Journal of Food, Agriculture and Environment

The influence of groundwater on soil respiration rate of Populus euphratica community at lower reaches of Tarim River, Xinjiang, China 

Author(s):

Xiang Huang  *, Jian Xin Ma

Recieved Date: 2012-06-22, Accepted Date: 2012-10-08

Abstract:

The relationship between soil respiration rate and soil moisture is complex. A number of studies have suggested that relationship between soil respiration and soil water, and less researched on the influence of groundwater on soil respiration. An in-depth study of the relation between groundwater table and soil respiration rate could lead to better interpretation and understanding of the ecological system of soil respiration and water relations. This study mainly focused on the change characteristics of soil respiration rate of Populus communities under different groundwater tables and soil moisture, revealing the soil under drought stress in P. euphratica community the relationship between respiratory rate and water factors, which provide a scientific basis for in-depth study of Populus euphratica soil carbon stock changes in characteristics. Throughout monitoring real time, the shallow groundwater, and soil moisture, the spatiotemporal variation in soil respiration rate and its influencing factors under different groundwater table gradient at the P. euphratica community were studied at the lower reaches of Tarim River in Xinjiang, China. The results indicated that within a specific limit ofgroundwater table ranging from -1.5 m to -4.64 m, the soil respiration rate of the P. euphratica community increased with the corresponding decrease in the groundwater table. The changes of groundwater table accounted for about 76% of the monthly change of the soil respiration rate within this limit, but when the groundwater table was ranging from -5.32 m to -9.07 m, the impact of the groundwater table on soil respiration rate was very weak. In the extremely arid environment, groundwater has some influence on soil respiration, but with the groundwater level to increase its influence on soil respiration gradually reduced until it disappears.

Keywords:

Groundwater table, soil moisture, diurnal variation, monthly variation, the lower reaches of Tarim River

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1468-1472

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