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红松生长和根际土壤酶活性对紫丁香蘑菌剂接种的响应
潘艳艳, 李晓光, 刘立君, 李鸿, 钟鑫, 张义飞
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红松生长和根际土壤酶活性对紫丁香蘑菌剂接种的响应
Response of Pinus Koraiensis Growth and Rhizosphere Soil Enzyme Activity to Lepista nuda Inoculation
通过接种不同剂量的紫丁香蘑(Lepista nuda)菌剂,探讨紫丁香蘑菌剂侵染对红松(Pinus koraiensis)生长及根际土壤酶活性的影响,以期为菌根化红松苗木培育及造林提供技术支撑。以4年生红松幼苗为材料,设置4个菌剂剂量,测定并分析红松幼苗的生长指标、土壤养分含量及根际土壤酶活性,通过相关性分析解析红松生长和根际土壤酶活性对紫丁香蘑菌剂接种的响应特征。结果表明:(1)紫丁香蘑菌剂接种显著促进红松幼苗生长,当菌剂用量为150 g⋅株-1时对红松生长促进效果最好,株高、地径、鲜质量、干质量较对照分别高29.07%、25.69%、38.16%、57.44%,菌根侵染率和根系活力均显著提高。(2)菌剂接种处理下红松根际土壤养分含量均高于对照,施用150 g⋅株-1菌剂时对根际土壤养分提高效果最好,较对照根际土壤的有机质、碱解氮、全氮、全磷和速效磷含量分别高60.67%、31.46%、35.23%、72.22%和35.91%。(3)接种处理提高了红松幼苗根际土壤酶活性,接种菌剂为150 g⋅株-1时,根际土壤酶活性水平最高。(4)相关性分析表明,菌根侵染率与根系活力、干质量、鲜质量、地径、苗高呈显著正相关,与有机质、全磷、全氮、碱解氮含量呈显著正相关,与土壤蔗糖酶、脲酶、酸性磷酸酶活性呈显著正相关。土壤速效磷含量与土壤酸性磷酸酶活性呈显著正相关,土壤碱解氮含量与土壤有机质含量、土壤脲酶活性、土壤酸性磷酸酶活性呈显著正相关。综上,接种紫丁香蘑菌剂对红松幼苗生长具有明显促进作用,不同菌剂接种剂量对红松生长和土壤酶活性的影响存在差异,紫丁香蘑菌剂通过调控土壤酶活性及养分循环,优化红松根际微环境,其中,150 g·株-1为最佳接种剂量,研究结果为菌根化红松苗培育及森林土壤改良提供参考。
This study investigated the effects of Lepista nuda inoculation at different doses on the growth of Pinus koraiensis seedlings and rhizosphere soil enzyme activity, aiming to provide technical support for cultivating mycorrhizal P. koraiensis seedlings and forestation. Four-year-old P. koraiensis seedlings were treated with four doses of L. nuda inoculant. Growth parameters, soil nutrient content, and rhizosphere soil enzyme activity were measured and analyzed. Correlation analysis was conducted to elucidate the responses of seedling growth and soil enzyme activity to L. nuda colonization. Key findings were that: (1)L. nuda colonization significantly enhanced seedling growth, at an optimal dose of 150 g⋅plant-1, plant height, ground diameter, fresh weight, and dry weight increased by 29.07%, 25.69%, 38.16%, and 57.44%, respectively, compared to the control. Mycorrhizal colonization rate and root activity increased significantly in the inoculation treatment compared to the control. (2)Inoculation treatments exhibited higher soil nutrient content than the control, at a dose of 150 g⋅plant-1, the content of soil organic matter, available nitrogen, total nitrogen, total phosphorus, and available phosphorus increased by 60.67%, 31.46%, 35.23%, 72.22%, and 35.91%, respectively. (3)All doses of L. nuda inoculationenhanced rhizosphere soil enzyme activity, with the maximum increment at a dose of 150 g⋅plant-1. (4)Correlation analysis revealed significant positive relationships between mycorrhizal colonization rate and root activity, biomass(dry/fresh weight), growth parameters(height/diameter), the contents of soil organic matter, total nitrogen/phosphorus, available nitrogen, and activities of sucrase, urease, and phosphatase. Soil available phosphorus content was positively correlated with phosphatase activity, while available nitrogen content was positively correlated with content of soil organic matter, and activities of urease and phosphatase. In conclusion, L. nuda inoculation markedly promoted P. koraiensis growth by regulating soil enzyme activity and nutrient cycling, with 150 g⋅plant-1 identified as the optimal inoculation dose. The findings of this study provided valuable references for the cultivation of mycorrhizal P. koraiensis seedlings and improvement of forest soil quality.
紫丁香蘑 / 红松 / 生长指标 / 土壤养分含量 / 土壤酶活性
Lepista nuda / Pinus koraiensis / growth indicators / nutrient content / soil enzyme activity
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