胡文杰, 韦秋思, 刘世男, 等. 不同林分密度对西南桦人工林根际与非根际土壤养分的影响[J]. 西南林业大学学报(自然科学), 2025, 45(2): 1–10. DOI: 10.11929/j.swfu.202403065
引用本文: 胡文杰, 韦秋思, 刘世男, 等. 不同林分密度对西南桦人工林根际与非根际土壤养分的影响[J]. 西南林业大学学报(自然科学), 2025, 45(2): 1–10. DOI: 10.11929/j.swfu.202403065
Hu Wenjie, Wei Qiusi, LIU Shinan, CHENG Fei, HUANG Chaoming, YANG Mei. Rhizosphere and non-rhizosphere soil nutrient characteristics of Betula alnoides forest in southwest China with different stand densities[J]. Journal of Southwest Forestry University. DOI: 10.11929/j.swfu.202403065
Citation: Hu Wenjie, Wei Qiusi, LIU Shinan, CHENG Fei, HUANG Chaoming, YANG Mei. Rhizosphere and non-rhizosphere soil nutrient characteristics of Betula alnoides forest in southwest China with different stand densities[J]. Journal of Southwest Forestry University. DOI: 10.11929/j.swfu.202403065

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不同林分密度对西南桦人工林根际与非根际土壤养分的影响

Rhizosphere and non-rhizosphere soil nutrient characteristics of Betula alnoides forest in southwest China with different stand densities

  • 摘要: 以4种不同林分密度(A:400株/hm2、B:1000株/hm2、C:1367株/hm2、D:2025株/hm2)15年生西南桦林为研究对象,分析2个土层(0~20 cm、20~40 cm)根际与非根际土壤养分指标,利用方差分析、相关性及主成分分析对土壤质量进行综合评价。结果表明:2个土层的根际土壤pH、全钾均在林分密度A时达到最大,pH分别为4.54、4.31,全钾为19.49 g/kg、17.09 g/kg,其余养分指标则在林分密度B时达到最大,显著高于其他3个林分;20~40 cm非根际土壤全钾在A林分含量最高,为16.67 g/kg,其他养分指标在林分密度B时均达到最大值;不同林分密度的根际效应表现为4个林分的pH均为负效应,林分密度A、B、C的养分指标整体为正效应,D林分的根际效应除全氮、有机质、全钾为正效应外,其他指标为负效应;相关性结果表明,根际与非根际土壤养分指标整体与有机质含量呈显著正相关;主成分分析表明,林分密度对土壤有机质、全氮、全磷的影响最大。1000株/hm2林分密度下西南桦人工林根际与非根际养分含量较丰富,建议在生产中将西南桦林分密度控制在1000株/hm2左右。

     

    Abstract: Due to the complex interaction process between roots and soil of trees, the effects of stand density on rhizosphere and non-rhizosphere soil may be different. Based on this, the effects of different stand densities on rhizosphere and non-rhizosphere soil nutrients in Betula alnoides plantation were explored, and the characteristics of rhizosphere and non-rhizosphere nutrients under different stand densities were clarified, providing theoretical basis for screening reasonable densities of Betula alnoides plantation. Four kinds of Betula alnoides forests with different stand density of 15 year were selected as the research object, and their densities were(A:400 plants/hm2, B:1000 plants/hm2, C:1367 plants/hm2, D:2025 plants/hm2), respectively. Soil nutrient of rhizosphere and non-rhizosphere soils in different soil layers(0-20 cm, 20-40 cm) were analyzed. The soil quality was evaluated by variance analysis and correlation analysis. 1. The rhizosphere soil pH and total potassium of the two soil layers reached the maximum at stand density A, pH was 4.54 and 4.31, and total potassium was 19.49 g/kg and 17.09 g/kg, respectively. The remaining nutrient indexes reached the maximum at stand density B, which was significantly higher than that of the other three stands. 2. The total potassium content of 20-40 cm non-rhizosphere soil was the highest in stand A(16.67 g/kg), and the other nutrient indexes of non-rhizosphere soil reached the maximum at stand density B; 3. The rhizosphere effects of different stand densities showed that pH of the four stands was negative, the nutrient indexes of stand A, B and C were positive as a whole, and the rhizosphere effects of stand D were negative except for total nitrogen, organic matter and total potassium. 4. Correlation results showed that rhizosphere and non-rhizosphere soil nutrient indexes were significantly positively correlated with organic matter content as a whole. Principal component analysis showed that stand density had the greatest influence on soil organic matter, total nitrogen and total phosphorus. With 1000 plants/hm2 stand density, the rhizosphere and non-rhizosphere nutrient content of Southwest birch plantation is rich, and the density of southwest birch plantation can be controlled at about 1000 plants/hm2 during production.

     

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