间伐对红松人工林土壤胞外酶活性及其化学计量比的影响

doi:10.13287/j.1001-9332.202602.001

摘要/Abstract

摘要： 以张广才岭红松人工林为研究对象,设置间伐强度0(对照)、10%(弱度间伐)、20%(中度间伐)和30%(强度间伐),分析不同间伐下土壤胞外酶活性及其化学计量比的季节动态(5、7和9月)。结果表明: 间伐处理提高了土壤水解氮、有效磷和有效钾含量,以及纤维二糖水解酶、β-葡萄糖苷酶、N-乙酰-β-氨基葡萄糖苷酶和酸性磷酸酶活性;除酸性磷酸酶活性在5月最高外,其余酶活性均在7月达到峰值。7月酶化学计量比(E_C∶N∶P=1∶0.83∶1.13)低于5月(E_C∶N∶P=1∶0.91∶1.30)和9月(E_C∶N∶P=1∶0.91∶1.26),与弱度间伐和强度间伐相比,中度间伐强度下土壤胞外酶化学计量比较小,并呈现磷限制缓解而碳限制加强的情况。相关性分析表明,土壤有机质、水解氮、有效磷和有效钾是影响土壤胞外酶活性及化学计量比的重要因素。中度间伐强度能显著改善该地区红松人工林土壤养分,提高胞外酶活性并缓解磷限制。

关键词: 红松人工林, 间伐, 土壤胞外酶活性, 化学计量比

Abstract: We analyzed the seasonal dynamics (May, July, and September) of soil extracellular enzyme activity and its stoichiometric ratio in Pinus koraiensis plantations in Zhangguangcai Ridge, under thinning intensities of 0 (control), 10% (weak thinning), 20% (moderate thinning), and 30% (heavy thinning). The results showed that thinning increased the content of soil hydrolyzed nitrogen, available phosphorus, and available potassium, as well as the activities of cellulase, β-glucosidase, N-acetyl-β-glucosidase, and acid phosphatase. Except for the highest acid phosphatase activity in May, all enzyme activities reached their peak in July. The enzyme stoichiometry ratio (E_C:N:P=1:0.83:1.13) in July was lower than that in May (E_C:N:P=1:0.91:1.30) and September (E_C:N:P=1:0.91:1.26). Compared with weak and heavy thinning, the soil extracellular enzyme stoichiometry ratio was sma-ller under moderate thinning intensity, phosphorus limitation was alleviated, and carbon limitation was strengthened. Soil organic matter, hydrolyzed nitrogen, available phosphorus, and available potassium were important factors affecting soil extracellular enzyme activity and stoichiometry. Moderate thinning intensity could significantly improve soil nutrients, increase extracellular enzyme activity, and alleviate phosphorus limitation in P. koraiensis plantations.

Key words: Pinus koraiensis plantation, thinning, soil extracellular enzyme activity, stoichiometric ratio

杨叶磊, 温海瑞, 杨雨春, 矫春晶, 马畅, 王芳, 王君, 刘月. 间伐对红松人工林土壤胞外酶活性及其化学计量比的影响[J]. 应用生态学报, 2026, 37(2): 409-416.

YANG Yelei, WEN Hairui, YANG Yuchun, JIAO Chunjing, MA Chang, WANG Fang, WANG Jun, LIU Yue. Effects of thinning on soil extracellular enzyme activities and their stoichiometric ratios in Pinus koraiensis plantations[J]. Chinese Journal of Applied Ecology, 2026, 37(2): 409-416.

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