Optimization of yield and water-use of different cropping systems for sustainable groundwater use in North China Plain

文献类型： 外文期刊

第一作者： Sun, Qinping

作者： Sun, Qinping;Cui, Zhenling;Zhang, Fusuo;Chen, Xinping;Sun, Qinping;Kroebel, Roland;Mueller, Torsten;Roemheld, Volker

作者机构：

关键词： Groundwater balance;Double cropping systems;Irrigation water utilization efficiency;North China Plain

期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：4.516； 五年影响因子：5.12 ）

ISSN：

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收录情况： SCI

摘要： a- Field experiments with four cropping systems were conducted for sustainable groundwater using. a- The wheat/maize rotation over used groundwater under optimized irrigation condition. a- The new cropping systems improved the WUE, but with the yields decreasing. a- The high yielding maize was expected to be dominant system in a long term. A groundwater crisis is going on in the North China Plain (NCP), due to the excessive water consumption of the traditional winter wheat (WW)/summer maize (SM) double cropping system (two harvests in one year). In order to improve the water use efficiency in this particular cropping system and to evaluate the sustainability of water usage in Chinese agroecosystems, two field experiments were conducted from October 2004 to September 2006 at two sites of the North China Plain. The field experiments included four treatments: (1) farmers' practice (FP) with two harvests in one year (WW/SM rotation), (2) FP with reduced input (RI) of water and nitrogen (WW/SM rotation), (3) three harvests in two years (TW, 1st year: WW/SM; 2nd year: spring maize), and (4) continuous spring-maize monoculture (CS) with one harvest per year (spring maize). In the treatments RI, TW and CS, the amount and timing of irrigation and nitrogen fertilization was optimized using TDR based soil moisture measurements and the Nmin-method, respectively. Data showed that the utilization efficiency of irrigation water can be improved by optimizing soil water management compared to the traditional water management (FP). However, the groundwater net consumption required for RI still surpassed 300mmyra degree 1. Both FP and RI, still overused groundwater resources. The groundwater consumption in the continuous spring maize (CS) was on average 139mmyra degree 1. Therefore, the CS system can show the potential to use groundwater sustainably in the long term. Water usage of the TW treatment was in between the water usage of the other treatments. The grain yields in the double cropping systems (FP and RI) were higher than that in the two other systems (TW and CS). But the CS treatment showed the higher W UE than others.

分类号： S2

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