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| Effects of returning patterns of straw to field on soil organic carbon and soil humus composition in rice-wheat double cropping systems |
| Received:October 27, 2016 |
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| KeyWord:straw returning;patterns;soil organic carbon;humus acid(HE);fulvic acid(FA);humilic acid(HA) |
| Author Name | Affiliation | E-mail | | GUO Rui-hua | Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences/Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Nanjing 210014, China
Department of Agriculture Agricultural Environment Key Laboratory of the Middle and Lower Reaches of the Yangtze River Plain, Nanjing 210014, China | | | JIN Hong-mei | Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences/Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Nanjing 210014, China
Department of Agriculture Agricultural Environment Key Laboratory of the Middle and Lower Reaches of the Yangtze River Plain, Nanjing 210014, China | hmjin@jaas.ac.cn | | CHANG Zhi-zhou | Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences/Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Nanjing 210014, China
Department of Agriculture Agricultural Environment Key Laboratory of the Middle and Lower Reaches of the Yangtze River Plain, Nanjing 210014, China | | | WANG Hai-hou | Taihu Research Institute of Agricultural Sciences, Suzhou 215155, China | | | SUN Xiao-xiang | Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences/Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Nanjing 210014, China
Department of Agriculture Agricultural Environment Key Laboratory of the Middle and Lower Reaches of the Yangtze River Plain, Nanjing 210014, China
Yancheng Teachers University, Yancheng 224007, China | | | SHEN Ming-xing | Taihu Research Institute of Agricultural Sciences, Suzhou 215155, China | | | LU Chang-ying | Taihu Research Institute of Agricultural Sciences, Suzhou 215155, China | |
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| Abstract: |
| A 9-years field experiment was conducted in Suzhou, Jiangsu Province of China, to study the effects of returning patterns of straw to field on soil organic carbon(SOC) and humus composition in the Taihu Lake Region, a typical rice-wheat rotation region. Four returning patterns were operated, i.e., only wheat straw returning to field(W), only rice straw returning to field(R), both rice and wheat straw returning to field(RW) and no straw returning to field(CK). Soil samples from 0~10 cm and 10~20 cm soil layers were collected to analyze contents of SOC, total nitrogen(TN), humus acid(HE), fulvic acid(FA) and humilic acid(HA). The results indicated that returning straw could significantly(P<0.05) increase SOC contents in 0~10 cm soil layer, compared with that of CK, while no significant effects were found on TN contents. The contents of SOC and TN at 0~10 cm and 10~20 cm soil layers showed the orders of W > RW > R > CK and W > CK > RW > R, respectively. However, no significant differences of SOC and TN contents were found between the three straw returning patterns at the two soil layers. Compared with CK, HE, FA and HA were lower at 0~10 cm soil layer of straw returning treatments; whereas they were higher than that in CK at 10~20 cm soil layer. The contents of HE, FA and HA were the highest in soils from W treatment, while those were highest in soils from RW treatment. The PQ value(HA/HE) in W treatment was the highest at 0~10 cm soil layer, while the lowest at 10~20 cm soil layer. The results from this study showed that only wheat straw returning to field was the best pattern to improve SOC content and the soil humus quality at 0~10 cm soil layer, compared with other straw returning patterns. |
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