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Journal of Zhejiang University (Agriculture and Life Sciences)  2019, Vol. 45 Issue (3): 332-342    DOI: 10.3785/j.issn.1008-9209.2018.03.061
Resource utilization & environmental protection     
Effects of rice-crab culture on nitrogen leaching in rice fields in the north of China.
Ang WANG1,2,3(),Danchao DAI1,3,Xuzhou MA1,3(),Qun MOU4,Yongqing YU5,Weiqun Lü1,2()
1. National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
2. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
3. Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding/Shanghai Engineering Research Center of Aquaculture/Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China
4. Huai’an Higher Vocational School of Biological Engineering, Huai’an 223200, Jiangsu, China
5. Panshan Research Institution of Crab Technology, Panjin 124000, Liaoning, China
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Abstract  

In order to explore the leaching loss of nitrogen (N) in the rice-crab culture system, a field experiment was carried out in Panjin, Liaoning Province. A split-plot design with two factors was arranged in this experiment, with crab or without crab as main factors, with or without N fertilizer as sub-factors. The treatments included: 1) rice monoculture without N fertilizer (R0M); 2) rice-crab culture without N fertilizer (R0C); 3) rice monoculture with N fertilization (with N of 160 kg/hm2, R1M); 4) rice-crab culture with N fertilizer (with N of 160 kg N/hm2, R1C). The results showed that NH4 +-N was the primary form of N in flooding water, accounting for 50.8% of the total N (TN), while NO3 -N contributed the most to N in leaching water, accounting for 58.5% of TN. Fertilization could significantly increase the concentrations of microbial biomass nitrogen (MBN) in soil, N in flooding and leaching water (P<0.05). The mean concentration of soil MBN in rice-crab field was 17.7% higher than that in rice monoculture. Rearing crab significantly increased the concentration of MBN in soil and reduced leaching losses of NO3 -N (P<0.05), but had little effect on N concentrations in flooding water and leaching losses of NH4 +-N and dissolved organic nitrogen (DON). The concentration of NO3 -N in the leaching water showed positive correlation with NO3 -N in flooding water (P<0.01), while the concentration of DON in the leaching water was negatively correlated with the concentration of soil MBN (P<0.01). The cumulative TN leaching of R1M and R1C treatments was 7.6% and 6.3%, respectively, which indicated that the N leaching was not the predominant fertilizer N losses. Rearing crab in rice fields could reduce the cumulative TN leaching by 15.0% at fertilized plots (P<0.05), and 7.2% at no fertilized plots (P>0.05). All in all, the integration of rice and crab cultivation effectively reduces the leaching loss of N fertilizer in rice field.



Key wordsrice-crab culture      fertilization      microbial biomass nitrogen in soil      leaching losses of nitrogen      correlation     
Received: 06 March 2018      Published: 25 June 2019
CLC:  S 966.16  
Corresponding Authors: Xuzhou MA,Weiqun Lü     E-mail: karso135@163.com;xzma@shou.edu.cn;wqlv@shou.edu.cn
Cite this article:

Ang WANG,Danchao DAI,Xuzhou MA,Qun MOU,Yongqing YU,Weiqun Lü. Effects of rice-crab culture on nitrogen leaching in rice fields in the north of China.. Journal of Zhejiang University (Agriculture and Life Sciences), 2019, 45(3): 332-342.

URL:

http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2018.03.061     OR     http://www.zjujournals.com/agr/Y2019/V45/I3/332


北方稻蟹共作对水体氮素淋溶损失的影响

为探索稻蟹共作系统水体氮(N)素的淋溶损失,在辽宁省盘锦市开展田间试验。试验采用二因素裂区设计,以养蟹为主因素,施N肥为副因素,设置4个处理,即单作稻不施N肥(R0M),稻蟹共作不施N肥(R0C),单作稻施N肥(施N量为160 kg/hm2, R1M)和稻蟹共作施N肥(160 kg/hm2, R1C)。结果表明:铵态氮(NH4 +-N)是田面水中N素存在的主要形态,占田面水中总N(total nitrogen, TN)含量的50.8%;硝态氮(NO3 -N)是淋溶水N素的主要形态,占TN淋溶量的 58.5%。施肥可以显著提高土壤微生物量N(microbial biomass nitrogen, MBN)含量、田面水N素和淋溶水N素含量(P<0.05)。养蟹稻田的土壤MBN含量较单作稻田提高了17.7%。养蟹可以显著降低淋溶水NO3 -N含量(P<0.05),但是对田面水N素、淋溶水铵态氮(NH4 +-N)和可溶性有机氮(dissolved organic nitrogen, DON)含量影响较小。淋溶水NO3 --N含量与田面水NO3 -N含量呈线性正相关(P<0.01),淋溶水DON含量与土壤MBN含量呈线性负相关(P<0.01)。R1M和R1C处理的TN淋溶量分别占当季施肥量的7.6%和 6.3%,N淋溶不是肥料中N素损失的主要途径。在施肥条件下,养蟹降低了15.0%的TN淋溶量(P<0.05),而在不施肥条件下,降低了7.2%的TN淋溶量(P>0.05)。说明稻蟹共作模式可以有效地降低稻田肥料N素的淋溶损失。


关键词: 稻蟹共作,  施肥,  土壤微生物量氮,  氮素淋溶损失,  相关性 
Fig. 1 Dynamic change of microbial biomass nitrogen (MBN) content in soil under different treatments
Fig. 2 Dynamic change of N concentrations in flooding water under different treatments
Fig. 3 Dynamic change of N concentrations in leaching water under different treatments
处理Treatments NH4 +-N/(kg/hm2) NO3 -N/(kg/hm2) DON/(kg/hm2) TN/(kg/hm2)
平均 Average 1.81 (23.0) 4.61 (58.5) 1.46 (18.5) 7.88
R0M 1.03±0.11b (20.6) 3.02±0.08c (60.5) 0.94±0.23b (18.8) 5.00±0.22c
R0C 1.20±0.06b (25.8) 2.54±0.50d (54.8) 0.90±0.10b (19.3) 4.64±0.59c
R1M 2.65±0.22a (22.4) 7.08±0.42a (59.8) 2.12±0.26a (17.9) 11.84±0.81a
R1C 2.38±0.23a (23.6) 5.80±0.27b (57.6) 1.89±0.21a (18.7) 10.06±0.40b
Table 1 Cumulative leaching of total NH4 +-N, NO3 -N, DON and TN under different treatments
Fig. 4 TN leaching content in paddy fields
Fig. 5 Correlation between NO3 -N concentrations in leaching water and NO3 -N concentrations in flooding water
Fig. 6 Correlation between DON concentrations in leaching water and MBN concentrations in soil under R0M and R0C treatments
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