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| Vertical Distribution of Soil Organic Carbon and Soil Basal Respiration in Tea Soil and Adjacent Woodland Soil |
| Received:February 05, 2015 |
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| KeyWord:tea;soil organic carbon;WSOC;MBC;soil basal respiration;vertical distribution |
| Author Name | Affiliation | E-mail | | FAN Li-chao | Tea Research Institute, Chinese Academy of Agricultural Science, Hangzhou 310008, China | | | HAN Wen-yan | Tea Research Institute, Chinese Academy of Agricultural Science, Hangzhou 310008, China | hanwy@tricaas.com | | LI Xin | Tea Research Institute, Chinese Academy of Agricultural Science, Hangzhou 310008, China | | | LI Zhi-xin | Tea Research Institute, Chinese Academy of Agricultural Science, Hangzhou 310008, China | |
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| Abstract: |
| In this study, the vertical distributions of soil organic carbon(SOC), water soluble organic carbon(WSOC), microbial biomass carbon(MBC) and soil basal respiration(SBR) in tea soils and their adjacent woodland soils were determined to explore the relationship between soil basal respiration rate and SOC, WSOC and MBC. Results showed that SOC, WSOC, MBC and soil cumulative respiration flux were all greater in tea garden than in woodland, and decreased with increasing soil depth in both types of soils. Biological activity indicators(SWOC/SOC and qCO2) in the tea garden soils were also greater than those in the woodland soils. However, qMBC in the tea garden was less than that in the woodland. Soil respiration rate was significantly and positively correlated with SOC, WSOC and MBC. Multiple linear regression by "Backward Elimination" method showed that soil respiration rate was affected by SOC>MBC>WSOC in the tea garden soils, but by WSOC>SOC>MBC in the woodland soils. Soil metabolism was greater in the tea garden than in the woodland soils. The stability of soil carbon pools in the tea garden was less than that in the woodland, implying less accumulation of soil organic carbon in tea garden than in woodland. More attention to scientific and reasonable fertilization and tillage management is necessary to maintain soil sustainability of tea gardens. |
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