Effects of irrigation and plowing on soil carbon dioxide efflux in a poplar plantation chronosequence in northwest China(Environment)

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概要

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• Soil respiration in forest plantations can be greatly affected by management practices. Irrigation is necessary for high productivity of poplar plantations in semi-arid northwest China. Moreover, plowing is essential for improving soil quality and reducing evaporation. In the present study, the influences of irrigation and plowing on soil carbon dioxide (CO_2) efflux were investigated in poplar plantations in 2007 and 2008. The experiments included three stand age classes receiving three treatments: control, irrigation, and plowing. Mean soil respiration in irrigation treatment stands was 5.47, 4.86, and 4.43 μmol m^<-2>s^<-1> in 3-, 8-, and 15-year-old stands, respectively, during the growing season. In contrast, mean soil respiration in control stands was 3.71, 3.83, and 3.98 μmol m^<-2>s^<-1> in 3-, 8-, and 15-year-old stands, respectively. During the entire observation period, mean soil respiration in plowing treatment stands increased by 36.2% compared with that in the control stands. Mean soil respiration in irrigation treatment stands was significantly higher than that in the control stands; this was mainly because fine root growth and decomposer activities were greatly depressed by soil drought, since natural precipitation could not meet their water demands. The results also suggest that plowing management can greatly increase soil CO_2 emission by modifying soil structure. After plowing, soil bulk density decreased and soil aeration was greatly improved, leading to greater rates of oxidation and mineralization.

• 一般社団法人日本土壌肥料学会の論文

著者

• Zhou Guangsheng

  State Key Laboratory Of Vegetation And Environmental Change Institute Of Botany Chinese Academy Of S

• Zhou Guangsheng

  State Key Laboratory Of Vegetation And Environmental Change Institute Of Botany The Chinese Academy

• Jiang Yuan

  State Key Laboratory Of Vegetation And Environmental Change Institute Of Botany The Chinese Academy

• YAN Meifang

  State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University

• ZHANG Xinshi

  State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University

• Yan Meifang

  State Key Laboratory Of Earth Surface Processes And Resource Ecology Beijing Normal University:state

• Zhang Xinshi

  State Key Laboratory Of Earth Surface Processes And Resource Ecology Beijing Normal University:state

関連論文

• 内蒙古中部の砂丘に生育する主要植物4種の気温と土壌水分に対する成長反応
• Vegetation responses along environmental gradients on the Ordos plateau, China
• Effects of irrigation and plowing on soil carbon dioxide efflux in a poplar plantation chronosequence in northwest China(Environment)

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