长期施用有机肥情景下华北平原旱地土壤固碳及N2O排放的空间格局

doi:10.3864/j.issn.0578-1752.2022.06.009

Abstract

Abstract:

【Objective】To provide theoretical guidance for mitigating global warming, the comprehensive effects of manure amendment on soil organic carbon sequestration and greenhouse gas emissions were studied.【Method】Based on the long-term experiment, the validated process-based model-SPACSYS, combined with regional database and ArcGIS, was used to clarify the spatial characteristics of average annual soil organic carbon sequestration rate (SOC_SR), average annual soil N₂O emission and average annual net global warming potential (NGWP) under three long-term fertilization scenarios (equal nitrogen fertilization), namely, chemical fertilizers only (NPK), 50% of chemical fertilizers combined with 50% of manure (NPKM(5:5)) and 30% of chemical fertilizers combined with 70% of manure (NPKM(3:7)), from dry land in the North China Plain from 2010 to 2050.【Result】The SOC_SR from dry land in the North China Plain was higher in the east and lower in the west, and the higher regions mainly included Jiangsu Province and Shandong Province. Correlation analysis showed that there was a significant negative correlation between SOC_SR and initial soil organic carbon content. Stepwise linear regression analysis further indicated that initial soil organic carbon content, mean annual temperature and soil pH were three important factors affecting SOC_SR, which accounted for 24% of the variation of SOC_SR. The average annual soil N₂O emission was higher in the central part of the North China Plain, lower in the north and south, and the higher regions included parts of Shandong Province and Jiangsu Province. Correlation analysis showed that there was a significant positive correlation between average annual soil N₂O emission and initial soil organic carbon content. In general, compared with NPK, NPKM(5:5) and NPKM(3:7) both increased SOC_SR and decreased average annual soil N₂O emission from dry land in the North China Plain, of which SOC_SR (233 and 236 kg C·hm^-2·a^-1) increased by 79% and 82%, respectively, the average annual soil N₂O emission（15.8 and 14.4 kg N·hm^-2·a^-1) decreased by 21% and 28%, respectively. As a result, NGWP (6.6 and 5.9 t CO₂-eq·hm^-2·a^-1) decreased by 26% and 34%, respectively.【Conclusion】Compared with the application of chemical fertilizers, the application of chemical fertilizers combined with manure was beneficial to SOC sequestration, soil N₂O emission reduction and mitigation of glowing warming from dry land in the North China Plain over the long-term.

Key words: North China Plain, manure, soil organic carbon sequestration rate, N₂O emission, model

WANG ShuHui,TAO Wen,LIANG Shuo,ZHANG XuBo,SUN Nan,XU MingGang. The Spatial Characteristics of Soil Organic Carbon Sequestration and N₂O Emission with Long-Term Manure Fertilization Scenarios from Dry Land in North China Plain[J].Scientia Agricultura Sinica, 2022, 55(6): 1159-1171.

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施肥情景 Fertilization scenarios	土壤年均固碳速率Average annual SOC sequestration rate (kg C·hm^-2·a^-1)
施肥情景 Fertilization scenarios	北京 Beijing	天津 Tianjin	河北 Hebei	河南 Henan	山东 Shandong	江苏 Jiangsu	安徽 Anhui	华北平原 North China Plain
NPK	132±4	134±2	117±15	106±12	147±23	179±21	122±19	130±27
NPKM(5:5)	214±7	248±10	203±19	189±19	272±36	317±21	207±30	233±48
NPKM(3:7)	217±7	251±9	205±19	192±19	275±36	320±21	209±30	236±48

施肥情景 Fertilization scenarios	土壤N₂O年均排放量Average annual soil N₂O emission (kg N·hm^-2·a^-1)
施肥情景 Fertilization scenarios	北京 Beijing	天津 Tianjin	河北 Hebei	河南 Henan	山东 Shandong	江苏 Jiangsu	安徽 Anhui	华北平原 North China Plain
NPK	17.2±1.4	20.3±1.7	14.7±2.3	16.5±13	26.0±6.9	23.4±3.8	14.9±2.4	20.1±7.0
NPKM(5:5)	11.5±1.2	14.5±1.3	10.5±1.7	13.2±2.6	21.4±7.1	17.4±3.1	11.3±1.6	15.8±6.8
NPKM(3:7)	9.9±1.0	12.5±1.2	9.3±1.6	12.2±2.5	19.8±7.2	15.3±2.8	10.1±1.3	14.4±6.6

施肥情景 Fertilization scenarios	年均净全球增温潜势 Average annual net global warming potential (t CO₂-eq·hm^-2·a^-1)
施肥情景 Fertilization scenarios	北京 Beijing	天津 Tianjin	河北 Hebei	河南 Henan	山东 Shandong	江苏 Jiangsu	安徽 Anhui	华北平原 North China Plain
NPK	7.6±0.6	9.0±0.8	6.5±1.0	7.3±1.4	11.6±3.2	10.3±1.7	6.5±1.0	8.9±3.2
NPKM(5:5)	4.6±0.5	5.9±0.6	4.2±0.8	5.5±1.2	9.0±3.3	7.0±1.4	4.5±0.6	6.6±3.1
NPKM(3:7)	3.8±0.4	4.9±0.5	3.6±0.7	5.0±1.2	8.3±3.3	6.0±1.2	3.9±0.5	5.9±3.0

响应变量 Response index	解释变量 Variable included	回归方程Regression			参数Parameter
响应变量 Response index	解释变量 Variable included	F	显著性 Sig.	校正R²Adj. R²	系数Coefficient	t	显著性 Sig.
土壤年均固碳速率Average annual SOC sequestration rate (SOC_SR)	截距Intercept	20.42	<0.0001	0.24	851.78	6.77	<0.0001
	初始土壤有机碳含量Initial SOC content				-8.12	-7.52	<0.0001
	年均温MAT				-21.90	-3.98	<0.0001
	pH				-34.57	-3.06	0.003

The Spatial Characteristics of Soil Organic Carbon Sequestration and N₂O Emission with Long-Term Manure Fertilization Scenarios from Dry Land in North China Plain

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The Spatial Characteristics of Soil Organic Carbon Sequestration and N2O Emission with Long-Term Manure Fertilization Scenarios from Dry Land in North China Plain

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The Spatial Characteristics of Soil Organic Carbon Sequestration and N₂O Emission with Long-Term Manure Fertilization Scenarios from Dry Land in North China Plain