Effect of nitrogen addition and litter removal on understory vegetation, soil mesofauna, and litter decomposition in loblolly pine plantations in subtropical Argentina

被引:34
作者
Trentini, C. P. [1 ]
Villagra, M. [1 ]
Gomez Pamies, D. [1 ]
Bernava Laborde, V [2 ]
Bedano, J. C. [3 ,4 ]
Campanello, P., I [1 ,5 ]
机构
[1] Univ Nacl Misiones, CONICET, Inst Biol Subtrop, Lab Ecofisiol & Ecol Forestal, Bertoni 85, RA-3370 Puerto Iguazu, Misiones, Argentina
[2] Direcc Reg Noreste Adm Parques Nacl, Tres Fronteras 183, RA-3370 Puerto Iguazu, Misiones, Argentina
[3] Univ Nacl Rio Cuarto, CONICET, FCEFQyN, Dept Geol, Ruta 36,Km 601,X5804 BYA, Cordoba, Argentina
[4] Univ Nacl Rio Cuarto, CONICET, FCEFQyN, Dept Ciencias Nat, Ruta 36,Km 601,X5804 BYA, Cordoba, Argentina
[5] Univ Nacl Patagonia San Juan Bosco, Fac Ingn, Ctr Estudios Ambientales Integrados, CONICET, RA-9200 Esquel, Chubut, Argentina
关键词
Atlantic forest; Ecological function; Plant growth form; Native tree regeneration; Collembola; TREE SEEDLING GROWTH; LEAF-LITTER; MICROBIAL BIOMASS; PLANT DIVERSITY; NORWAY SPRUCE; PHOSPHORUS LIMITATION; NUTRIENT LIMITATIONS; WATER AVAILABILITY; TROPICAL FOREST; SILVER BIRCH;
D O I
10.1016/j.foreco.2018.07.012
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Loblolly pine monocultures have been increasingly expanding in the Atlantic Forest of South America especially in northern Argentina. Pine plantations can modify understory vegetation and soil characteristics due to the management practices and to the dense mulch of pine needles that develop in the forest floor that could affect soil biota and ecosystem processes. Nitrogen (N) addition as expected as atmospheric deposition can also contribute to these changes. The aim of this study was to assess the effect of litter removal and low levels of N addition on understory regeneration, soil mesofauna abundance, and leaf litter decomposition. For this purpose, a completely randomized block design was used. Nitrogen addition had significant effects on understory regeneration promoting creeping herbs, graminoids and shrubs life forms affecting tree establishment and growth. Litter removal treatment showed the same pattern but only promoting the creeping herbs that could also have affected tree species. Decomposition decreased due to litter removal and was slightly increased by N addition. The addition of N decreased the abundance of mesofauna in the mulch, especially Symphypleone (a suborder of Collembola), but the abundance of the soil communities was not affected. Litter removal had a strong impact on these communities because most individuals and species of the mesofauna are present in the litter and not in the soil. This is one of the first studies analyzing the effect of low amounts of N addition and litter removal in subtropical pine plantations and contribute to understand potential impacts of increasing N deposition on biodiversity and soil processes, and to select organisms that may help as bioindicators in assessing impacts on ecological functions in productive ecosystems.
引用
收藏
页码:133 / 142
页数:10
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