干旱区研究

Arid Zone Research ›› 2015, Vol. 32 ›› Issue (5): 903-909.doi: 10.13866/j.azr.2015.05.11

• Soil and Soil Conservation • Previous Articles     Next Articles

Experimental Study on Carbon Leaching during Irrigation in Arid Areas

XIE Huai-liang1,2,3, WANG Yu-gang1,2, LI Yan1,2   

  1. 1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China;
    2. Fukang Station of Desert Ecology, Chinese Academy of Sciences, Fukang 831505, Xinjiang, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-12-16 Revised:2015-01-26 Online:2015-09-15 Published:2015-10-14

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Abstract: The transfer of carbon in the hydrologic cycle is one of the hot-point issues to address climate change,and an important component of global carbon budgets,understanding the significance of soil carbon processes can enhance development of strategies to mitigate atmospheric carbon concentrations. In order to quantify the contribution of field irrigation to dissolved carbon transfer in arid areas,a leaching experiment on soil column to simulate irrigation was carried out. This study measured organic and inorganic carbon leaching loses from different soil (gray desert soil and oasis farmland soil) with different crops (spring wheat and rice) to explore the organic and inorganic carbon transport mechanism under different irrigation manners. Each soil type had 10 experiments with spring wheat and rice,respectively. Moreover,there were 3 soil columns without any crops. In the first period,the amount of organic and inorganic carbon was highest. As the change of seasons and the growth of crops,the water consumption increasing gradually reduced the amount of organic and inorganic carbon leaching; in the salt desert,organic carbon leaching account for percent 54 to 63.1 of the total carbon leaching,higher than inorganic carbon. However in the farmland,inorganic carbon leaching accounted for percent 68.6 to 83.7 of the total carbon leaching,much larger than organic carbon; Rice cultivation has higher amount of irrigation,so organic and inorganic carbon leaching is higher than spring wheat; Spring wheat cultivation patterns,organic and inorganic carbon leaching from the soil of salt desert were higher than farmland soil; Rice cultivation patterns,organic carbon leaching from salt desert was also higher than farmland soil,but the amount of inorganic carbon leaching was higher in farmland soil than salt desert soil; Organic and inorganic carbon leaching of cultivation spring wheat soil was higher than contrast (P<0.05),however,growing rice have no significant difference with contrast (P>0.05). The results showed that soil type,crop type and amount of irrigation has a significant effect on soil organic carbon and inorganic carbon leaching.

Key words: gray soil, organic carbon, inorganic carbon, irrigation, carbon leaching, arid areas