Impact of the conversion of Brazilian woodland savanna (cerradao) to pasture and Eucalyptus plantations on soil nitrogen mineralization

被引：18
作者：
Lopez-Poma, Rosario [1 ,2 ]
Pivello, Vania R. [3 ]
de Brito, Gisele S. [3 ]
Bautista, Susana [1 ,2 ]
机构：
[1] Univ Alicante, Dept Ecol, Alicante, Spain
[2] Univ Alicante, IMEM, Alicante, Spain
[3] Univ Sao Paulo, Inst Biosci, Dept Ecol, Sao Paulo, SP, Brazil
来源：
SCIENCE OF THE TOTAL ENVIRONMENT | 2020年 / 704卷
关键词：
Cerrado; Eucalyptus plantation; Land use change; Nitrogen cycling; Soil enzyme activity; Urochloa pasture; LAND-USE CHANGE; COMMUNITY STRUCTURE; MICROBIAL BIOMASS; COLORIMETRIC DETERMINATION; ENZYME-ACTIVITIES; TROPICAL FORESTS; UREASE ACTIVITY; ORGANIC-MATTER; CARBON; FIRE;
D O I：
10.1016/j.scitotenv.2019.135397
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The Brazilian savanna (Cerrado) has been extensively converted to croplands, pastures and forestry plantations, and the deforestation frontier continues expanding. Land conversion may cause critical changes in soil functioning, yet very little is still known about the impact of Cerrado conversion on nutrient cycling and soil fertility. Here, we addressed this knowledge gap by investigating the effects of the woodland cerrado (cerradao) conversion into pastures and Eucalyptus plantations on nitrogen availability and mineralization potential, considering a wide range of spatial and temporal variability due to soil depth, site conditions, and seasonal variation. For three sites in Sao Paulo state and each of the target land cover types, we assessed the total N and inorganic N (NH4-N and NO3-N) pools, potentially mineralizable nitrogen (PMN) and soil urease activity in the first 2 m of the soil profile. Cerrado conversion to either pastures or Eucalyptus plantations significantly reduced NH4-N, while NO3-N showed similar values in Cerrado and Eucalyptus and lower values in pastures. We found a consistent pattern of lower N mineralization in the uppermost soil layers associated to Cerrado conversion, with decreases in PMN rate and urease activity. The soil below 30 cm depth showed no relevant changes. Considering the first 30 cm of the soil profile, the reduction in the stocks of inorganic N (NH4-N + NO3-N) ranged from similar to 14% for the conversion to Eucalyptus to similar to 20% for the conversion to pasture. The impact of land conversion on N cycling surpassed the influence of the spatial (between-site) and seasonal variation. Overall, the results indicate a decline in available N and overall soil fertility due to Cerrado conversion, which could further increase N limitation in the Cerrado region, increase fertilization needs for future exploitation, and compromise the recovery of Cerrado in case of land abandonment or restoration. (C) 2019 Elsevier B.V. All rights reserved.
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页数：12
相关论文
共 88 条
[41]  
Hunke P., 2015, Geoderma Reg, V4, P31, DOI [10.1016/j.geodrs.2014.12, DOI 10.1016/J.GEODRS.2014.12.001, 10.1016/j.geodrs.2014.12.001]
[42]  
KANDELER E, 1988, BIOL FERT SOILS, V6, P68, DOI 10.1007/BF00257924
[43]  
Kizilkaya R, 2010, ZEMDIRBYSTE, V97, P15
[44]  
Klink C.A., 2002, CERRADOS BRAZIL, P69
[45]   Conservation of the Brazilian Cerrado [J].
Klink, CA ;
Machado, RB .
CONSERVATION BIOLOGY, 2005, 19 (03) :707-713
[46]   Mechanisms of plant species impacts on ecosystem nitrogen cycling [J].
Knops, JMH ;
Bradley, KL ;
Wedin, DA .
ECOLOGY LETTERS, 2002, 5 (03) :454-466
[47]   Conversion of tropical forests to smallholder rubber and oil palm plantations impacts nutrient leaching losses and nutrient retention efficiency in highly weathered soils [J].
Kurniawan, Syahrul ;
Corre, Marife D. ;
Matson, Amanda L. ;
Schulte-Bisping, Hubert ;
Utami, Rahayu ;
van Straaten, Oliver ;
Veldkamp, Edzo .
BIOGEOSCIENCES, 2018, 15 (16) :5131-5154
[48]   Biogeochemical cycles of nutrients in tropical Eucalyptus plantations Main features shown by intensive monitoring in Congo and Brazil [J].
Laclau, Jean-Paul ;
Ranger, Jacques ;
de Moraes Goncalves, Jose Leonardo ;
Maquere, Valerie ;
Krusche, Alex V. ;
M'Bou, Armel Thongo ;
Nouvellon, Yann ;
Saint-Andre, Laurent ;
Bouillet, Jean-Pierre ;
Piccolo, Marisa de Cassia ;
Deleporte, Philippe .
FOREST ECOLOGY AND MANAGEMENT, 2010, 259 (09) :1771-1785
[49]   Effects of plant species richness and evenness on soil microbial community diversity and function [J].
Lamb, Eric G. ;
Kennedy, Nabla ;
Siciliano, Steven D. .
PLANT AND SOIL, 2011, 338 (1-2) :483-495
[50]   Estimating the world's potentially available cropland using a bottom-up approach [J].
Lambin, E. F. ;
Gibbs, H. K. ;
Ferreira, L. ;
Grau, R. ;
Mayaux, P. ;
Meyfroidt, P. ;
Morton, D. C. ;
Rudel, T. K. ;
Gasparri, I. ;
Munger, J. .
GLOBAL ENVIRONMENTAL CHANGE-HUMAN AND POLICY DIMENSIONS, 2013, 23 (05) :892-901
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