Soybean cultivar Bei 92-28 was tested in this experiment in 2000 to study the coupling effect of water and ferilizer on soybean yield.The results showed that the effect of irrigation varied among the levels of fertili...Soybean cultivar Bei 92-28 was tested in this experiment in 2000 to study the coupling effect of water and ferilizer on soybean yield.The results showed that the effect of irrigation varied among the levels of fertilizer application,and vice versa;pods per plant,seeds per pod.and 100-seed weight had positive correlations with soybean yield,but the degrees of correlations of different treatments were various;LAI and dry matter accumulation could be significantly increased when watered and applied fertilizer with different levels,but high fertilizer application treatment didn't obtain the highest yield;watering could increase the absolute absorption amount of N,P,K in seeds,but the accumulation rates were various.展开更多
针对宁夏引黄灌区稻田施氮严重过量现象,在宁夏引黄灌区的青铜峡稻田,采用静态箱-气相色谱法,通过田间试验研究常规施氮(N300)、优化施氮(N240)和不施氮(N0)对水稻不同生育期CO_2、CH_4和N_2O通量以及稻田增温潜势(GWP)的影响。结果表明...针对宁夏引黄灌区稻田施氮严重过量现象,在宁夏引黄灌区的青铜峡稻田,采用静态箱-气相色谱法,通过田间试验研究常规施氮(N300)、优化施氮(N240)和不施氮(N0)对水稻不同生育期CO_2、CH_4和N_2O通量以及稻田增温潜势(GWP)的影响。结果表明:CO_2排放主要在水稻灌浆和成熟期,CH_4排放主要发生在水稻孕穗期,而N_2O排放关键期在水稻的分蘖和拔节期。与N0处理相比,施氮能显著增加稻田CO_2、CH_4和N_2O排放通量以及稻田GWP;常规施氮处理中CO_2、CH_4和N_2O的累积排放量分别为18 446.87、146.57 kg C·hm^(-2)和2.93 kg N·hm^(-2);为期一年的优化施氮没有显著增加水稻生育期内稻田CO_2排放,但使灌区稻田CH_4和N_2O排放分别显著降低了24.42%和36.28%。总的来看,为期一年的优化施氮使宁夏引黄灌区稻田GWP显著降低了26.70%。未来应结合土壤有机碳氮形态和含量变化以及土壤微生物技术,分析长期优化施氮对土壤温室气体通量的影响机制。展开更多
文摘Soybean cultivar Bei 92-28 was tested in this experiment in 2000 to study the coupling effect of water and ferilizer on soybean yield.The results showed that the effect of irrigation varied among the levels of fertilizer application,and vice versa;pods per plant,seeds per pod.and 100-seed weight had positive correlations with soybean yield,but the degrees of correlations of different treatments were various;LAI and dry matter accumulation could be significantly increased when watered and applied fertilizer with different levels,but high fertilizer application treatment didn't obtain the highest yield;watering could increase the absolute absorption amount of N,P,K in seeds,but the accumulation rates were various.
文摘针对宁夏引黄灌区稻田施氮严重过量现象,在宁夏引黄灌区的青铜峡稻田,采用静态箱-气相色谱法,通过田间试验研究常规施氮(N300)、优化施氮(N240)和不施氮(N0)对水稻不同生育期CO_2、CH_4和N_2O通量以及稻田增温潜势(GWP)的影响。结果表明:CO_2排放主要在水稻灌浆和成熟期,CH_4排放主要发生在水稻孕穗期,而N_2O排放关键期在水稻的分蘖和拔节期。与N0处理相比,施氮能显著增加稻田CO_2、CH_4和N_2O排放通量以及稻田GWP;常规施氮处理中CO_2、CH_4和N_2O的累积排放量分别为18 446.87、146.57 kg C·hm^(-2)和2.93 kg N·hm^(-2);为期一年的优化施氮没有显著增加水稻生育期内稻田CO_2排放,但使灌区稻田CH_4和N_2O排放分别显著降低了24.42%和36.28%。总的来看,为期一年的优化施氮使宁夏引黄灌区稻田GWP显著降低了26.70%。未来应结合土壤有机碳氮形态和含量变化以及土壤微生物技术,分析长期优化施氮对土壤温室气体通量的影响机制。
