Scientia Agricultura Sinica ›› 2021, Vol. 54 ›› Issue (5): 992-1002.doi: 10.3864/j.issn.0578-1752.2021.05.011

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Effects of Irrigation Regimes on N2O and NO Emissions from Greenhouse Soil

LiYuan ZHANG(),JinDong LÜ,XinYue SHI,Na YU(),HongTao ZOU,YuLing ZHANG,YuLong ZHANG   

  1. College of Land and Environment, Shenyang Agricultural University/Key Laboratory of Arable Land Conservation (Northeast China), Ministry of Agriculture and Rural Affairs/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shenyang 110866
  • Received:2020-05-22 Accepted:2020-06-28 Online:2021-03-01 Published:2021-03-09
  • Contact: Na YU E-mail:zhangliyuan1027@163.com;sausoilyn@syau.edu.cn

Abstract:

【Objective】 Reasonable irrigation in greenhouse is an effective measure to control N2O and NO emissions and to improve utilization rate of nitrogen fertilizer. In order to provide a scientific basis for N2O and NO emission reduction and soil irrigation management in greenhouse, the dynamics of soil N2O and NO emissions under different irrigation regimes and its relationship with soil moisture and inorganic nitrogen and soluble organic nitrogen were studied, and the N2O and NO emissions characteristics and its influencing factors were also analyzed.【Method】A seven-year long term field experiment was conducted in greenhouse, tomatoes were used as the experimental crop, and four irrigation regimes were conducted to control lower irrigation limits of 25 kPa (W1), 35 kPa (W2), 45 kPa (W3) and 55 kPa (W4), respectively. The N2O and NO emission were monitored in-situ simultaneously by using closed static chamber-gas chromatography and NOx analyzer, respectively. 【Result】 The soil N2O and NO emission fluxes of different irrigation regimes varied between -34.46-1 671.78 μg N·m-2·h-1and 6.83-269.89 μg N·m-2·h-1 in tomato growing season, respectively. The peak periods of N2O and NO emissions were synchronous and mainly occurred after fertilization and irrigation, and NO/N2O was less than 1 for each treatment. The cumulative soil N2O and NO emissions were the lowest under W2 and W1 treatments (P <0.01) respectively, and the total N2O+NO emissions for each treatment were W4 >W3 >W1 >W2. Compared with W1, W3 and W4 treatments, tomato yields under W2 treatment was increased by 84%, 32.4% and 12%, respectively. The yield-scaled N2O+NO emissions was the highest under W4 treatment and the lowest under W2 treatment (P <0.01). Repeated measurements anova of soil inorganic nitrogen and soluble organic nitrogen after fertilizations and harvest showed that except for the interaction of irrigation regime and measure time had no significant effect on the nitrite content, irrigation regimes, measure time and their interaction had a significant effect on soil inorganic nitrogen and soluble organic nitrogen (P <0.01). Redundancy and correlation analysis indicated that NO2--N, NH4+-N and WFPS could explain 55%, 32.5% and 20.7% variations of N2O and NO for greenhouse soil, which were the main influencing factors that affected N2O and NO emissions very significantly under different irrigation regimes.【Conclusion】Comprehensive consideration of yield, N2O and NO emission reduction effect, W2 treatment with irrigation lower limit of 35 kPa was the most appropriate irrigation management measurement for this experiment condition.

Key words: irrigation low limits, greenhouse soil, N2O emission, NO emission

Table 1

Soil basic physiochemical properties before the experiment in 2012"

有机质
Organic matter
(g·kg-1)
全氮
Total N
(g·kg-1)
碱解氮
Available N (mg·kg-1)
速效磷
Available P (mg·kg-1)
速效钾
Available K (mg·kg-1)
容重
Bulk density (g·cm-3)
pH
10.9 1.4 57.8 25.2 90.2 1.51 7.0

Table 2

Irrigation frequency, total irrigation amount and average single irrigation amount under different irrigation regimes"

处理
Treatment
灌水次数
Irrigation time
总灌水量
Total irrigation amount (m3·hm-2)
平均单次灌水量
Average single irrigation amount (m3·hm-2)
W1 29 2957.2 102.0
W2 23 2543.8 110.6
W3 19 2274.0 119.7
W4 16 2102.0 131.4

Fig. 1

Dynamic of flux and cumulative of N2O emissions under different irrigation regimes (Arrows for fertilization)"

Fig. 2

Dynamic of flux and cumulative of NO emissions under different irrigation regimes (Arrows for fertilization)"

Table 3

Tomato yield and NO and N2O emission indexes from soil under different irrigation regimes"

处理
Treatment
番茄产量
Tomato yield (×103 kg·hm-2)
N2O+NO总累积排放量
N2O+NO total cumulative emissions (kg N·hm-2)
单位产量N2O+NO排放
Yield-scaled N2O+NO (×10-3g·kg-1)
NO/N2O
W1 40.38±1.04dC 1.90±0.01cC 47.01±1.49aA 0.49±0.01dD
W2 74.31±1.55aA 1.75±0.03dC 23.60±0.65cC 0.89±0.01aA
W3 56.13±2.81cB 2.14±0.04bB 38.32±1.54bB 0.65±0.01cC
W4 66.34±2.91bAB 3.12±0.04aA 47.15±1.83aA 0.74±0.01bB

Fig. 3

Dynamic changes of soil water filled pore space under different irrigation regimes"

Fig. 4

The soil inorganic nitrogen and soluble organic nitrogen content under different irrigation regimes"

Table 4

Correlation analysis of soil N2O, NO, inorganic nitrogen, soluble organic nitrogen and WFPS under different irrigation regimes"

项目
Item
N2O NO 铵态氮
NH4+-N
硝态氮
NO3--N
亚硝态氮
NO2--N
可溶性总氮STN 可溶性有机氮SON WFPS
N2O 1 0.696** 0.619** -0.036ns 0.884** -0.050ns -0.093ns 0.415**
NO 1 0.509** -0.051ns 0.622** -0.136ns -0.168ns 0.435**
NH4+-N 1 0.213ns 0.577** 0.119ns -0.146ns 0.319**
NO3--N 1 -0.086ns 0.696** 0.008ns -0.472**
NO2--N 1 -0.168ns -0.189ns 0.474**
STN 1 0.688** -0.602**
SON 1 -0.399**
WFPS 1

Fig. 5

Redundancy analysis of soil N2O and NO and its influencing factor"

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