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

• 作者: Chen Aihua Dong Yanli Ma Tao Zhang Feng Zhou Bo
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: Soil respiration rate DIURNAL variation CHARACTERISTICS TERRACE Slope farmland Loess HILLY and GULLY regions China
• 年，卷（期）: 2017,（1）
• 页码范围: 67-70
• 页数: 4页
• 分类号: P

摘要

Soil C 02 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 -1 5 ：00, while the soil respiration rate of slope farmland reached the peak from 11 ：00 to 13 ：00, and it was the lowest at next 07 ：00. The daily average of soil respiration rate in slope farmland was 0.86 nmol/( m2s ) , 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.