周年秸秆还田对农田土壤固碳及冬小麦-夏玉米产量的影响

李昊昱,孟兆良,庞党伟,陈金,侯永坤,崔海兴,金敏,王振林,李勇

Effect of annual straw return model on soil carbon sequestration and crop yields in winter wheat-summer maize rotation farmland

Hao-Yu LI,Zhao-Liang MENG,Dang-Wei PANG,Jin CHEN,Yong-Kun HOU,Hai-Xing CUI,Min JIN,Zhen-Lin WANG,Yong LI

表3 不同秸秆还田模式对0~40 cm土壤容重、团聚体分布及稳定性的影响

Table 3 Effect of different straw incorporation model on soil bulk density, soil aggregate proportion, and mean weight diameter in 0-40 cm layers

处理 Treatment	容重 SBD (g cm^-3)	大团聚体质量比例 R_0.25(%)	各粒级团聚体质量比例 Soil aggregate proportion (%)						平均重量直径 MWD (mm)
处理 Treatment	容重 SBD (g cm^-3)	大团聚体质量比例 R_0.25(%)	>5 mm	5-2 mm	2-1 mm	1.0-0.5 mm	0.05-0.25 mm	<0.25 mm	平均重量直径 MWD (mm)
0-10 cm
NS	1.41 a	73.50 b	3.99 a	15.43 a	13.63 a	20.54 a	19.91 a	26.50 a	1.24 b
SS	1.32 b	81.95 a	8.71 a	16.39 a	15.32 a	25.43 a	16.10 a	18.05 b	1.54 a
WS	1.35 ab	82.21 a	6.37 a	17.41 a	13.10 a	25.95 a	19.37 a	17.79 b	1.44 ab
DS	1.30 b	84.55 a	8.97 a	17.19 a	13.92 a	25.88 a	18.59 a	15.45 b	1.56 a
10-20 cm
NS	1.49 a	74.82 b	3.13 a	17.22 a	15.13 a	23.69 a	15.66 a	25.18 a	1.29 b
SS	1.42 ab	80.29 b	3.32 a	16.52 a	17.07 a	28.32 a	15.06 a	19.71 a	1.32 b
WS	1.47 ab	89.45 a	5.82 a	18.13 a	21.13 a	28.82 a	15.56 a	10.55 b	1.54 ab
DS	1.39 b	88.49 a	8.44 a	24.63 a	20.30 a	25.19 a	9.92 a	11.51 b	1.84 a
20-30 cm
NS	1.51 a	70.83 c	3.25 a	9.96 c	11.73 b	23.11 a	22.80 a	29.18 a	1.02 b
SS	1.46 ab	75.14 bc	3.42 a	11.62 bc	17.62 ab	22.58 a	19.90 a	24.87 ab	1.15 ab
WS	1.50 ab	80.40 ab	1.56 a	17.59 ab	12.77 ab	29.82 a	18.66 a	19.60 bc	1.23 ab
DS	1.44 b	84.40 a	2.25 a	20.21 a	20.38 a	26.99 a	14.57 a	15.60 c	1.42 a
30-40 cm
NS	1.51 a	76.84 a	1.03 a	5.69 a	10.80 a	38.60 a	20.73 a	23.16 a	0.84 a
SS	1.46 a	72.64 a	0.32 a	3.29 a	8.49 a	38.49 a	22.05 a	27.36 a	0.70 a
WS	1.51 a	72.42 a	0.63 a	4.83 a	15.21 a	31.47 a	20.28 a	27.58 a	0.81 a
DS	1.46 a	71.31 a	0.24 a	2.70 a	10.05 a	26.12 a	32.21 a	28.69 a	0.65 a