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Changes in soil organic carbon fractions in response to different tillage practices under a wheat‐maize double cropping system
Land Degradation & Development ( IF 4.7 ) Pub Date : 2018-04-19 , DOI: 10.1002/ldr.2950
Jian-Fu Xue 1, 2 , Chao Pu 1 , Xin Zhao 1 , Yan-Hua Wei 1 , Yun-Long Zhai 1 , Xiang-Qian Zhang 1 , Rattan Lal 3 , Hai-Lin Zhang 1
Affiliation  

To understand the turnover of soil organic carbon (SOC) and the improvement of soil quality in response to tillage practices, it is important to identify changes in labile SOC fractions, for example, permanganate oxidizable organic carbon (POxC) and particulate organic carbon (POC). Five tillage treatments were initially undertaken in a winter wheat (Triticum aestivum L., mid‐October to early‐June)–summer maize (Zea mays L., mid‐June to early‐October) system in the North China Plain in 2008 with changes being examined in 2012–2013. These treatments included plough tillage with residue removed, plough tillage with residue incorporation, no tillage with residue mulching, subsoiling with residue incorporation, and rotary tillage (tillage with a rotary tiller) with residue incorporation for the winter wheat season; summer maize was only managed with the NTM treatment. The greatest POxC and POC concentrations at the 0–5‐cm depth were observed under RTR and NTM treatments (p < .05), respectively. Both STR and RTR recorded larger POxC and POC concentrations at the 5–10‐cm depth (p < .05). Both POxC and POC concentrations for STR treatment were significantly higher than those under RTR, NTM, and PT0 treatments in the 20–50‐cm soil profile. The POC concentrations in each soil layer of 0–30‐cm showed a significant response to residue amount, temperature, and precipitation; and POxC concentrations did not record similar responses. Therefore, subsoiling with residue incorporation could be a potential tillage practice to manage labile SOC pool in top soil (0–50‐cm) in the North China Plain region.

中文翻译:

玉米-玉米双作制度下不同耕作方式对土壤有机碳组分的影响

为了了解土壤有机碳(SOC)的转换和土壤质量对耕作方式的响应,重要的是确定不稳定的SOC组分的变化,例如高锰酸盐可氧化有机碳(POxC)和颗粒有机碳(POC) )。五个耕作处理在冬小麦最初承诺(小麦L.,十月中旬至6月初)-summer玉米(玉米L.,2008年6月中旬至10月上旬)在华北平原,2012年至2013年研究了这一变化。这些处理包括:除去残茬的耕作,掺入残茬的耕作,不覆盖残茬的耕作,掺入残渣的深层耕作,以及掺入残茬的冬小麦旋耕(用旋耕机耕作);夏季玉米仅采用NTM处理。在RTR和NTM处理下 ,分别在0-5 cm深度观察到最大的POxC和POC浓度(p <.05)。STR和RTR都记录了5-10 cm深度处较大的POxC和POC浓度(p <.05)。在20–50 cm的土壤剖面中,STR处理的POxC和POC浓度均显着高于RTR,NTM和PT0处理的POxC和POC浓度。每个土壤层中0-30 cm的POC浓度显示对残留量,温度和降水的显着响应。和POxC浓度没有记录类似的响应。因此,在华北平原地区表层土壤(0–50-cm)中,不稳定的SOC池可能是潜在的耕作方式,以管理不稳定的SOC池。
更新日期:2018-04-19
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