秸秆还田量对川中丘陵冬小麦-夏玉米轮作体系土壤物理特性的影响

doi:10.3864/j.issn.0578-1752.2023.07.012

Abstract

Abstract:

【Objective】 The aim of this study was to ascertain the effects of straw returning quantity on the soil physical characteristics and to establish a recycling model for planting by-products, so as to provide a scientific basis for the utilization of straw resources in the central hilly area of Sichuan basin.【Method】 Herein, based on long-term field trials (2006-present) using a combination of in situ monitoring and computed tomography microscanning (CT), the effects of different amounts of straw returned to the field (0 straw returned (RMW₀), 30% straw returned (RMW₃₀), 50% straw returned (RMW₅₀), and 100% straw returned (RMW₁₀₀)) on the physical characteristics at the cultivated soil layer of the winter wheat-summer maize rotation system were examined.【Result】 (1) Straw returned to the field could significantly improve soil permeability, water holding capacity and hydraulic conductivity, and the improving effect increased significantly with the amount of straw returned to the field. Compared with RMW₀, soil bulk density under RMW₃₀, RMW₅₀, and RMW₁₀₀ reduced significantly by 15.2%, 11.7%, and 17.9%, respectively; whereas, soil porosity under these treatments were significantly increased by 18.4%, 13.7%, and 21.3%, respectively. In addition, the saturated hydraulic conductivity of RMW₁₀₀ treatment was as high as 1.62 mm·min^-1, and the soil hydraulic conductivity was superior to other treatments. (2) Straw returning promoted the development of existing pores into larger ones and significantly improved pore uniformity and connectivity. The RMW₁₀₀ and RMW₅₀ treatments improved the macropore composition of the soil better than that under the RMW₃₀ and RMW₀ treatments. The average pore diameter of the RMW₁₀₀ treatment tended to be larger and inter-pore connectivity was optimal. The homogeneity of the pores under the RMW₅₀ treatment was significantly improved and the pore size distribution was more appropriate than that under other treatments. (3) Compared with RMW₀ treatment, the number of >2 mm agglomerates increased significantly and the number of 0.25-2 mm agglomerates decreased significantly after straw returned to the field, which was beneficial to the formation of large soil water-stable agglomerates and promoted the transformation of medium to large agglomerates. Both RMW₅₀ and RMW₁₀₀ treatments improved significantly better than that under RMW30 treatment. (4) Principal components analysis showed soil bulk density, water-stable aggregate with diameter larger than 0.25 mm and large pore were the main indicators of the physical characteristics of cultivated soils in calcareous purple soils. The first and second principal components explained 57.8% and 23.6% of the physical properties of the soil, respectively. The physical characteristics under RMW₅₀ and RMW₁₀₀ treatments were close to each other, and showed significant divergence from the RMW₀ and RMW₃₀ treatments on the PC1 and PC2 axes. 【Conclusion】 On the basis of no significant difference of crop yield in the central hilly area of Sichuan basin, there were differences in the effects of different straw returning quantities on the physical properties of cultivated soil layer, with no significant differences between 50% and 100% straw returning effects, but significantly better than that of 30% and 0 of straw incorporation. The specific straw application rate should be selected according to the local conditions.

Key words: straw returning, purple soil, winter wheat-summer maize rotation system, soil aggregate, soil pore characteristics

MA ShengLan, KUANG FuHong, LIN HongYu, CUI JunFang, TANG JiaLiang, ZHU Bo, PU QuanBo. Effects of Straw Incorporation Quantity on Soil Physical Characteristics of Winter Wheat-Summer Maize Rotation System in the Central Hilly Area of Sichuan Basin[J].Scientia Agricultura Sinica, 2023, 56(7): 1344-1358.

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	冬小麦季Winter wheat				夏玉米季 Summer maize
	RMW₀	RMW₃₀	RMW₅₀	RMW₁₀₀	RMW₀	RMW₃₀	RMW₅₀	RMW₁₀₀
作物产量 Crop yield (kg·hm^-2)	3457±164ab	3282±143b	3721±212a	3765±205a	6115±342a	6217±330a	6254±269a	6263±337a
秸秆多年平均产量 Average straw production (kg·hm^-2)	5889±437				6247±272
秸秆还田量 The quantities of straw returning (kg·hm^-2)	0	1874±65	3123±109	6247±272	0	1767±131	2944±219	5889±437

	粒径 Size (mm)	RMW₀	RMW₃₀	RMW₅₀	RMW₁₀₀
容重Bulk density (g·cm^-3)		1.45±0.06a	1.23±0.01b	1.28±0.04b	1.19±0.02b
总孔隙度 Total porosity (%)		45.4±2.34b	53.76±0.46a	51.63±1.60a	55.09±0.69a
饱和含水量Saturated water content (w/w, %)		25.77±2.24a	24.00±0.56a	26.31±1.10a	26.05±1.00a
饱和导水率Saturated hydraulic conductivity (mm·min^-1)		0.80±0.01b	0.79±0.03b	1.11±0.26ab	1.62±0.37a
土壤颗粒组成 Soil particle composition (%)	0.05-2.0	25.43±4.78ab	22.71±1.62b	26.30±2.11ab	27.64±1.07a
	0.002-0.05	43.40±3.65ab	46.59±3.09a	41.01±3.29b	44.13±2.08ab
	<0.002	20.09±1.01ab	19.90±1.72ab	21.56±1.49a	16.19±1.05b
	洗失量 Wash loss	11.06±0.91ab	10.79±0.64b	11.13±0.46ab	12.03±0.48a
水稳性团聚体含量 Water stable agglomerates content (%)	>2	18.14±4.36b	26.09±8.53a	27.99±5.02a	27.21±0.87a
	0.25-2	50.66±6.33a	38.59±7.80b	43.47±4.6ab	36.33±2.52b
	0.053-0.25	15.38±2.44a	17.40±1.48a	14.74±0.95a	17.40±1.48a
	<0.053	15.82±3.48ab	18.02b±0.7ab	13.80±0.33b	22.07±1.84a
土壤团聚度 Soil agglomeration (%)		69.79±1.34a	72.33±0.34a	69.40 ±0.78a	65.80±1.65b

处理 Treatment	大孔隙度（>25 μm）Macro porosity (%)	大孔隙占总孔隙度的比例 Macro porosity as a proportion of total porosity (%)	不同孔径孔隙占大孔隙数量比/体积比 Ratio of pores under different sizes to the number/volume ratio of large pores				平均孔喉比 Mean pore-throat ratio	平均喉道截面积 Mean sectional area of throat (μm²)	形状因子 Shape factor-as circle	平均配位数 Mean coordination number of pore
处理 Treatment	大孔隙度（>25 μm）Macro porosity (%)		25-100 (μm)	100-500 (μm)	500-1000 (μm)	>1000 (μm)	平均孔喉比 Mean pore-throat ratio	平均喉道截面积 Mean sectional area of throat (μm²)	形状因子 Shape factor-as circle	平均配位数 Mean coordination number of pore
RMW₀	13	28.6	51.0/0	41.9/7.0	4.6/6.2	2.6/86.8	0.15	0.22	0.81	0.68
RMW₃₀	8	14.8	41.9/0	49.8/13.5	5.5/12.1	2.8/74.4	0.12	0.17	0.80	0.69
RMW₅₀	7	13.5	33.3/0	43.3/12.7	12.7/37.5	10.7/49.8	0.34	0.13	0.70	0.53
RMW₁₀₀	17	36.0	41.8/0	39.6/3.2	10.2/5.7	8.4/91.0	0.34	0.25	0.74	0.88

	因子 Factor	共同度 Communality
容重 Bulk density		0.959
孔隙度 Porosity		0.909
土壤饱和含水量 Saturated water content		0.822
土壤饱和导水率 Saturated hydraulic conductivity		0.860
孔隙数量 Porosity quantity	25-100 μm	0.930
	100-500 μm	0.736
	500-1000 μm	0.992
	>1000 μm	0.991
颗粒组成 Soil particle composition	砂粒Sand	0.853
	粉粒Silt	0.929
	黏粒Clay	0.836
水稳性团聚体 Water-stable agglomerates	大团聚体Macro aggregate	0.877
	中团聚体Medium aggregate	0.958
	黏粉粒团聚体 Clay powder aggregate	0.935
	微团聚体Micro aggregate	0.850

Effects of Straw Incorporation Quantity on Soil Physical Characteristics of Winter Wheat-Summer Maize Rotation System in the Central Hilly Area of Sichuan Basin

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