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SCI论文目录 |
Effects of Precipitation Increase on Soil Respiration: A Three-Year Field Experiment in Subtropical Forests in China |
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| 出 版 社：plos one |
| 发表时间：2012 |
| 台 站：
鼎湖山森林生态系统定位研究站
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| 作 者：邓琦，张德强，周国逸等 |
| 点 击 率：3442 |
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| 摘 要(英文)：Background: The aim of this study was to determine response patterns and mechanisms of soil respiration to precipitation increases in subtropical regions.
Methodology/Principal Findings: Field plots in three typical forests [i.e. pine forest (PF), broadleaf forest (BF), and pine and broadleaf mixed forest (MF)] in subtropical China were exposed under either Double Precipitation (DP) treatment or Ambient Precipitation (AP). Soil respiration, soil temperature, soil moisture, soil microbial biomass and fine root biomass were measured over three years. We tested whether precipitation treatments influenced the relationship of soil respiration rate (R) with soil temperature (T) and soil moisture (M) using R=(a+cM)exp(bT), where a is a parameter related to basal soil respiration; b and c are parameters related to the soil temperature and moisture sensitivities of soil respiration, respectively.We found that the DP treatment only slightly increased mean annual soil respiration in the PF (15.4%) and did not
significantly change soil respiration in the MF and the BF. In the BF, the increase in soil respiration was related to the enhancements of both soil fine root biomass and microbial biomass. The DP treatment did not change model parameters,but increased soil moisture, resulting in a slight increase in soil respiration. In the MF and the BF, the DP treatment decreased soil temperature sensitivity b but increased basal soil respiration a, resulting in no significant change in soil respiration.
Conclusion/Significance: Our results indicate that precipitation increasing in subtropical regions in China may have limited
effects on soil respiration. |
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 邓琦-2012-Plos one-Effects of Precipitation Increase on Soil Respiration A Three-Year Field Experiment in Subtropical Forests in China.pdf |
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