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Effects of nitrogen and phosphorus additions on soil methane uptake in disturbed forests
Author(s) -
Zheng Mianhai,
Zhang Tao,
Liu Lei,
Zhang Wei,
Lu Xiankai,
Mo Jiangming
Publication year - 2016
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
eISSN - 2169-8961
pISSN - 2169-8953
DOI - 10.1002/2016jg003476
Subject(s) - phosphorus , nitrogen , secondary forest , forest floor , environmental science , zoology , methane , deposition (geology) , agronomy , disturbance (geology) , nutrient , chemistry , ecology , environmental chemistry , soil water , agroforestry , biology , soil science , organic chemistry , paleontology , sediment
Atmospheric nitrogen (N) deposition is generally thought to suppress soil methane (CH 4 ) uptake in natural forests, and phosphorus (P) input may alleviate this negative effect. However, it remains unclear how N and P inputs control soil CH 4 uptake in disturbed forests. In this study, soil CH 4 uptake rates were measured in two disturbed forests, including a secondary forest (with previous, but not recent, disturbance) and a plantation forest (with recent continuous disturbance), in southern China for 34 months of N and/or P additions: control, N addition (150 kg N ha −1 yr −1 ), P addition (150 kg P ha −1 yr −1 ), and NP addition (150 kg N ha −1 yr −1 plus 150 kg P ha −1 yr −1 ). Mean CH 4 uptake rate in control plots was significantly higher in the secondary forest (24.40 ± 0.81 µg CH 4 ‐C m −2 h −1 ) than in the plantation forest (17.07 ± 0.70 µg CH 4 ‐C m −2 h −1 ). CH 4 uptake rate had negative relationships with soil water‐filled pore space in both forests. In the secondary forest, N, P, and NP additions significantly decreased CH 4 uptake by 39.7%, 27.8%, and 37.6%, respectively, but had no significant effects in the plantation forest, indicating that P input does not alleviate the suppression of CH 4 uptake by N deposition. Taken together, our findings suggest that reducing anthropogenic disturbance, including harvesting of forest floor, and anthropogenic N and P inputs will increase soil CH 4 uptake in disturbed forests, which is important in view of the increased trends in global warming during recent decades.