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4 不同秸秆还田模式对0~40 cm土层中各粒级团聚体关联有机碳含量的影响

Table 4 Effect of straw incorporation on aggregate-associated soil organic carbon content in 0-40 cm layers

土层深度 Soil depth	处理 Treatment	不同粒级团聚体有机碳含量 Aggregate-associated SOC (g kg^-1)
土层深度 Soil depth	处理 Treatment	>5 mm	5-2 mm	2-1 mm	1.0-0.5 mm	0.50-0.25 mm	<0.25 mm
0-10 cm	NS	6.30 a	5.92 b	5.88 b	5.55 a	5.53 a	5.24 a
	SS	6.76 b	6.54 ab	6.24 ab	5.89 a	5.92 a	5.43 a
	WS	6.56 ab	6.42 ab	5.92 ab	5.58 a	5.61 a	5.25 a
	DS	6.87 a	6.71 a	6.41 a	6.03 a	5.93 a	5.43 a
10-20 cm	NS	7.05 a	6.19 b	6.10 b	5.93 a	5.73 a	5.43 a
	SS	7.11 a	6.59 ab	6.44 ab	6.13 a	5.96 a	5.67 a
	WS	7.42 ab	6.63 ab	6.51 ab	6.29 a	5.96 a	5.64 a
	DS	7.77 a	7.02 a	6.92 a	6.37 a	5.95 a	5.85 a
20-30 cm	NS	4.92 c	3.75 a	3.72 c	3.57 c	3.34 b	3.18 a
	SS	5.36 b	4.64 a	4.02 bc	3.79 bc	3.58 b	3.20 a
	WS	5.40 b	4.71 a	4.48 ab	4.03 b	3.94 ab	4.09 a
	DS	5.93 a	4.01 a	4.94 a	4.74 a	4.53 a	4.05 a
30-40 cm	NS	—	2.50 a	2.30 b	2.18 b	2.07 a	1.96 a
	SS	—	2.66 a	2.61 ab	2.27 b	2.12 a	1.87 a
	WS	—	2.74 a	2.80 ab	2.71 a	2.57 a	2.51 a
	DS	—	2.87 a	2.93 a	2.81 a	2.38 a	2.35 a