辽东落叶松人工混交林凋落物混合分解特征

发布时间：2018-05-14 00:44

本文选题：落叶松 + 混合分解　；参考：《生态学杂志》2017年11期

【摘要】：凋落物分解过程中的养分释放对土壤质量、养分平衡和生产力的可持续维持发挥着重要作用。2015年5月,以辽东山区日本落叶松(Larix kaempferi)-红松(Pinus koraiensis)和日本落叶松-赤杨(Alnus japonica)人工混交林为研究对象,采用凋落物网袋法将落叶松分别与红松、赤杨叶片凋落物以75∶25、50∶50和25∶75比例混合,研究不同类型、不同比例的混合凋落物对其分解速率以及养分动态变化的影响。结果表明:在单一植物凋落物的分解过程中,赤杨叶片质量损失最高,分解最快;而红松叶片质量损失最低,分解最慢。凋落物混合分解对氮素释放的影响中,3种比例的落叶松与赤杨叶片的混合凋落物均表现出抑制作用,而落叶松与红松叶片混合凋落物(以25∶75比例混合)表现出促进作用。因此,落叶松在与红松、赤杨混合分解时产生了"非加和效应",并且其分解过程中氮和磷的养分释放状况受混合比例影响。
[Abstract]:Nutrient release during litter decomposition plays an important role in soil quality, nutrient balance and sustainable maintenance of productivity. The artificial mixed forests of Larix kaempferian-Pinus koraiensis and Alnus japonica in the mountainous area of Liaodong were used to separate Larix kaempferian-Pinus koraiensis and Korean pine. Leaf litter of Populus tomentosa was mixed with 75: 2550: 50 and 25:75 to study the effects of different types and proportions of mixed litter on its decomposition rate and nutrient dynamic change. The results showed that in the decomposition process of single plant litter, the leaf mass loss of Populus tomentosa was the highest and the decomposition was the fastest, while the weight loss of Korean pine leaf was the lowest and the decomposition was the slowest. Effects of mixed decomposition of litter on nitrogen release the mixed litter of larch and Korean poplar leaves showed inhibitory effect, while the mixed litter of larch and Korean pine leaf (mixed at 25:75) showed a promoting effect. Therefore, Larix gmelini has a "non-additive effect" when decomposing with Pinus koraiensis and Populus tomentosa, and the nutrient release of nitrogen and phosphorus is affected by the mixed ratio during the decomposition process of Larix gmelini.
【作者单位】：中国科学院森林与管理重点实验室(沈阳应用生态研究所);中国科学院大学;吉林长白山西坡森林生态系统定位观测研究站;辽宁省森林经营研究所;吉林省长白山科学研究院;
【基金】：中国科学院重点部署项目(KFZD-SW-305-001) 国家科技支撑计划课题(2012BAD22B04)资助
【分类号】：S714

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