Characteristics of Soil Respiration of Terraces and Slope Farmland in Loess Hilly and Gully Regions

• 作 者: Ma Tao Zhou Bo Chen Aihua Zhang Feng Dong Yanli
• 机 构: Gansu Institute of Soil and Water Conservation,Institute of Desertification Studies,Chinese Academy
• 出 处: Meteorological and Environmental Research
• 发表日期: 2017年01期
• 关键词: farmland respiration hilly loess accounting emissions diurnal positions Plateau

Soil CO_2 emissions of terraces and slope farmland in loess hilly and gully regions were measured by using Infra Red Gas Analysis(IRGA),and the diurnal variation characteristics of soil respiration rate in different slope positions of terraces and slope farmland were analyzed.The results show that the diurnal variation curves of soil respiration rate of terraces and slope farmland in loess hilly and gully regions had a single peak.The soil respiration rate of terraces reached the peak during 13:00-15:00,while the soil respiration rate of slope farmland reached the peak from 11:00 to13:00,and it was the lowest at next 07:00.The daily average of soil respiration rate in slope farmland was 0.86μmol/(m~2·s),accounting for 93.48% of that of terraces.The daily average of soil respiration rate in different slope positions of terraces and slope farmland is shown as follows:the bottom of the slope>the middle of the slope>the top of the slope.At the top of the slope,the daily averages of soil respiration rate in terraces and slope farmland were the same;at the middle and bottom of the slope,the daily average of soil respiration rate in terraces was larger than that of slope farmland.

Soil CO2 emissions of terraces and slope farmland in loess hilly and gully regions were used by Infra Red Gas Analysis (IRGA), and the diurnal variation characteristics of soil respiration rate in different slope positions of terraces and slope farmland were. The results show that the diurnal variation curves of soil respiration rate of terraces and slope farmland in loess hilly and gully regions had a single peak. soil respiration rate of terraces reached the peak during 13: 00-15: 00, while the soil respiration rate of slope farmland reached the peak from 11:00 to13: 00, and it was the lowest at next 07: 00. The daily average of soil respiration rate in slope farmland was 0.86μmol / (m ~ 2 · s), accounting for 93.48% of that of terraces.The daily average of soil respiration rate in different slope positions of terraces and slope farmland is shown as follows: the bottom of the slope> the middle of the slope> the top of the slope. At the top of the slope, the daily averages of soil respiration rate in terraces and slope farmland were the same; at the middle and bottom of the slope, the daily average of soil respiration rate in terraces was larger than that of slope farmland.