秸秆还田与施氮对耕层土壤有机碳储量、组分和团聚体的影响

doi:10.3864/j.issn.0578-1752.2023.20.009

Abstract

Abstract:

【Objective】The results of carbon sequestration studies on combining straw returning with nitrogen fertilizer are controversial. Aimed at such problem, this experiment was carried out to reveal the effects of combining straw returning with nitrogen fertilizer on Carbon sequestration capacity and mechanism of farmland, so as to provide a reference for the future research. 【Method】Based on 11 years of long-term positioning experiments, this paper adopted split-zone design, the main treatment included straw returning to soil and removal straw from field, and the subplots included three N application rate, which were no nitrogen (N0), 168 kg·hm^-2 (N168, nitrogen), and 336 kg·hm^-2 (N336, excessive nitrogen application). 【Result】Compared with wheat without nitrogen fertilizer, wheat yield increased by 14.4%-19.5% with nitrogen fertilizer. The effect of straw returning to the field on yield was not significant. Straw returning significantly increased the cumulative input of soil carbon by 70.8% (P<0.05), but had no significant effect on soil organic carbon storage. Compared N0, the nitrogen application significantly increased soil carbon accumulation input and soil organic carbon storage by 7.7%-8.5% (P<0.05) and 4.7%-8.1% (P<0.05), respectively. The application of nitrogen fertilizer significantly increased the carbon fixation rate by 32.7%-56.1% (P<0.05), and N336 significantly increased the soil carbon fixation efficiency by 51.8% (P<0.05); straw returning to the field did not significantly improve the soil carbon fixation rate, but significantly reduced the carbon fixation efficiency by 30.9% (P<0.05). Both nitrogen application and straw returning could improve soil carbon pool capacity, and N0 and N168 have reached carbon saturation. The content of soluble organic carbon (DOC), microbial biomass carbon (MBC) and easily oxidized organic carbon (EO) in the soil increased by 4.6%, 11.2% and 4.5% respectively after returning straw to the field. Compared N0, DOC under N168 and N336 increased by 14.12% and 29.54% respectively; MBC decreased by 14.0% and 28.0% on average, respectively; EO increased by 8.2% and 11.5%, respectively. Straw returning to the field was beneficial to the improvement of soil DOC/SOC and microbial entropy. Applying nitrogen fertilizer was beneficial to the increase of DOC/SOC, but reduced the microbial entropy. Both straw returning and nitrogen fertilizer application had no effect on soil EO/SOC. Both straw returning and nitrogen application were beneficial to the improvement of macroaggregates (>0.25 mm), and straw returning significantly increased the organic carbon content of macroaggregates by 5.2%. The average weight diameter (MWD) and geometric average diameter (GMD) of aggregates under non-return showed a trend of first increasing and then decreasing with the increase of nitrogen level, while under straw returning, it showed an increase with the increase of nitrogen level. Straw returning increased the MWD and GMD of aggregates by 8.8% and 7.5% respectively, and the application of nitrogen fertilizer increased the MWD and GMD by 14.1%-22.7% and 16.8%-23.4% respectively, compared with CK. Both straw returning and nitrogen application could improve the distribution of organic carbon in large aggregates. 【Conclusion】Straw returning with nitrogen fertilizer could increase carbon input, increase activated organic carbon content, reduce microbial activity, and improve the protection of organic carbon by aggregates.

Key words: straw returning, nitrogen fertilizer, tillage layer, carbon storage, activated carbon components, aggregates

GUO RongBo, LI GuoDong, PAN MengYu, ZHENG XianFeng, WANG ZhaoHui, HE Gang. Effects of Long-Term Straw Return and Nitrogen Application Rate on Organic Carbon Storage, Components and Aggregates in Cultivated Layers[J].Scientia Agricultura Sinica, 2023, 56(20): 4035-4048.

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项目 Item	小麦产量 Wheat yield	碳投入量 CI	碳储量 SOC_S	固碳速率 SOC_SR	固碳效率SOC_SE	微生物量碳 MBC	可溶性有机碳 DOC	易氧化碳 EO	平均重量直径 MWD	几何平均直径 GMD
秸秆还田 Straw returning (S)	0.002^NS	14511^**	5.5^NS	5.5^NS	22.3^**	8.5^**	0.6^NS	1.8^NS	2.2^NS	1.9^NS
氮肥用量 N rate (N)	47.2^**	36.3^**	6.4^*	6.4^*	4.4^**	45.6^**	6.5^**	4.3^*	13.1^**	14^**
N╳S	1.4^NS	1.1^NS	0.5^NS	0.5^NS	1.3^NS	1.1^NS	0.12^NS	0.5^NS	6.6^**	3.2^NS

处理 Treatment	有机碳储量 SOCs (t·hm^-2)	固碳量 ∆SOCs( t·hm^-2)	固碳速率 SOC_SR (kg·hm^-2·a^-1)	固碳效率 SOC_SE (%)
N0	30.0 b	3.6 b	331.0 b	8.2 bc
N168	31.9 ab	5.5 ab	501.4 ab	11.6 ab
N336	33.2 a	6.8 a	620.1 a	14.3 a
S+N0	31.7 ab	5.3 ab	480.7 ab	7.0 c
S+N168	32.7 a	6.3 a	575.6 a	7.8 bc
S+N336	33.5 a	7.1 a	646.8 a	8.8 bc

处理 Treatment	可溶性有机碳/总有机碳 DOC/SOC (%)	微生物熵 MBC/SOC (%)	易氧化有机碳/总有机碳 EO/SOC (%)
N0	1.6 b	1.2 a	25.6 a
N168	1.7 ab	1.0 ab	27.1 a
N336	1.8 ab	0.8 b	26.4 a
S+N0	1.5 b	1.3 a	26.5 a
S+N168	1.7 ab	1.0 ab	26.7 a
S+N336	1.9 a	0.9 ab	27.0 a

项目 Item	处理 Treatment	团聚体大小 Aggregate size (mm)
项目 Item	处理 Treatment	>2	2-1	1-0.5	0.5-0.25	<0.25
团聚体组成 Aggregate composition (%)	N0	7.7 b	10.0 c	21.8 c	18.7 a	41.9 a
	N168	9.4 ab	12.3 b	30.0 ab	18.0 ab	33.3 c
	N336	8.2 b	12.0 bc	26.3 ab	19.8 a	33.8 bc
	S+N0	7.8 b	11.0 bc	23.9 bc	18.5 a	38.9 ab
	S+N168	8.1 b	12.9 b	27.2 a	18.5 a	33.3 c
	S+N336	11.8 a	15.7 a	28.7 a	15.7 b	29.7 c
团聚体有机碳含量 SOC of aggregates (g·kg^-1)	N0	13.7 ab	13.5 b	12.9 ab	11.0 ab	11.1 ab
	N168	12.8 b	13.7 ab	12.4 ab	10.6 b	11.0 b
	N336	14.61 a	14.0 ab	12.1 b	10.5 b	10.7 b
	S+N0	14.1 ab	14.1 ab	12.9 ab	10.8 ab	10.7 b
	S+N168	14.4 a	14.0 ab	13.2 a	11.4 a	11.6 ab
	S+N336	15.2 a	14.7 a	13.0 a	11.1 ab	12.1 a
团聚体有机碳分布 Distribution percentage of SOC in aggregates (%)	N0	9.1 b	11.2 c	23.4 c	17.1 a	39.1 a
	N168	10.2 ab	14.3 b	28.3 ab	16.1 a	31.1 bc
	N336	10.1b	14.2 b	27.3 ab	17.7 a	30.7 bc
	S+N0	9.2 b	12.9 bc	26.0 b	16.7 a	35.1 ab
	S+N168	9.4 b	14.3 b	28.6 a	16.8 a	30.8 bc
	S+N336	13.5 a	17.5 a	28.3 a	13.3 b	27.3 c

Effects of Long-Term Straw Return and Nitrogen Application Rate on Organic Carbon Storage, Components and Aggregates in Cultivated Layers

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