模拟氮沉降对华北落叶松林凋落叶生态化学计量特征的影响

doi:10.16843/j.sswc.2021.02.002

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摘要为探索氮沉降对不同起源华北落叶松林凋落叶生态化学计量的影响，在山西关帝山林区进行4年的野外定点模拟氮沉降试验，设置氮沉降梯度分别为0，8和15 g/（m²·a），研究不同浓度氮添加对其凋落叶C、N、P质量分数及生态化学计量特征的影响。结果表明：1）华北落叶松天然林凋落叶轻度氮处理下C、N质量分数分别显著增加5.9%和9.0%，重度氮处理下P显著降低7.8%；人工林轻度氮处理下C、N、P分别显著增加4.3%、16.3%和4.9%，重度氮处理下N显著增加14.8%，P显著降低13.4%；2）轻度氮处理显著降低天然林和人工林C：N，重度氮处理显著增加C：P和N：P；3）相关性分析表明：天然林凋落叶C与土壤C、N、P，凋落叶N与土壤C、N、C：P、N：P呈正相关；人工林凋落叶C与土壤C，N与土壤N、P，P与土壤C、C：N、C：P呈正相关。总之，氮添加对凋落叶生态化学计量特征影响不同，存在氮添加与林分起源的交互作用，相比较天然林，人工林凋落叶对氮沉降的响应更显著。

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	李素新
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关键词 ：华北落叶松林, 天然林, 人工林, 氮沉降, 凋落叶, 生态化学计量

Abstract：[Background] Nitrogen deposition influences both above- and below-ground communities and influences ecosystem functioning. However it is not clear about ecological stoichiometric characteristics on leaf litter of different stands origins in response to nitrogen deposition. Studying the ecological stoichiometric characteristics of leaf litter in different stands origins is conducive to understanding the nutrient transport mechanism of leaf litter in response to nitrogen addition and providing theoretical basis for nitrogen deposition changes on nutrient cycling. [Methods] We selected 3 replicate plots (20 m×30 m) within natural and plantation Larix principis-rupprechtii forests respectively, each of which was separated by over 10 m. Within each replicate plot, we setup 3 different gradient nitrogen addition: control (CK: without nitrogen addition), light N level (LN:8 g/(m²·a)), and heavy N level (HN:15 g/(m²·a)). Then we collected fresh leaf litters from September to November in 2016 and 0-10 cm soils from August to October in 2016 to determine their C,N and P contents,using one-way ANOVA, two-way ANOVA and Pearson correlation analysis to explore the leaf litter and soil ecological stoichiometric characteristics of 2 stands. [Results] 1) The content of C and N in the leaf litter of the natural Larix principis-rupprechtii forest increased by 5.9% and 9.0% under the light nitrogen treatment, and P decreased by 7.8% in the severe nitrogen treatment. The content of C, N and P in the plantation leaf litter increased by 4.3%, 16.3% and 4.9% respectively in the light nitrogen treatment, and increased 14.8% and 13.4% in the severe nitrogen treatment. 2) The light nitrogen treatment significantly let to the decrease of C:N in the natural forest and plantation, and the severe nitrogen treatment significantly increased C:P and N:P. 3) Correlation analysis showed that leaf litter C in the natural forest was positively correlated with soil C, N and P, and N was positively correlated with soil C, N, C:P, and N:P. The leaf litter C and soil C, leaf litter N and soil N and P, leaf litter P and soil C, C:N, and C: P in the plantation were positively correlated. [Conclusions] The effects of nitrogen addition on the ecological stoichiometric characteristics of leaf litter vary. There is interaction between nitrogen addition and stand origin. Compared with the natural forest, the response of leaf litter in the plantation is more significant. Light nitrogen deposition may promote the enrichment of C and N, and severe nitrogen deposition may release P under the natural forest. Light nitrogen deposition may promote the enrichment of C, N, and P, and severe nitrogen deposition may promote N enrichment and release P under the plantation.

Key words： Larix principis-rupprechtii natural forest plantation nitrogen deposition leaf litter ecological stoichiometric characteristics

收稿日期: 2020-07-15

PACS:

S714

基金资助:山西省面上青年基金项目"模拟氮沉降对不同起源华北落叶松林细根-叶-土壤化学计量的影响"（201901D211358）；山西省研究生教育创新项目"模拟氮沉降对不同起源华北落叶松细根生物量和化学元素计量的动态影响"（2018BY064）

通讯作者: 郭晋平(1963-),男,教授,博士生导师。主要研究方向:森林生态与森林培育。E-mail:jinpguo@126.com E-mail: jinpguo@126.com

作者简介: 李素新(1981-),女,博士研究生。主要研究方向:森林生态与森林培育。E-mail:SXL362@163.com

引用本文:

李素新, 张芸香, 郭晋平. 模拟氮沉降对华北落叶松林凋落叶生态化学计量特征的影响[J]. 中国水土保持科学, 2021, 19(2): 12-18.
LI Suxin, ZHANG Yunxiang, GUO Jinping. Effects of simulated nitrogen deposition on ecological stoichiometric characteristics of leaf litter in Larix principis-rupprechtii stand. SSWC, 2021, 19(2): 12-18.

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http://journal12.magtechjournal.com/Jweb_stbc/CN/10.16843/j.sswc.2021.02.002 或 http://journal12.magtechjournal.com/Jweb_stbc/CN/Y2021/V19/I2/12

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