氮添加对典型阔叶红松林凋落叶分解及养分释放的影响

发布时间：2018-11-20 04:45

【摘要】：为探索氮添加对原始阔叶红松林凋落叶分解及养分动态的影响,以红松、枫桦、水曲柳及3个树种混合凋落叶为研究对象,采用凋落物袋法,进行了2年的分解试验。施N水平分别为N0(0 kg/(hm~2·a))、N1(30 kg/(hm~2·a))、N2(60 kg/(hm~2·a))和N3(120 kg/(hm~2·a))。结果表明:施N对混合凋落叶分解影响显著(P0.05)。凋落叶质量残留率与其基质N含量呈显著负相关,与碳含量及C/N比均为显著正相关。施N促进凋落叶N含量升高,凋落叶P含量受时间和N处理交互作用影响显著。施N促进水曲柳凋落叶N、P释放,抑制红松、枫桦和混合凋落叶N、P释放。N3处理抑制红松凋落叶C释放,促进水曲柳凋落叶C释放,N1处理促进水曲柳与混合凋落叶C释放。说明N处理能够调节养分释放模式,并对森林生态系统C及养分循环有显著调控作用。
[Abstract]:In order to explore the effect of nitrogen addition on the litter decomposition and nutrient dynamics of the original broad-leaved Korean pine forest, the mixed litter leaves of Pinus koraiensis, Betula maple, Fraxinus mandshurica and three tree species were studied. The litter bag method was used to decompose the leaves for 2 years. The N levels were N0 (0 kg/ (hm~2 a), N1 (30 kg/) (hm~2 a), N2) 60 kg/ (hm~2 a) and N3 (120 kg/ (hm~2 a).), respectively). The results showed that the effect of N application on leaf decomposition of mixed litter was significant (P0.05). There was a significant negative correlation between leaf mass residue rate and substrate N content, significant positive correlation with carbon content and C / N ratio. Application of N promoted the increase of N content in litter leaves, and P content in litter leaves was significantly affected by time and interaction of N treatments. Application of N promoted the release of NfP from litter leaves of Fraxinus mandshurica, inhibited the release of N P from leaves of Pinus koraiensis, Betula maple and mixed litters. N3 treatment inhibited C release from littered leaves of Pinus koraiensis and promoted C release from littered leaves of Fraxinus mandshurica. N1 treatment promoted C release from Fraxinus mandshurica and mixed littered leaves. The results showed that N treatment could regulate nutrient release pattern and significantly regulate C and nutrient cycling in forest ecosystem.
【作者单位】：东北林业大学生态研究中心;
【基金】：中央高校基本科研业务费专项(DL13EA05)
【分类号】：S714

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