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生态学杂志 ›› 2023, Vol. 42 ›› Issue (4): 780-787.doi: 10.13292/j.1000-4890.202304.010

• 研究报告 • 上一篇    下一篇

华北落叶松人工林土壤有机碳和团聚体稳定性对间伐的响应

郑子潇,王丹阳,胡保安,吴会峰,韩海荣,程小琴*   

  1. (北京林业大学生态与自然保护学院, 北京林业大学森林资源生态系统过程北京市重点实验室, 北京 100083)

  • 出版日期:2023-04-03 发布日期:2023-04-03

Responses of soil organic carbon and aggregate stability to thinning in Larix principis-rupprechtii plantation

ZHENG Zixiao, WANG Danyang, HU Baoan, WU Huifeng, HAN Hairong, CHENG Xiaoqin*#br#

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  1. (School of Ecology and Nature Conservation of Beijing Forestry University, Beijing Key Laboratory for Forest Resources & Ecosystem Processes of Beijing Forestry University, Beijing 100083, China).

  • Online:2023-04-03 Published:2023-04-03

摘要: 土壤团聚体是土壤有机碳的主要载体,其稳定性是土壤质量和肥力的关键指标,对维持土壤有机碳库的稳定性有重要意义。为探究华北落叶松人工林土壤有机碳和团聚体稳定性对间伐的响应,以山西省好地方林场的不同密度调控强度的35年生华北落叶松人工林(1100株·hm-2(HT)、1415株·hm-2(MT)、1850株·hm-2(LT)、2100株·hm-2(CK))为对象,利用干筛法测定了土壤团聚体稳定性(平均质量直径(MWD)、几何平均直径(GMD)、分形维数(D))及不同粒径团聚体土壤有机碳含量,通过回归模型分析土壤团聚体稳定性与土壤有机碳之间的关系。结果表明:(1)间伐对土壤团聚体稳定性有显著影响,在0~10、20~30 cm土层中,MWDGMD分别表现为MT>LT>HT>CK和LT>MT>HT>CK;CK林分在各土层D值最高,在10~30 cm深度土壤中表现显著;>2 mm粒径团聚体主要存在于MT林分中。(2)各土层中,MT林分土壤有机碳含量最高。各土层中,MT林分中>2 mm粒径团聚体土壤有机碳贡献率最高,达45.48%;深层土壤(20~30 cm)中土壤有机碳含量与团聚体稳定性呈正相关。因此,适当间伐利于提升土壤有机碳含量及土壤团聚体稳定性。土壤有机碳主要储存在>2 mm粒径团聚体中。从提升土壤有机碳及团聚体稳定性角度,建议将该地35年生华北落叶松人工林密度控制在1415株·hm-2


关键词: 华北落叶松人工林, 土壤有机碳, 平均质量直径, 几何平均直径, 林分密度

Abstract: Soil aggregate is the main carrier of soil organic carbon. Its stability is the key index of soil quality and fertility, which has great significance to maintaining the stability of soil organic carbon pool. In this study, the responses of soil organic carbon and stability of soil aggregates to thinning were investigated based on an experiment with four stand densities \[1100 trees·hm-2 (high thinning, HT), 1415 trees·hm-2 (moderate thinning, MT), 1850 trees·hm-2 (light thinning, LT), and 2100 trees·hm-2 (CK)\] of 35-year-old Larix principis-rupprechtii plantation in Haodifang Forest Farm, Shanxi Province. The stability of soil aggregates \[mean weight diameter (MWD), geometric mean diameter (GMD), fractal dimension (D)\] and the content of soil organic carbon in aggregates with different particle sizes were measured by dry-sieving method. A regression model was used to analyze the relationship between soil aggregate stability and soil organic carbon content. The results showed that: (1) Thinning had significant influence on the stability of soil aggregates. At the depths of 0-10 cm and 20-30 cm, the orders of MWD and GMD were MT>LT>HT>CK and LT>MT>HT>CK, respectively. The CK stands had the highest D value in each soil layer, but the difference was statistically significant only in the soil depth of 10-30 cm. Aggregates with particle size of >2 mm mainly existed in MT stands. (2) In each soil layer, the content of soil organic carbon was the highest in MT stands. The contribution rate of soil organic carbon in MT stands with particle size >2 mm was the highest, up to 45.48%. The content of soil organic carbon in deep soil layer (20-30 cm) was positively correlated with aggregate stability. Therefore, proper thinning was conducive to increasing soil organic carbon content and improving soil aggregate stability. Soil organic carbon was mainly stored in >2 mm particle size aggregates. From the perspective of improving soil organic carbon and aggregate stability, it is suggested that the density of 35-year-old L. principis-rupprechtii plantation should be controlled at 1415 trees·hm-2.


Key words: Larix principis-rupprechtii plantation, soil organic carbon, mean weight diameter, geometric mean diameter, stand density.