Soil CO2 emissions from different slope gradients and positions in the semiarid Loess Plateau of China
作者： Zhiqi Wang , Rui Wang , Qiqi Sun , Lanlan Du , Man Zhao
DOI: 10.1016/J.ECOLENG.2017.04.050
关键词: Water content 、 Surface runoff 、 Moisture 、 Loess plateau 、 Biomass (ecology) 、 Environmental science 、 Soil science 、 Hydrology 、 Slope gradient 、 Sediment 、 Carbon cycle
摘要: Abstract Knowledge of CO2 emissions under different slope gradients and positions its controlling factors is critical in accurately estimating carbon cycling on the slopes eroded regions. In this study, three east-facing plots 100 m2 (20 m × 5 m) with a gradient 0.5° (S0.5), 1° (S1), 3° (S3) were established an gully semi-arid Loess Plateau, China. The emission, temperature, moisture, runoff, sediment, fine root biomass grain yield these measured from October 2013 to September 2015 investigate relationship between soil emissions. results showed that mean annual cumulative at S1 S3 (731.0 ± 65.1 628.3 ± 74.8 g C m−2 year−1) about 13.4% 25.5% lower than S0.5 (843.7 ± 84.9 g C m−2 year−1). higher bottom upper slope, increase 26.2% S3, 22.9% 14.5% S0.5, respectively. moisture ranged 40.8% 44.8% water-filled pore space (WFPS) among gradients, 35.8% 45.6% WFPS positions. There was significant difference (S0.5 > S1 > P
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