江苏师范大学 地理测绘与城乡规划学院,江苏,徐州,221116
纸质出版:2018
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李强, 李建国, 张忠启, 等. 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.
LI Qiang, LI Jianguo, ZHANG Zhongqi, et al. Optimizing N-Fertilizer Inputs for Rice Production in Coastal Saline Based on a Biogeochemical Model and Dichotomy[J]. Bulletin of Soiland Water Conservation, 2018, 38(3): 167-173.
李强, 李建国, 张忠启, 等. 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. DOI: 10.13961/j.cnki.stbctb.20180426.001.
LI Qiang, LI Jianguo, ZHANG Zhongqi, et al. Optimizing N-Fertilizer Inputs for Rice Production in Coastal Saline Based on a Biogeochemical Model and Dichotomy[J]. Bulletin of Soiland Water Conservation, 2018, 38(3): 167-173. DOI: 10.13961/j.cnki.stbctb.20180426.001.
[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/hm
2
和7 686.51,7 739.94,7 739.94 kg/hm
2
;②最佳施氮区间在增施10%~20%,即施氮区间为519.0~566.18 kg/hm
2
。经二分法测算,该地最佳施氮量为528.214 kg/hm
2
;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/hm
2
,具有良好环境效益。[结论
]
水稻全生长期内施用528.214 kg/hm
2
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。
[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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