地膜覆盖与施肥对秸秆碳氮在土壤中固存的影响

doi:10.3864/j.issn.0578-1752.2021.02.010

Abstract

Abstract:

【Objective】Crop straws not only contain high content of organic carbon (C), but also are rich in mineral nutrients. Straw returning to field is an important technique for improvement of soil fertility and sustainable development of agriculture in the region of Black Soil in Northeast China. However, the sequestration and characteristics of C and nitrogen (N) from straw in soil under different plastic film mulching and fertilization treatments were not clear. In this study, the contributions of straw C to soil organic C (SOC) and straw N to soil total nitrogen (TN) were quantified to compare the differences of straw C and N in soil among different mulching and fertilization treatments, so as to provide a basis for improvement of soil fertility and protection of Black Soil in Northeast China.【Method】Based on a long-term mulching and fertilization experiment, the ¹³C¹⁵N double-labeled straw was added to the topsoil (0-20 cm) from the different fertilization treatments, including no fertilization (CK), chemical N fertilizer application (N₄), and organic manure combined with chemical N fertilizer (M₂N₂), with/without mulching, and then which were incubated in-situ in the field for 150 days. The contents of SOC and TN and the values of δ¹³C and δ ¹⁵N were measured to analyze the dynamics changes of SOC derived from straw C (¹³C-SOC), TN derived from straw N (¹⁵N-TN) and their ratio with time.【Result】Fertilization, mulching and their interactions significantly influenced the contents of ¹³C-SOC and ¹⁵N-TN (P<0.05). During the whole incubation period, the contribution percentage of¹³C-SOC to SOC (¹³C-SOC/SOC) and that of ¹⁵N-TN to TN (¹⁵N-TN/TN) were 10.48% and 3.18% under M₂N₂ treatment, respectively; the¹³C-SOC/SOC and residual percentage of straw C in soil under fertilization (N₄and M₂N₂) treatments were on average 12.65% and 37.14% under mulching, and averaged 12.08% and 34.50% under no mulching, respectively. On the 150^th day of incubation under the same cultivation mode, the ¹³C-SOC/SOC and residual percentage of straw C in soil were on average 14.33% and 39.40% under N₄treatment and averaged 11.77% and 33.21% in the other fertilization treatments, respectively;¹⁵N-TN/TN under CK treatment was with an average of 4.56%, and was 26.00% and 44.53% higher than that in N₄ and M₂N₂ treatments. The residual percentage of straw N was the highest under CK treatment with/without mulching, with an average of 10.03%, which was the lowest under N₄ treatment without mulching, with a value of 7.87% on the 150^th day of incubation. Regardless of mulching or not, the ratio of ¹³C-SOC to ¹⁵N-TN ranged from 32 to 39 in N₄ treatment, but was lower than 30 in the other fertilization treatments. 【Conclusion】The sequestrations of straw C and N in soil were sensitive to mulching and fertilization. The single application of chemical N fertilizer promoted the accumulation of straw C and the renewal of organic C in soil, and the long-term no fertilization played a positive feedback effect on the sequestration of straw N in soil N pool, while the renewal of soil organic C and N in organic manure combined with chemical N fertilizer lagged behind that in the other fertilization treatments.

Key words: ¹³C¹⁵N double-labeling, straw carbon, straw nitrogen, plastic film mulching, fertilization

WANG ShuYing,LI XiaoHong,CHENG Na,FU ShiFeng,LI ShuangYi,SUN LiangJie,AN TingTing,WANG JingKuan. Effects of Plastic Film Mulching and Fertilization on the Sequestration of Carbon and Nitrogen from Straw in Soil[J].Scientia Agricultura Sinica, 2021, 54(2): 345-356.

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栽培模式 Cultivation mode	施肥处理 Fertilization treatment	土壤总有机碳 Total soil organic carbon (g·kg^-1)	δ¹³C值 δ¹³C value (‰)	全氮 Total nitrogen (g· kg^-1)	δ¹⁵N值 δ¹⁵N value (‰)	碳氮比 C/N ratio
不覆膜 No mulching	CK	8.78±0.05 e	-18.04±0.02 a	1.05±0.02 cd	5.68±0.03 c	8.37±0.11 c
	N₄	8.52±0.01 f	-18.10±0.03 a	1.06±0.02 cd	4.04±0.02 e	8.00±0.17 d
	M₂N₂	13.11±0.02 a	-19.65±0.02 e	1.49±0.04 a	6.94±0.04 b	8.80±0.20 b
覆膜 Mulching	CK	9.16±0.03 d	-18.26±0.04 b	1.03±0.02 d	5.62±0.01 c	8.88±0.15 b
	N₄	10.57±0.03 c	-19.20±0.03 d	1.11±0.02 c	5.13±0.02 d	9.54±0.10 a
	M₂N₂	12.75±0.04 b	-19.12±0.04 c	1.42±0.02 b	14.26±0.05 a	8.96±0.10 b

因子 Factor	自由度 Degree of freedom	δ¹³C F(P)	SOC F(P)	¹³C-SOC F(P)	F_mc F(P)	R_mc F(P)	δ¹⁵N F(P)	TN F(P)	¹⁵N-TN F(P)	F_mn F(P)	R_mn F(P)	SOC/TN F(P)	¹³C-SOC/¹⁵N-TN F(P)
施肥 Fertilization (F)	2	720 (<0.001)	655 (<0.001)	158 (<0.001)	690 (<0.001)	158 (<0.001)	1111 (<0.001)	481.0 (<0.001)	250.0 (<0.001)	1120 (<0.001)	247.9 (<0.001)	31.7 (<0.001)	125 (<0.001)
时间 Time (T)	1	124 (<0.001)	2.96 (0.098)	96.7 (<0.001)	122 (<0.001)	96.7 (<0.001)	112.0 (<0.001)	0.310 (0.583)	83.20 (<0.001)	111.7 (<0.001)	83.01 (<0.001)	0.45 (0.509)	0.01 (0.926)
栽培模式 Cultivation mode (C)	1	0.22 (0.644)	13.6 (0.001)	6.65 (0.016)	0.06 (0.812)	6.65 (0.016)	58.46 (<0.001)	1.005 (0.326)	33.77 (<0.001)	57.72 (<0.001)	33.55 (<0.001)	10.8 (0.003)	10.5 (0.003)
施肥×时间 F×T	2	126 (<0.001)	23.1 (<0.001)	129 (<0.001)	135 (<0.001)	129 (<0.001)	60.02 (<0.001)	15.34 (<0.001)	54.64 (<0.001)	60.93 (<0.001)	54.19 (<0.001)	9.95 (0.001)	23.9 (<0.001)
施肥×栽培模式 F×C	2	24.5 (<0.001)	30.8 (<0.001)	25.4 (<0.001)	29.7 (<0.001)	25.4 (<0.001)	22.81 (<0.001)	4.051 (0.030)	20.02 (<0.001)	22.62 (<0.001)	20.16 (<0.001)	19.1 (<0.001)	1.10 (0.348)
栽培模式×时间 C×T	1	3.51 (0.073)	1.18 (0.289)	1.52 (0.230)	5.34 (0.0300)	1.52 (0.230)	7.162 (0.013)	60.19 (<0.001)	10.07 (0.004)	7.792 (0.010)	10.05 (0.004)	39.1 (<0.001)	16.6 (<0.001)
施肥×栽培模式×时间 F×C×T	2	5.10 (0.014)	4.50 (0.022)	3.99 (0.032)	3.89 (0.034)	3.98 (0.032)	8.208 (0.002)	12.71 (<0.001)	3.823 (0.036)	8.052 (0.002)	3.878 (0.035)	7.68 (0.003)	3.97 (0.032)

栽培模式 Cultivation mode	施肥处理 Fertilization treatment	秸秆碳的贡献率 Contribution percentage of straw carbon to total soil organic carbon (%)		秸秆氮的贡献率 Contribution percentage of straw nitrogen to total nitrogen (%)
栽培模式 Cultivation mode	施肥处理 Fertilization treatment	30 d	150 d	30 d	150 d
不覆膜 No mulching	CK	16.91±0.28 A*	13.91±0.07 a	5.27±0.06 B*	4.70±0.08 a
	N₄	13.90±0.13 B	14.34±0.16 a	3.47±0.12 D	3.38±0.09 d
	M₂N₂	10.13±0.19 D	9.95±0.04 d	3.12±0.01 E	3.03±0.04 e
覆膜 Mulching	CK	16.44±0.33 A*	12.27±0.34 b	5.53±0.09 A*	4.43±0.01 b
	N₄	14.43±0.29 B	14.32±0.18 a	4.03±0.07 C	3.86±0.00 c
	M₂N₂	10.88±0.26 C	10.96±0.14 c	3.30±0.03 DE	3.28±0.09 d

栽培模式 Cultivation mode	施肥处理 Fertilization treatment	秸秆碳的残留率 Residual percentage of straw carbon (%)		秸秆氮的残留率 Residual percentage of straw nitrogen (%)
栽培模式 Cultivation mode	施肥处理 Fertilization treatment	30 d	150 d	30 d	150 d
不覆膜 No mulching	CK	45.35±1.32 A*	35.82±0.52 c	12.24±0.20 A*	10.13±0.23 a
	N₄	37.21±0.30 C	37.84±0.65 b	9.09±0.27 B*	7.87±0.24 e
	M₂N₂	31.52±0.39 D	31.45±0.60 e	8.48±0.05 C	8.50±0.16 d
覆膜 Mulching	CK	44.58±0.79 A*	31.43±0.58 e	11.93±0.26 A*	9.92±0.18 ab
	N₄	40.15±1.11 B	40.96±0.14 a	9.53±0.07 B	9.58±0.15 bc
	M₂N₂	33.34±0.96 D	34.12±0.58 d	9.06±0.25 B	9.41±0.02 c

Effects of Plastic Film Mulching and Fertilization on the Sequestration of Carbon and Nitrogen from Straw in Soil

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