不同类型毛竹林土壤团聚体有机碳特征研究

发布时间：2018-05-18 13:17

本文选题：毛竹林 + 不同类型　；参考：《江西农业大学学报》2017年04期

【摘要】：对江西安福林区毛竹纯林、竹阔和竹杉混交林土壤团聚体组成的分布及有机碳含量、与土壤总有机碳的关系和贡献率等土壤团聚体特征进行研究。结果表明,不同类型毛竹林土壤团聚体含量的分布趋势为随着土壤团聚体粒径减小而下降,粒径0.25 mm团聚体含量平均值由大到小依次为竹杉混交林、竹阔混交林和毛竹纯林。土壤团聚体有机碳含量平均值由大到小依次为(2~1 mm)、(5 mm)、(1~0.5 mm)、(5~2 mm)和(0.5~0.25 mm)。0.25 mm团聚体有机碳含量平均值以竹阔混交林最高,为32.43 g/kg,其次是毛竹纯林(26.99 g/kg),竹杉混交林最低,为21.18 g/kg,且均随着土层深度的增加而显著减少。不同类型毛竹林土壤团聚体有机碳与总有机碳呈显著正相关,且各粒径团聚体间有机碳含量均呈极显著正相关。粒径5 mm和5~2 mm团聚体有机碳的贡献率在47.74%~75.60%,由大到小依次表现为竹杉混交林、竹阔混交林和毛竹纯林,说明混交经营有利于大粒径团聚体中有机碳的积累。研究结果可为我国亚热带地区毛竹林资源的合理经营提供科学依据。
[Abstract]:The distribution of soil aggregate composition and the content of organic carbon in pure bamboo forest, bamboo-broad-leaved and bamboo-fir mixed forest in Anfu forest area of Jiangxi Province were studied. The relationship and contribution rate between soil aggregate composition and total organic carbon (TOC) were studied. The results showed that the distribution trend of soil aggregate content in different types of Phyllostachys pubescens forest decreased with the decrease of soil aggregate diameter. The average value of soil aggregate content from large to small was bamboo and fir mixed forest, bamboo-broad-leaved mixed forest and pure bamboo forest. The average organic carbon content of soil aggregates from big to small was 2 ~ 2 ~ 1 mm ~ 1 mm ~ 5 mm ~ (5 mm) and 0. 5 mm ~ 0. 5 mm ~ 0. 5mm ~ (2 mm). The average value of organic carbon content of 0. 5 ~ 0. 5 mm).0.25 / mm aggregate was the highest in bamboo-broad-leaved mixed forest (32.43 / g / kg), followed by pure forest of Phyllostachys pubescens with 26.99 g / kg 路kg ~ (-1) of bamboo-fir forest, and the lowest in bamboo-fir mixed forest. It was 21.18 g / kg and decreased significantly with the increase of soil depth. There was a significant positive correlation between soil aggregate organic carbon and total organic carbon in different types of bamboo forest, and there was a very significant positive correlation between the content of organic carbon among different aggregates. The contribution rate of organic carbon of 5 mm and 5 ~ 2 mm aggregates was 47.74 ~ 75.60%, and the order from big to small was bamboo and fir mixed forest, bamboo and broad-leaved mixed forest and pure bamboo forest, which indicated that mixed management was beneficial to the accumulation of organic carbon in large particle aggregate. The results can provide scientific basis for rational management of Phyllostachys pubescens forest resources in subtropical regions of China.
【作者单位】：江西省林业科学院;国际竹藤中心;
【基金】：国家林业公益性行业专项(201404408) 国家“十二五”科技支撑计划项目(2012BAD23B04)~~
【分类号】：S714.2

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