| 刺槐林恢复过程中土壤微生物碳降解酶的变化及与碳库组分的关系 |
| 摘要点击 2417 全文点击 561 投稿时间：2021-07-01 修订日期：2021-07-21 |
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| 中文关键词 人工刺槐林 碳降解酶 碳库组分 微生物呼吸 微生物熵值 偏最小二乘路径模型(PLS-PM) |
| 英文关键词 Robinia pseudoacacia plantations carbon-degrading enzyme carbon pool components microbial respiration microbial entropy partial least squares-path model (PLS-PM) |
| 作者 | 单位 | E-mail | | 李文杰 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | 18238632667@163.com | | 张祯皎 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | | | 赵雅萍 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | | | 许淼平 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | | | 任成杰 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | | | 杨改河 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | | | 冯永忠 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | | | 任广鑫 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | | | 王晓娇 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | | | 韩新辉 | 西北农林科技大学农学院, 杨凌 712100
陕西省循环农业工程技术研究中心, 杨凌 712100 | hanxinhui@nwsuaf.edu.cn |
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| 中文摘要 |
| 为揭示黄土高原人工刺槐林恢复过程中土壤微生物碳降解酶活性的变化特征及与碳组分的响应关系，研究该区域不同恢复年限刺槐林土壤碳库组分、碳降解酶活性、微生物呼吸及其熵值的特征，探讨土壤微生物碳降解酶的变化及与碳库组分的关系.结果表明，微生物呼吸（MR）随刺槐林龄增加呈先增加后减小趋势，微生物代谢熵（qCO2）随刺槐林龄增加而显著下降，微生物熵（qMB）则相反；土壤碳降解酶在恢复初期显著增加，但在恢复后期氧化酶（酚氧化酶PO+过氧化物酶PER）和纤维二糖水解酶（CBH）活性均有不同程度地降低.土壤有机碳和惰性有机碳含量随刺槐林龄增加显著增加，活性有机碳无显著差异.相关性分析和偏最小二乘路径模型表明，土壤碳降解酶、碳库组分同微生物呼吸及其熵值（qCO2和qMB）存在着显著相关关系，水解酶（BG+CBH）与土壤有机碳、微生物量碳、微生物熵、惰性和活性有机碳呈极显著正相关，氧化酶（PO+PER）与黏粒和微生物呼吸显著正相关；惰性有机碳是植被恢复影响土壤微生物代谢的关键环节.综上所述，人工刺槐林生态系统会随恢复年限的增加逐渐稳定，并对土壤的碳汇具有积极的正效应.结果将有助于深入了解脆弱生境区域土壤碳库转化规律及调控机制，以期为黄土高原植被恢复和经营管理提供科学依据. |
| 英文摘要 |
| To reveal the change in the characteristics of soil microbial C-degrading enzyme activities and the response to the components of C during the restoration process of Robinia pseudoacacia forests in the Loess Plateau, the components of the soil C pool, C-degrading enzyme activities, and microbial metabolic entropy of R. pseudoacacia in different restoration stages were studied, and the response relationship between C-degrading enzymes and soil C components was explored. The results showed that the microbial respiration (MR) first increased and then decreased with the restored years. We found that the microbial metabolic entropy (qCO2) decreased significantly with the restored years, but the microbial entropy (qMB) increased. Soil C-degrading enzymes increased significantly in the early-stage restoration of R. pseudoacacia; however, oxidizing enzymes (PO and PER) and cellobiohydrolase (CBH) decreased in the late stage of restoration. The soil organic C and recalcitrant organic C increased significantly with the restored years; however, there was no significant difference for the labile organic C. Correlation analysis and the partial least squares-path model (PLS-PM) showed that soil C-degrading enzymes and C components were significantly correlated with microbial respiration and entropy (qCO2 and qMB), respectively. The hydrolytic enzyme (BG+CBH) was significantly positively correlated with SOC, microbial biomass C, qMB, and recalcitrant and labile organic C. The oxidizing enzyme (PO+PER) was significantly positively correlated with the soil clay and qCO2. In addition, the recalcitrant organic C was the key driver of soil microbial metabolism affected by vegetation restoration. Overall, the ecosystem of R. pseudoacacia plantations would gradually stabilize with the increase in restored years and significantly increase the sequestration effect of soil C. These results will be helpful to understand the transformation rule and regulation mechanism of the soil C pool in vulnerable habitats and provide scientific basis for the restoration and management of vegetation in the Loess Plateau. |
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