On the diel characteristics of soil respiration in winter wheat croplands in the North China Plain
Quan ZHANG1,Dawen YANG1(),Huimin LEI1,Hongbo BO2,Jianfeng CAI2
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China 2. Management Office of the Weishan Irrigation District, Liaocheng 252000, China
Soil respiration in a typical wheat cropland was measured from April to June, 2011 to understand the diel variations of the total soil respiration, heterotrophic respiration, autotrophic respiration, and their corresponding controlling factors in wheat croplands in the North China Plain. The root exclusion method was used to measure total soil respiration, heterotrophic respiration and autotrophic respiration. The results showed that the total soil respiration and the heterotrophic respiration both had single peaks at around 14:00, while the autotrophic respiration did not have apparent diel characteristics. The ratio of autotrophic respiration to the total soil respiration varied little throughout the day but varied some during different growth stages. The heterotrophic respiration was more closely related to the air temperature than to the soil temperature. In addition, the heterotrophic respiration was negatively correlated to the relative humidity. The autotrophic respiration was dependent on the gross primary production with a time lag. In summary, the diel variations of soil respiration in a field were mainly dependent on the air temperature, relative humidity and photosynthesis rate.
张权,杨大文,雷慧闽,薄宏波,蔡建峰. 华北平原典型冬小麦农田土壤呼吸日内变化规律[J]. 清华大学学报（自然科学版）, 2015, 55(1): 33-38.
Quan ZHANG,Dawen YANG,Huimin LEI,Hongbo BO,Jianfeng CAI. On the diel characteristics of soil respiration in winter wheat croplands in the North China Plain. Journal of Tsinghua University(Science and Technology), 2015, 55(1): 33-38.
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2015, Vol. 55 
),雷慧闽1,薄宏波2,蔡建峰2
