首页|Temporal changes in mixing effects on litter decay and nitrogen release in a boreal riparian forest in northeastern China
Temporal changes in mixing effects on litter decay and nitrogen release in a boreal riparian forest in northeastern China
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In riparian forests,litter decay provides essential energy and nutrients for both terrestrial and fluvial ecosys-tems.Litter mixing effects(LMEs)are crucial in regulating litter decay and nutrient dynamics,yet how LMEs change over time is unclear in riparian forests.In this study,leaf litter of three common species(Alnus sibirica Fisch.ex Turcz,Betula platyphylla Sukaczev,and Betula fruticosa Pall.)were mixed in an equal mass ratio and LMEs were measured for mass and nitrogen(N)remaining in whole lit-ter mixtures over a 3-year period in a boreal riparian forest,northeastern China.LMEs were also assessed for component litter mass and N remaining by separating litter mixtures by species.During the decay of litter mixtures,antagonistic effects on mass and N remaining were dominant after one and two years of decay,whereas only additive effects were observed after three years.LMEs correlated negatively with functional diversity after the first and two years of decay but disappeared after three years.When sorting litter mixtures by species,non-additive LMEs on mass and N remaining decreased over incubation time.Moreover,non-additive LMEs were more frequent for litter of both B.platyphylla and B.fruticosa with lower N concentration than for A.sibirica litter with higher N concentration.These results indicate that incubation time is a key determinant of litter mixing effects during decay and highlight that late-stage lit-ter mixture decay may be predicted from single litter decay dynamics in boreal riparian forests.
Simin Wang、Bo Liu、Rui Li、Xiaoxin Sun、Rong Mao、Yanbo Hu
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Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed,College of Forestry,Jiangxi Agricultural University,Nanchang 330045,People's Republic of China
Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,People's Republic of China
Key Laboratory of Sustainable Forest Ecosystem Management of Ministry of Education,School of Forestry,Northeast Forestry University,Harbin 150040,People's Republic of China
Heilongjiang Sanjiang Plain Wetland Ecosystem Research Station,Fuyuan 156500,People's Republic of China
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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangxi,ChinaDouble Thousand Plan of Jiangxi Province
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