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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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

Received: 15 July 2020

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S714

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	LI Suxin
	ZHANG Yunxiang
	GUO Jinping

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LI Suxin,ZHANG Yunxiang,GUO Jinping. Effects of simulated nitrogen deposition on ecological stoichiometric characteristics of leaf litter in Larix principis-rupprechtii stand[J]. SSWC, 2021, 19(2): 12-18.

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

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