Dynamics of water and ion transport driven by corn canopy in the Yellow River basin

文献类型： 外文期刊

第一作者： Kitano, Masaharu

作者： Kitano, Masaharu;Yasutake, Daisuke;Kobayashi, Tetsuo;Hidaka, Kota;Wajima, Takahiro;Wang, Weizhen;He, Wenjun

作者机构：

关键词： active and selective uptake;transpiration stream;water and ion transport

期刊名称：BIOLOGIA （ 影响因子：1.35； 五年影响因子：1.139 ）

ISSN： 0006-3088

年卷期： 2006 年 61 卷

页码：

收录情况： SCI

摘要： Water and ion balance in a corn field in the semi-arid region of the upper Yellow River basin (Inner Mongolia, China) was analyzed with special reference to transpiration stream and selective nutrient uptake driven by the crop canopy. During the crop development stage (June 7 to July 17, 2005), crop transpiration and soil evaporation were evaluated seperately on a daily basis, and concentrations of NO3-, PO43-, K+, Na+, Ca2+ and Cl- ions in the Yellow River water, irrigation water, ground water, soil of the root zone and xylem sap of the crop were analyzed. The crop transpiration accounted for 83.4% of the evapotranspiration during the crop development stage. All ions except for Na+ were highly concentrated in the xylem sap due to the active and selective uptake of nutrients by roots. In particular, extremely high concentrations of the major essential nutrients were found in the nighttime stem exudate, while these concentrations in the river water, the irrigation water, the ground water and the root-zone soil were lower. On the other hand, Na+, which is not the essential element for crop growth, was scarcely absorbed by roots and was not highly concentrated in the xylem sap. Consequently, Na+ remained in the ground water and the root-zone soil at higher concentrations. These results indicate that during the growing season, crop transpiration but not soil evaporation induces the most significant driving force for mass flow (capillary rise) transporting the ground water toward the rhizosphere, where the dynamics of ion balance largely depends on the active and selective nutrient uptake by roots.

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