[Objective] The aim was to quantitatively predict the variation trend of maize yield in Yellow River irrigation area of Ningxia under future climate change scenarios.[Method] Based on the data of daily temperature,pre...[Objective] The aim was to quantitatively predict the variation trend of maize yield in Yellow River irrigation area of Ningxia under future climate change scenarios.[Method] Based on the data of daily temperature,precipitation and radiation in 25 km × 25 km grid in Ningxia from 2010 to 2100 obtained by regional climate model,maize yield in Yellow River irrigation area of Ningxia in the 21st century was studied by means of corrected CERES-Maize model.[Result] With climate warming,maize yield in Yellow River irrigation area of Ningxia in 2020s and 2050s showed increase trend compared with base years（average in 1961-1990）when current adaptive maize variety and optimum production management measures were adopted,while maize yield went down in 2080s with the further increase of temperature.The grain number per spike and spike grain weight as the yield components of maize also showed the same trend with maize yield.In 2020s and 2050s,the increase of maize yield under B2 scenario was higher than that under A2 scenario,while the decrease of maize yield under B2 scenario was lower than that under A2 scenario in 2080s.[Conclusion] With the increase of temperature,maize yield in Yellow River irrigation area of Ningxia went up firstly and then went down.展开更多
The paper describes the water resources in the irrigated area of Ningxia, China, andthe methods for improving the utilization of the water resources, and puts forward somesuggestions so as to utilize the water resourc...The paper describes the water resources in the irrigated area of Ningxia, China, andthe methods for improving the utilization of the water resources, and puts forward somesuggestions so as to utilize the water resources rationally. The history of irrigation farming in Ningxia can be traced back to more than two thou-展开更多
Muddy water irrigation has been widely practiced in the Yellow River Basin for agricultural production and is an important method of economical and intensive utilization of water resources.In this study,the effects of...Muddy water irrigation has been widely practiced in the Yellow River Basin for agricultural production and is an important method of economical and intensive utilization of water resources.In this study,the effects of sediment gradation,sand content,and soil moisture content on nitrogen(N)transformation were studied through a series of experimental tests.The results indicated that muddy water irrigation significantly affected agricultural soil physical and biological properties as well as N transformation.Soil bulk density,total porosity,pH,and microbial enzyme activities significantly correlated with N transformation as affected by the interaction between sediment and soil moisture.Sediment addition generally increased the soil bulk density and reduced the soil porosity and pH significantly,and the optimum moisture for promotion of the N transformation rate was 80%of the water-filled pore space.Therefore,muddy water irrigation has a potentially long-term influence on agricultural N cycles in semi-arid regions of northwestern China.This could provide a theoretical basis for scientific and rational use of muddy water for irrigation.展开更多
There are very serious water and sediment problems in the irrigated areas of northwest Shandong Province. In upper reaches of the irrigated area, the Yellow River water are widely used for farmland watering while leav...There are very serious water and sediment problems in the irrigated areas of northwest Shandong Province. In upper reaches of the irrigated area, the Yellow River water are widely used for farmland watering while leaving the ground water unusedion. But in the lower reaches, there is not enough surface water to be channeled for irrigation, so the ground water has always been over extracted, in some parts of the lower reaches, the descending water table caused the formation of funnel. Siltation in canals are very difficult to be cleared up, the drop of agriculture yield in the sandy land close to the channel head and along the main channels impair the living conditions of the local people. The conflicts between the excessive dependence on the Yellow River and the decreasing tendancy of water amount provided by the Yellow Ricer forces the local government to find new ways to solve the water resource problems. The answer could be: Using new technique for the irrigated system, pay more attention to the ground water development, and the construction and maintenance of wells.展开更多
为进一步提高黄河南岸灌区水氮利用效率,实现农田水肥深度节约的目标,于2023年在鄂尔多斯市杭锦旗吉日嘎朗图镇开展了滴灌条件水氮调控试验,研究了滴灌条件下不同水氮处理对玉米产量及水氮利用效率的影响并进行了水氮用量优化。结果表明...为进一步提高黄河南岸灌区水氮利用效率,实现农田水肥深度节约的目标,于2023年在鄂尔多斯市杭锦旗吉日嘎朗图镇开展了滴灌条件水氮调控试验,研究了滴灌条件下不同水氮处理对玉米产量及水氮利用效率的影响并进行了水氮用量优化。结果表明:同一灌水条件下,中氮处理玉米产量较低氮处理增加23.3%、水分利用效率增加7.14%、氮肥偏生产力降低18.3%,较高氮处理玉米产量增加2.8%、水分利用效率增加7.7%、氮肥偏生产力增加38.1%。同一施肥条件下,中水处理玉米产量较低水处理增加37.1%、水分利用效率增加26.1%、氮肥偏生产力增加16.6%,较高水处理玉米产量增加12.8%、水分利用效率增加38.3%、氮肥偏生产力增加12.9%。建立灌水量、施氮量与玉米产量、水分利用效率、氮肥偏生产力之间的三组回归模型,通过寻优得到三组水氮区间并取交集,获得同时满足高产、高水氮利用效率的全生育期水氮总用量优化区间为1800~2046 m ^(3)·hm^(-2)与210~249.2 kg·hm^(-2)。引用以Jensen模型为基础的水氮生产函数对生育期水氮总用量优化区间进行了各生育期分配,合理分配了滴灌条件下各生育期水氮制度。研究成果可为沿黄南岸灌区玉米种植水肥管理模式和方案提供参考。展开更多
基金Supported by Project of Ministry of Science and Technology of China"Response of Ningxia Climate to Global Climate Change and Its Mechanism"(2004DIB3J121)Climate Change Project of China Meteorological Administration(CCSF2007-27)Climate Change Bilateral Cooperation Project of China and Britain(2001-BA611B-04-06-01)~~
文摘[Objective] The aim was to quantitatively predict the variation trend of maize yield in Yellow River irrigation area of Ningxia under future climate change scenarios.[Method] Based on the data of daily temperature,precipitation and radiation in 25 km × 25 km grid in Ningxia from 2010 to 2100 obtained by regional climate model,maize yield in Yellow River irrigation area of Ningxia in the 21st century was studied by means of corrected CERES-Maize model.[Result] With climate warming,maize yield in Yellow River irrigation area of Ningxia in 2020s and 2050s showed increase trend compared with base years（average in 1961-1990）when current adaptive maize variety and optimum production management measures were adopted,while maize yield went down in 2080s with the further increase of temperature.The grain number per spike and spike grain weight as the yield components of maize also showed the same trend with maize yield.In 2020s and 2050s,the increase of maize yield under B2 scenario was higher than that under A2 scenario,while the decrease of maize yield under B2 scenario was lower than that under A2 scenario in 2080s.[Conclusion] With the increase of temperature,maize yield in Yellow River irrigation area of Ningxia went up firstly and then went down.
文摘The paper describes the water resources in the irrigated area of Ningxia, China, andthe methods for improving the utilization of the water resources, and puts forward somesuggestions so as to utilize the water resources rationally. The history of irrigation farming in Ningxia can be traced back to more than two thou-
基金supported by the Open Fund of the Key Laboratory of Lower Yellow River Channel and Estuary Regulation of Ministry of Water Resources of China(Grant No.HHNS202001)the Fundamental Research Funds for the Central Universities(Grants No.B200204033 and B210202117).
文摘Muddy water irrigation has been widely practiced in the Yellow River Basin for agricultural production and is an important method of economical and intensive utilization of water resources.In this study,the effects of sediment gradation,sand content,and soil moisture content on nitrogen(N)transformation were studied through a series of experimental tests.The results indicated that muddy water irrigation significantly affected agricultural soil physical and biological properties as well as N transformation.Soil bulk density,total porosity,pH,and microbial enzyme activities significantly correlated with N transformation as affected by the interaction between sediment and soil moisture.Sediment addition generally increased the soil bulk density and reduced the soil porosity and pH significantly,and the optimum moisture for promotion of the N transformation rate was 80%of the water-filled pore space.Therefore,muddy water irrigation has a potentially long-term influence on agricultural N cycles in semi-arid regions of northwestern China.This could provide a theoretical basis for scientific and rational use of muddy water for irrigation.
文摘There are very serious water and sediment problems in the irrigated areas of northwest Shandong Province. In upper reaches of the irrigated area, the Yellow River water are widely used for farmland watering while leaving the ground water unusedion. But in the lower reaches, there is not enough surface water to be channeled for irrigation, so the ground water has always been over extracted, in some parts of the lower reaches, the descending water table caused the formation of funnel. Siltation in canals are very difficult to be cleared up, the drop of agriculture yield in the sandy land close to the channel head and along the main channels impair the living conditions of the local people. The conflicts between the excessive dependence on the Yellow River and the decreasing tendancy of water amount provided by the Yellow Ricer forces the local government to find new ways to solve the water resource problems. The answer could be: Using new technique for the irrigated system, pay more attention to the ground water development, and the construction and maintenance of wells.
文摘为进一步提高黄河南岸灌区水氮利用效率,实现农田水肥深度节约的目标,于2023年在鄂尔多斯市杭锦旗吉日嘎朗图镇开展了滴灌条件水氮调控试验,研究了滴灌条件下不同水氮处理对玉米产量及水氮利用效率的影响并进行了水氮用量优化。结果表明:同一灌水条件下,中氮处理玉米产量较低氮处理增加23.3%、水分利用效率增加7.14%、氮肥偏生产力降低18.3%,较高氮处理玉米产量增加2.8%、水分利用效率增加7.7%、氮肥偏生产力增加38.1%。同一施肥条件下,中水处理玉米产量较低水处理增加37.1%、水分利用效率增加26.1%、氮肥偏生产力增加16.6%,较高水处理玉米产量增加12.8%、水分利用效率增加38.3%、氮肥偏生产力增加12.9%。建立灌水量、施氮量与玉米产量、水分利用效率、氮肥偏生产力之间的三组回归模型,通过寻优得到三组水氮区间并取交集,获得同时满足高产、高水氮利用效率的全生育期水氮总用量优化区间为1800~2046 m ^(3)·hm^(-2)与210~249.2 kg·hm^(-2)。引用以Jensen模型为基础的水氮生产函数对生育期水氮总用量优化区间进行了各生育期分配,合理分配了滴灌条件下各生育期水氮制度。研究成果可为沿黄南岸灌区玉米种植水肥管理模式和方案提供参考。
