Moso bamboo expansion reduced soil N2O emissions while accelerated fine root litter decomposition: contrasting non-additive effects

被引:5
作者
Pan, Jun [1 ,2 ]
Liu, Yuanqiu [1 ,3 ]
Niu, Jiehui [1 ,4 ]
Fang, Haifu [1 ]
Feng, Yan [3 ]
Bai, Tianjun [3 ]
Zhang, Mi [3 ]
Deng, Wenping [1 ]
Siemann, Evan [5 ]
Zhang, Ling [1 ,3 ]
机构
[1] Jiangxi Agr Univ, Coll Forestry, Key Lab Silviculture, Nanchang 330045, Jiangxi, Peoples R China
[2] Beijing Forestry Univ, Coll Ecol & Nat Conservat, Beijing 100083, Peoples R China
[3] Lushan Natl Observat & Res Stn Chinese Forest Eco, Jiujiang 332900, Peoples R China
[4] Bur Agr & Rural Affairs, Jiaozuo 454100, Henan, Peoples R China
[5] Rice Univ, Dept Biosci, Houston, TX 77005 USA
基金
中国国家自然科学基金;
关键词
Moso bamboo expansion; Nitrogen deposition; Litter mixture; Fine root; Nitrous oxide; Synergistic non-additive effect; CINNAMOMUM-CAMPHORA; LEAF-LITTER; NITROGEN MINERALIZATION; ELEVATED CO2; COMMUNITY; IMPACTS; FOREST; CARBON; TRANSFORMATION; RESPIRATION;
D O I
10.1007/s11104-022-05785-8
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Aims Nitrous oxide (N2O) plays an important role in global climate change. Plant expansion can alter soil nutrient cycling and greenhouse gas (GHG) fluxes but the effects of fine root litter mixing from plant expansion on litter decomposition, nutrient cycling, and GHG fluxes are poorly understood. Methods To evaluate the impacts of fine root litter mixing from plant expansion on GHG budgets, we conducted an in situ study over sixteen months in Japanese cedar (Cryptomeria japonica) plantations experiencing moso bamboo (Phyllostachys edulis) expansions. Litter decomposition and N2O production were quantified in a full-factorial complete-randomized design by comparing fine root litter of Japanese cedar, moso bamboo or their mixtures, with or without nitrogen (N) addition. Results We found that litter mixing accelerated decomposition, demonstrating a synergistic non-additive effect (19% increase in mass loss). This might have accelerated release of chemicals that inhibit microbial activities because litter mixtures had lower microbial biomass. Soil N2O emissions in the mixed litter treatment were 16.8% and 24.4% lower than those with only cedar or bamboo litter, respectively. N deposition promoted mass loss of mixed litter (28% increase in mass loss) and increased N2O emissions by 36.7%, 60.6% and 33.6% from cedar, mixed and bamboo litter treatments, respectively. Conclusion The expansion of moso bamboo promotes the return of soil nutrients, reduces N2O emissions, and potentially mitigates GHG emissions. However, with increasing N deposition in the future, moso bamboo expansion will likely contribute to global warming.
引用
收藏
页码:7 / 21
页数:15
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