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加气灌溉水氮互作对温室芹菜地 N2O 排放的影响
杜娅丹1,2; 张倩1,2; 崔冰晶1,2; 谷晓博1; 牛文全1,2,3
Source Publication农业工程学报

为揭示加气条件下不同灌溉和施氮量对设施菜地N2O 排放的影响,提出有效的N2O 减排措施,该研究以温室芹
菜为例,设置充分灌溉(1.0 Ep,I1;Ep 为2 次灌水间隔内Φ20 cm 标准蒸发皿的累计蒸发量)和亏缺灌溉(0.75 Ep,I2)
2 个灌溉水平和0(N0)、150(N150)、200(N200)、250 kg/hm2(N250)4 个施氮水平,采用静态箱-气相色谱法对各处
理土壤N2O 的排放进行监测,并分析不同灌溉和氮肥水平下土壤温度、湿度、矿质氮(NH4
+-N 和NO3 – -N)、硝化细菌和
反硝化细菌的变化,以及对土壤N2O 排放的影响。结果表明:充分灌水温室芹菜地N2O 排放显著(P<0.05)高于亏缺灌
溉;施氮显著(P<0.05)增加了土壤N2O 排放,N150、N200 和N250 处理的N2O 累积排放量分别是N0 处理的2.30、4.14
和7.15 倍。设施芹菜地N2O 排放与土壤温度、湿度和硝态氮含量呈指数相关关系(P<0.01),与硝化细菌和反硝化细菌
N2O 排放。综合考虑产量和温室效应,施氮量150 kg/hm2、亏缺灌溉为较佳的管理模式。该研究为设施菜地N2O 减排及

Other Abstract

The global warming potential of nitrous oxide (N2O) is 298 times that of carbon dioxide (CO2), and N2O degrades
stratospheric ozone. Agriculture N2O emission accounts for 59% of anthropogenic N2O emission. Microbial nitrification and
denitrification are the major pathways of N2O production in soils. Synthetic fertilizers application in China is still the main way
in agricultural production, so the increase of N2O emissions might be inevitable. The annual synthetic nitrogen (N) fertilizer
consumption in China increased from 9.34×106 t in 1980 to 22.97×106 t in 2009, and it accounted for more than one fifth of the
total world consumption in 2007. The harvest area of vegetable crops rose from 9.5×106 hm2 in 1995 to 18.4×106 hm2 in 2010
in China and is still increasing. The fertilization rate for vegetable crops in China was 628.05 kg/hm2, nearly 2 times that for
cereal crops (314.4 kg/hm2) in 2006, of which N fertilizer occupied the largest share. The rough estimation showed that N2O
emissions from vegetable fields accounted for 20% of the total direct N2O emission and N emission accounted for 17% of total
N consumption nationally. Besides, agricultural practices such as irrigation and aeration potentially affect N2O emission from
soils through influencing soil physical and chemical characteristics to constrain soil microbial processes. However, the
microbial pathways of N2O production after N application and irrigation input in aerated condition are not well known. In
order to reveal the effects of water and nitrogen coupling on soil N2O emission characteristics under aerated irrigation, and
further put forward effective reduction measures, a field experiment with celery was conducted in greenhouse in Yangling
District of Shaanxi Province. The experiment adopted 2 irrigation levels (I1: full irrigation, 1.0 Ep; I2: deficit irrigation, 0.75
Ep. Ep is the cumulative evaporation from a 20 cm diameter pan between 2 irrigations) and 4 N levels (N0: 0 kg/hm2; N150:
150 kg/hm2; N200: 200 kg/hm2; N250: 250 kg/hm2), and 8 treatments in total. In the present study, the effects of irrigation
levels, nitrogen application amount, soil temperature and moisture, quantities of nitrifying bacteria and denitrifying bacteria on
soil N2O emission were also analyzed. The results showed that the N2O emission from the full irrigation treatment was
significantly higher than the deficit irrigation treatment. Nitrogen increased the cumulative N2O emission significantly under
the same irrigation level. The cumulative N2O emissions of N150, N200 and N250 treatments were 2.30, 4.14 and 7.15 times
that of N0 treatment in the whole growing season of celery, respectively. The correlation analysis showed that the significant
exponential relationships existed between soil N2O emission and soil temperature, water filled pore space (WFPS%), and
nitrate content. And the significant positive relationship was observed between soil N2O emission and nitrifier and denitrifier.
There was no relationship between soil N2O emission and soil ammonium content. Irrigation and fertilization were contributed
to the improvement of crop yield, but the soil N2O emission was also significantly increased. Therefore, the combination of N
application amount of 150 kg/hm2 and deficit irrigation was the best coupled mode of water and nitrogen to increase celery
yield and reduce N2O emission among the 4 treatments. It should be heavily emphasized in future in the Northwest China. The
results can provide valuable information for the selection of water-saving and nitrogen-saving method in Northwestern region.

Keyword土壤 温室气体 排放控制 N2o 排放 灌水
Indexed By中文核心期刊要目总览
Document Type期刊论文
2.西北农林科技大学 中国旱区节水农业研究院
Recommended Citation
GB/T 7714
杜娅丹,张倩,崔冰晶,等. 加气灌溉水氮互作对温室芹菜地 N2O 排放的影响[J]. 农业工程学报,2017,33(16):127-134.
APA 杜娅丹,张倩,崔冰晶,谷晓博,&牛文全.(2017).加气灌溉水氮互作对温室芹菜地 N2O 排放的影响.农业工程学报,33(16),127-134.
MLA 杜娅丹,et al."加气灌溉水氮互作对温室芹菜地 N2O 排放的影响".农业工程学报 33.16(2017):127-134.
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