redundancy analysis showed that sucrose and polyphenol oxidase were the key drivers influencing soil organic carbon fractions, accounting for 16.3% and 12.7% of the total variance, respectively. Overall, our findings indicated that fire-deposited charcoal played a positive role in enhancing soil microbial biomass carbon recovery, soil organic carbon accumulation, and stability, highlighting the importance of charcoal in the management of subtropical plantations in the future. |
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