Effects of short-term nitrogen and phosphorus addition on soil greenhouse gas emissions under different moisture conditions in the Hui River Basin of Hulun Buir

doi:10.11686/cyxb2023110

Abstract

Abstract:

The addition of nutrients as fertilizers greatly affects soil greenhouse gas （GHG） emissions in grassland， but the response of soil GHG emissions to nutrient addition in grasslands under different flooding conditions remains unclear. The effects of nitrogen （N）， phosphorus （P） and nitrogen plus phosphorus （N+P） on soil GHG fluxes （CO₂， CH₄， and N₂O） from seasonally flooded （PF） and non-flooded dry grassland （NF） at the edge of a riparian zone were investigated using a split-plot design in the Hulun Buir Hui River Basin in 2021. The results showed that： 1） The CO₂ emission from NF with P was significantly higher than that from PF with P （P<0.05）， and the CH₄ emission from NF with N+P was extremely significantly higher than that of PF with N+P （P<0.01）. Compared with N₂O fluxes from PF and NF without nutrient addition， those from PF and NF with N， P， and N+P were significantly increased by 38.81%， 90.09%， and 124.94%， respectively. 2） Nutrient addition increased the cumulative emissions of GHG from grassland soils with different moisture contents. The maximum cumulative GHG emissions were consistent in the PF and NF treatments after the addition of nutrients. The highest cumulative emissions of CO₂ from soil were in the N addition treatments， and were 95.92% and 49.01% higher in PF with N and NF with N， respectively， than in their respective controls. The highest cumulative emissions of CH₄ from soil were in the P addition treatments， and were increased by 190.64% and 32.62% in PF with P and NF with P， respectively， compared with their respective controls. The maximum cumulative emissions of N₂O from soil were in the N+P treatments， and were about three times higher than that in the control. 3） The global warming potential （GWP） of NF with added nutrients was higher than that of PF with added nutrients， and the GWP of NF and PF treatments was highest with P addition （32.66% and 178.69% higher than those of their respective controls， respectively）. 4） The structural equation model showed that flooding conditions negatively affected soil CO₂ and CH₄ fluxes， nutrient addition had a positive effect， and both flooding conditions and nutrient addition positively affected soil N₂O fluxes. Flooding conditions and nutrient addition affected soil CO₂ and CH₄ fluxes mainly by influencing soil physical properties and nutrient contents， and affected soil N₂O fluxes by influencing soil physical properties and nutrient contents and by changing the aboveground plant biomass.

Key words: soil greenhouse gases, nitrogen and phosphorus addition, flooding condition, meadow grassland, Hui River Basin

Yan QU, Kun ZHAO, Zi-chen HAN, Shi-hai LV, Qiang WO, Yu-ping RONG. Effects of short-term nitrogen and phosphorus addition on soil greenhouse gas emissions under different moisture conditions in the Hui River Basin of Hulun Buir[J]. Acta Prataculturae Sinica, 2024, 33(2): 68-79.

Figures/Tables 6

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项目 Item	TLU		NA		TLU * NA
项目 Item	P	F	P	F	P	F
土壤全碳 Soil total carbon （TC， g·kg^-1）	**	54.78	**	15.25	**	7.40
土壤全氮 Soil total nitrogen （TN， g·kg^-1）	**	166.91	ns	0.70	ns	0.95
土壤全磷 Soil total phosphorus （TP， g·kg^-1）	**	102.58	ns	0.15	ns	0.14
土壤有机碳 Soil organic carbon （SOC， mg·kg^-1）	**	179.73	ns	0.32	ns	0.28
土壤铵态氮 Ammonium nitrogen （NH₄⁺-N， mg·kg^-1）	**	39.97	**	9.07	**	11.39
土壤硝态氮 Nitrate nitrogen （NO₃^--N， mg·kg^-1）	**	16.79	ns	0.21	ns	0.56
土壤速效磷 Available phosphorus （AP， mg·kg^-1）	**	10.20	**	29.30	**	30.77
土壤温度 Soil temperature （ST， ℃）	**	21.63	ns	0.09	ns	0.17
土壤水分 Soil water content （SW， %）	**	1478.15	*	2.86	**	5.41
土壤pH值 Soil pH value （pH）	**	197.49	ns	0.47	ns	0.51

项目 Item	TLU		NA		TLU * NA
项目 Item	P	F	P	F	P	F
土壤全碳 Soil total carbon （TC， g·kg^-1）	**	54.78	**	15.25	**	7.40
土壤全氮 Soil total nitrogen （TN， g·kg^-1）	**	166.91	ns	0.70	ns	0.95
土壤全磷 Soil total phosphorus （TP， g·kg^-1）	**	102.58	ns	0.15	ns	0.14
土壤有机碳 Soil organic carbon （SOC， mg·kg^-1）	**	179.73	ns	0.32	ns	0.28
土壤铵态氮 Ammonium nitrogen （NH₄⁺-N， mg·kg^-1）	**	39.97	**	9.07	**	11.39
土壤硝态氮 Nitrate nitrogen （NO₃^--N， mg·kg^-1）	**	16.79	ns	0.21	ns	0.56
土壤速效磷 Available phosphorus （AP， mg·kg^-1）	**	10.20	**	29.30	**	30.77
土壤温度 Soil temperature （ST， ℃）	**	21.63	ns	0.09	ns	0.17
土壤水分 Soil water content （SW， %）	**	1478.15	*	2.86	**	5.41
土壤pH值 Soil pH value （pH）	**	197.49	ns	0.47	ns	0.51

处理 Treatment	地上生物量 Above ground biomass （AB， g·m^-2）		根系生物量 Root biomass （RB， g·m^-2）		凋落物生物量 Litter biomass （LB， g·m^-2）
处理 Treatment	P	F	P	F	P	F
TLU	**	11.63	ns	0.02	**	66.97
NA	ns	2.76	ns	0.76	ns	1.48
TLU * NA	ns	0.18	ns	0.61	ns	1.60

处理 Treatment	地上生物量 Above ground biomass （AB， g·m^-2）		根系生物量 Root biomass （RB， g·m^-2）		凋落物生物量 Litter biomass （LB， g·m^-2）
处理 Treatment	P	F	P	F	P	F
TLU	**	11.63	ns	0.02	**	66.97
NA	ns	2.76	ns	0.76	ns	1.48
TLU * NA	ns	0.18	ns	0.61	ns	1.60

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