文章摘要
李强,李建国,张忠启,茆彭.基于DNDC模型与二分法的滨海盐渍土水稻最佳施氮量研究[J].水土保持通报,2018,38(3):167~173
基于DNDC模型与二分法的滨海盐渍土水稻最佳施氮量研究
Optimizing N-Fertilizer Inputs for Rice Production in Coastal Saline Based on a Biogeochemical Model and Dichotomy
投稿时间:2017-10-06  修订日期:2017-12-29
DOI:10.13961/j.cnki.stbctb.20180426.001
中文关键词: 施氮量  水稻产量  环境效益  DNDC模型  二分法
英文关键词: nitrogen application amount  rice yield  environmental benefit  DNDC model  dichotomy
基金项目:国家自然科学基金项目“滨海地区盐渍土改良对土壤有机碳固持的影响机理”(41701371),“采样点布置和空间预测对揭示红壤区土壤有机碳变异性的影响”(41201213);教育部人文社会科学研究一般项目(17YJCZH085);江苏省研究生科研创新计划(KYCX17_1686)
作者单位E-mail
李强 江苏师范大学 地理测绘与城乡规划学院, 江苏 徐州 221116  
李建国 江苏师范大学 地理测绘与城乡规划学院, 江苏 徐州 221116 lijianguo531@126.com 
张忠启 江苏师范大学 地理测绘与城乡规划学院, 江苏 徐州 221116  
茆彭 江苏师范大学 地理测绘与城乡规划学院, 江苏 徐州 221116  
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中文摘要:
      [目的]探讨滨海盐渍土水稻田的最佳施氮量,为研究区科学施氮提供一定决策依据。[方法]基于DNDC模型与数学二分法,模拟水稻在加施10%,20%,30%和减施10%,20%,30%等6种施氮条件下产量变化特征,划定最佳施氮量所在区间,并对最佳施肥量下的环境效益进行评价。[结果]①在减施10%,20%,30%和增施10%,20%,30%氮肥时,水稻产量依次为6 431.67,5 939.22,5 439.66 kg/hm2和7 686.51,7 739.94,7 739.94 kg/hm2;②最佳施氮区间在增施10%~20%,即施氮区间为519.0~566.18 kg/hm2。经二分法测算,该地最佳施氮量为528.214 kg/hm2;③采用该最佳施氮量时,水稻种植期间总氮氧化合物排放量为9.24 kg/hm2,具有良好环境效益。[结论]水稻全生长期内施用528.214 kg/hm2的氮肥,滨海盐渍土水稻田产量达到最大值,兼具良好环境效益。
英文摘要:
      [Objective] Determing the optimal amount of N-fertilizer inputs for rice production is significant to improve the agricultural management in the coastal saline reclamation area, Eastern China.[Methods] Combining denitrification decomposition model(DNDC) and dichotomy method, this study simulated rice yield dynamics during the whole life cycle under six fertilization situations (10%, 20%, 30%, -10%, -20% and -30% of additional N-fertilizer inputs). And the optimal interval of N-fertilizer inputs and corresponding ecological impacts were explored.[Results] ① The rice yield in the study area was 6 431.67, 5 939.22, 5 439.66, 7 686.51, 7 739.94 and 7 739.94 kg/hm2 10%, 20%, 30%, -10%, -20% and -30% N-fertilizer inputs, respectively. ② The optimal interval of fertilization was from 10% to 20% of additional fertilizer inputs, namely, 519.0~566.18 kg/hm2 of N-fertilizer inputs. And the optimal N-fertilizer inputs was 528.214 kg/hm2, according to dichotomy analysis. ③ Based on the optimal amount of N-fertilizer inputs, the nitrogen oxide emission was 9.24 kg/hm2 during full rice growth period, which showed a good environmental benefit.[Conclusion] The optimal amount of N-fertilizer inputs during rice production in the study area is 528.214 kg/hm2. This optimal N-fertilizer inputs, can improve the rice yields of saline soil to the top level and produce a better environmental benefit.
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