|
| 蚯蚓和细菌对秸秆混粪改良苏打盐碱土碳转化及微生物群落的影响 |
| Effects of earthworms and bacteria on carbon transformation and microbial community of soda saline-alkali soil by improvements of straw and manure mixture |
| 投稿时间：2022-01-13 |
| DOI：10.13254/j.jare.2022.0021 |
| 中文关键词: 蚯蚓，类芽孢杆菌，苏打盐碱土，土壤有机碳，水溶性有机碳，三维荧光，微生物群落结构 |
| 英文关键词: earthworm, Paenibacillus sp., soda saline-alkali soil, soil organic carbon, water-soluble organic carbon, three-dimensional fluorescence, microbial community structure |
| 基金项目:国家重点研发计划课题（2018YFD0300208）；吉林省教育厅项目（JJKH20220354KJ） |
|
| 摘要点击次数: 1075 |
| 全文下载次数: 764 |
| 中文摘要: |
| 为了促进苏打盐碱土中有机物料的转化，优化微生物群落结构，提高有机碳含量，利用蚯蚓（Pheretima guillelmi）和外源微生物（类芽孢杆菌C1）研究二者在单一或联合作用下对苏打盐碱土中水稻秸秆和牛粪混合物的降解、有机碳转化以及土壤微生物群落结构的影响。结果表明，蚯蚓、菌株C1单一和联合作用下，水稻秸秆和牛粪混合物的降解率分别提高了66.0%、40.9%和72.1%，土壤有机碳（SOC）含量分别增加了65.8%、18.2%和25.5%，水溶性有机碳（WEOC）含量分别提高了63.5%、1.6%和26.3%。蚯蚓、菌株C1单一和联合作用均能使WEOC的前体物从植物源向微生物源转化，从而增加类溶解性微生物代谢产物的比例；蚯蚓还可以促进WEOC中类腐植酸物质的生成，降低土壤的老化程度，并且与菌株C1之间存在协同效应。蚯蚓、菌株C1单一和联合作用均能够增加真菌的丰富度、多样性以及具有纤维素降解能力的子囊菌群的相对丰度。在属水平上，蚯蚓的作用与土壤中SOC、WEOC含量和WEOC紫外吸收特征值呈正相关。研究表明，蚯蚓与菌株C1单一或联合作用能够使土壤微生物群落结构向更有利于有机物料转化的功能方向转变，进而促进有机物料的降解，提高SOC的含量和稳定性。因此，蚯蚓和菌株C1在苏打盐碱土改良方面具有重要的应用潜力。 |
| 英文摘要: |
| To promote the transformation of organic materials in soda saline-alkali soil, optimize microbial community structure, and increase organic carbon content, single and combined effects of earthworms (Pheretima guillelmi) and exogenous microorganisms (Paenibacillus sp. C1) on the degradation of a mixture of rice straw and manure, soil organic carbon (SOC) transformation, and soil microbial community structure were assessed in soda saline-alkali soil. Earthworms alone, strain C1 alone, and both in combination increased the degradation rates of the rice straw and manure mixture by 66.0%, 40.9% and 72.1%, respectively. SOC was increased by 65.8%, 18.2% and 25.5%, respectively. Water-soluble organic carbon (WEOC) content was increased by 63.5%, 1.6% and 26.3%, respectively. Earthworms and strain C1 could transform WEOC precursors from plant sources to microbial sources, which increased the proportion of soluble microbial metabolites. In addition, earthworms could also promote the production of humic acid-like substances in WEOC and reduce soil aging, with a synergistic effect evident with strain C1. Both the single and joint actions of earthworms and strain C1 could increase the abundance and diversity of fungi and the relative abundance of cellulose-degrading ascomycetes. At the genus level, the effect of earthworms was positively correlated with SOC and WEOC contents in soil and the ultraviolet absorption characteristics of WEOC. The collective findings indicate that the single and joint action of earthworms and strain C1 could change the soil microbial community structure in a functional direction more conducive to the transformation of organic materials, further promoting the degradation of organic materials and the generation of SOC, and improving the formation of soil humic substances. Earthworms and strain C1 thus have important application potentials in the improvement of soda saline-alkali soil. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
