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Stand Age and Productivity Control Soil Carbon Dioxide Efflux and Organic Carbon Dynamics in Poplar Plantations
Author(s) -
Sun Shou-Qin,
Bhatti Jagtar S.,
Jassal Rachhpal S.,
Chang Scott X.,
Arevalo Carmela,
Black T. Andrew,
Sidders Derek
Publication year - 2015
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2015.06.0233
Subject(s) - cycling , soil water , productivity , soil carbon , environmental science , carbon cycle , soil respiration , soil fertility , agronomy , forestry , ecology , soil science , ecosystem , biology , geography , economics , macroeconomics
Establishment of hybrid poplar (HP) plantations has been advocated as an effective method for sequestering CO 2 from the atmosphere. However, how carbon (C) cycling in HP plantations changes during stand development under different soil fertility and climatic conditions is poorly understood. We studied the dynamics of soil respiration ( R s ) and its heterotrophic ( R h ) and autotrophic ( R a ) components and soil organic C (SOC) content in HP plantations of different stand ages established on soils with different productivity (Class 1 vs. Class 3 soils) in Alberta (AB) and Ontario (ON), Canada. The R s was the highest for AB‐Class 1 (high‐productivity) soils, followed by AB‐Class 3 and ON‐Class 3 (low‐productivity) soils. Annual R s , R h , and R h / R s decreased in the first 3 yr in AB‐Class 1 and 6 yr in AB‐Class 3 soils after plantation establishment and increased thereafter, but they increased with stand age after plantation establishment in ON‐Class 3 soils. The SOC content in the AB‐Class 1, AB‐Class 3, and ON‐Class 3 sites decreased in the first 3, 5, and 1.5 yr, respectively, after plantation establishment and then increased, reaching the pre‐establishment level after 6, 10, and 3 yr, respectively. From this first attempt to understand C cycling across multiple sites with different soil fertility levels, we conclude that stand age and soil productivity play a significant role in affecting C cycling, and such effects should be considered in regional and global C cycling models, especially when assessing the C sequestration potential of HP plantations.