不同培肥方式对沙质土地区残次林地土壤团聚体组成及稳定性的影响

doi:10.13866/j.azr.2021.04.08

Abstract

Abstract:

To evaluate the stability of soil aggregates in cultivated land improvements in sandy soil areas, an experimental field was set up in the remnant forest land improvement project area of Jingbian County, Yulin, northern Shaanxi, China. The orthogonal experiment scheme [L9(3⁴)] was used to analyze the effects of different fertilizer types and application rates on soil aggregates. The results showed that compared to non-fertilized farmland soil, the combined application of N fertilizer and organic fertilizer can increase the content of water-stable macro-aggregates. Among them, the content of water-stable macro-aggregates larger than 2 mm was relatively higher when applying the T7 treatment (421.34 kg·hm^-2 urea, no P fertilizer, 125 kg·hm^-2 potassium chloride, and 7.5 t·hm^-2 organic fertilizer) than T1 (no N, P, or K fertilizer, and organic fertilizer), T2 (no N fertilizer, 333.33 kg·hm^-2 superphosphate, 62 kg·hm^-2 potassium chloride, 7.5 t·hm^-2 organic fertilizer), and T3 (no N fertilizer, 675 kg·hm^-2 superphosphate, 125 kg·hm^-2 potassium chloride, 15 t·hm^-2 organic fertilizer). The contents of macro-aggregates over 2 mm were 470.15%, 360.24% and 210.57%, respectively. The quantity distributions when the cumulative content of soil aggregates were 10%, 30%, 60% were D₁₀, D₃₀, D₆₀, respectively. The mean weight diameter, geometric mean diameter, and the soil structure coefficient all had a significant influence, with water-stable large aggregates >2 mm and 0.25-2 mm having obvious promoting effects. The soil structure coefficient (Kctp) of T3, T4 (198.28 kg·hm ^-2 urea, no P fertilizer, 62 kg·hm^-2 potassium chloride, and 15 t·hm^-2 organic fertilizer), T5 (198.28 kg·hm^-2 urea, 333.33 kg·hm^-2 super phosphate, 125 kg·hm^-2 potassium chloride, no organic fertilizer), T6 (198.28 kg·hm^-2 urea, 675 kg·hm^-2 superphosphate, no K fertilizer, 7.5 t·hm^-2 organic fertilizer), T7 and T8 (421.34 kg·hm^-2 urea, 333.33 kg·hm^-2 superphosphate, no K fertilizer, and 15 t·hm^-2 organic fertilizer) were between 1.5 and 0.67, with a good soil structure. In summary, the combined application of N fertilizer and organic fertilizer, especially with the urea application rate of 421.34 kg·hm^-2 (basic application 60%, topdressing 40%), the potassium chloride application rate of 125 kg·hm^-2, and the organic fertilizer application rate of 7.5 t·hm^-2 can improve newly added forest land. The structure of arable soil aggregates enhances the resistance of soil aggregates to water erosion.

Key words: defective forest land, water-stable aggregates, fertilizer, organic fertilizer, soil structure

ZHANG Lu,MENG Tingting,HU Ya,WEI Jing. Effects on soil aggregate composition and stability under various fertilization regimes of defective forest land in a sandy soil area[J].Arid Zone Research, 2021, 38(4): 973-979.

Figures/Tables 7

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Tab. 1

Fig. 2

Tab. 2

Tab. 3

Fig. 3

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References 23

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试验设计	N肥	P肥	K肥	有机肥	试验设计	N肥	P肥	K肥	有机肥
T1	N1	P1	K1	D1	T6	N2	P3	K1	D2
T2	N1	P2	K2	D2	T7	N3	P1	K3	D2
T3	N1	P3	K3	D3	T8	N3	P2	K1	D3
T4	N2	P1	K2	D3	T9	N3	P3	K2	D1
T5	N2	P2	K3	D1

试验设计	大团聚体		微团聚体
试验设计	>2 mm	0.25~2 mm	0.053~0.25 mm	<0.053 mm
T1	6.7±1.94d	21.4±3.35b	48.7±5.31ab	23.2±2.16a
T2	8.3±3.40d	20.3±3.03b	51.2±3.40a	20.2±4.49ab
T3	12.3±3.75d	33.1±4.84a	41.7±4.44bc	12.9±3.24cd
T4	23.5±3.21b	31.4±1.53a	34.9±3.48cd	10.2±2.14cd
T5	14.6±3.59cd	29.2±5.78ab	46.1±2.96ab	10.1±2.59cd
T6	23.5±3.92b	31.9±4.37a	36.2±2.83c	8.4±1.03d
T7	38.2±3.38a	24.6±3.58ab	27.4±2.77d	9.8±2.57cd
T8	20.9±4.94bc	26.6±4.38ab	42.2±2.89bc	10.3±2.86cd
T9	9.6±2.00d	24.3±2.73ab	50.7±4.30a	15.4±3.56bc

试验设计	拟合方程	R²	D₁₀/mm	D₃₀/mm	D₃₀/mm
T1	y=18.811lnx+85.598	0.9098	0.0180	0.0520	0.2565
T2	y=19.155lnx+84.326	0.8962	0.0206	0.0587	0.2808
T3	y=20.163lnx+81.701	0.9213	0.0286	0.0770	0.3409
T4	y=18.077lnx+65.8	0.9869	0.0456	0.1380	0.7255
T5	y=20.362lnx+75.187	0.9555	0.0407	0.1087	0.4743
T6	y=18.577lnx+65.705	0.9855	0.0499	0.1463	0.7356
T7	y=14.194lnx+53.466	0.9868	0.0468	0.1914	1.5846
T8	y=18.609lnx+69.832	0.9547	0.0401	0.1176	0.5896
T9	y=20.344lnx+76.321	0.9776	0.0384	0.1026	0.4483

Effects on soil aggregate composition and stability under various fertilization regimes of defective forest land in a sandy soil area

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试验设计	N肥	P肥	K肥	有机肥	试验设计	N肥	P肥	K肥	有机肥
T1	N1	P1	K1	D1	T6	N2	P3	K1	D2
T2	N1	P2	K2	D2	T7	N3	P1	K3	D2
T3	N1	P3	K3	D3	T8	N3	P2	K1	D3
T4	N2	P1	K2	D3	T9	N3	P3	K2	D1
T5	N2	P2	K3	D1

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试验设计	N肥	P肥	K肥	有机肥	试验设计	N肥	P肥	K肥	有机肥
T1	N1	P1	K1	D1	T6	N2	P3	K1	D2
T2	N1	P2	K2	D2	T7	N3	P1	K3	D2
T3	N1	P3	K3	D3	T8	N3	P2	K1	D3
T4	N2	P1	K2	D3	T9	N3	P3	K2	D1
T5	N2	P2	K3	D1

试验设计	N肥	P肥	K肥	有机肥	试验设计	N肥	P肥	K肥	有机肥
T1	N1	P1	K1	D1	T6	N2	P3	K1	D2
T2	N1	P2	K2	D2	T7	N3	P1	K3	D2
T3	N1	P3	K3	D3	T8	N3	P2	K1	D3
T4	N2	P1	K2	D3	T9	N3	P3	K2	D1
T5	N2	P2	K3	D1