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| Effect of Returning Cropland to Forestland on N2O Emissions from Sloping Purple Soil |
| Received:February 05, 2015 |
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| KeyWord:purple soil;alder and cypress mixed forest land;sloping cropland;returning cropland to forestland;N2O |
| Author Name | Affiliation | E-mail | | KE Yun | Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China
Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China | | | YANG Hong-wei | Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China | | | WANG Xiao-guo | Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China | | | HU Ting-xu | Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LIU Yun | Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | ZHU Bo | Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China | bzhu@imde.ac.cn |
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| Abstract: |
| Cropland is a large source of global N2O emissions, while forestland emits much less N2O. Thus, returning cropland to forestland would help reduce global N2O emissions. Here static chamber-GC technique was used to compare soil N2O emission fluxes from sloping cropland(CL) and forestland returned from cropland for 15 and 30 years. Soil temperature, moisture, nitrate(NO3--N) and ammonia(NH4+-N) nitrogen content in the soils were also recorded for one year. Results showed that average fluxes of soil N2O from CL, CL-CK(CL-Check test), FL15 and FL30(15 and 30 years old forest) were 25.6, 6.60, 1.20, and 4.35 μg N2O-N·m-2·h-1, respectively, with significantly higher N2O emissions from CL than from CL-CK, FL15 and FL30(P < 0.01). The N2O emissions from FL30 were also significantly higher than that from FL15(P < 0.01). Annual cumulative N2O emissions from CL, CL-CK, FL15 and FL30 were respectively 1.01, 0.400, 0.050, and 0.310 kg N2O-N·hm-2. The potential of N2O mitigation by nitrogen fertilizer reduction was as high as 0.620 kg N2O-N·hm-2. Compared with CL-CK, FL15 and FL30 reduced N2O emissions by 0.350 and 0.090 kg N2O-N·hm-2, respectively, may due to increases in soil carbon to nitrogen ratios and changes in soil properties. |
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