Effects of no-tillage systems on soil physical properties and carbon sequestration under long-term wheat-maize double cropping system
Effects of no-tillage systems on soil physical properties and carbon sequestration under long-term wheat-maize double cropping system
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DOI：
10.1016/j.catena.2015.02.010
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发表时间：
2015-05-01
期刊：
影响因子：
6.2
通讯作者：
Zhou, Chenghu
中科院分区：
文献类型：
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作者：
Huang, Manxiang;Liang, Tao;Zhou, Chenghu
以黄河三角洲冬小麦-玉米两熟制为研究对象，研究了9年耕作与施肥对土壤固碳及其他物理性质的综合影响。选择了三种耕作制度：免耕。秸秆覆盖+尿素氮推荐量（NTS）、秸秆还田+有机肥免耕+尿素氮推荐量（NTM）、秸秆还田+常规尿素氮施用量（CT）。每种处理均采用随机区组设计，重复三次。NTS和NTM处理使土壤容重（BD）略有降低，水稳性团聚体（WSA）（>2 mm）比例和水分入渗能力显著增加。NTS和NTM处理对0-20 cm土层水稳性大团聚体（>0.25 mm）的比例、团聚体的重量平均直径（MWD）和几何平均直径（GMD）无明显影响。各处理间0-60 cm土壤有机碳储量差异不显著。NTS和NTM的团聚体相关SOC浓度和储量（0-5 cm）均显著高于CT，而CT导致20-60 cm土层中的OC积累高于NTS和10-20 cm土层中的OC积累高于NTM。CT处理下，中团聚体（2-0.25 mm）及其结合的有机碳库在整个土壤剖面中所占比例最高。NT系统对所研究的土壤物理性质具有积极的影响，并增加了土壤表层的碳含量。然而，CT系统与小麦-玉米两熟制相结合，改善了土壤剖面（0-60 cm）中的土壤团聚体，并且与NT系统相比，还保持了更高比例的SOC在底土中。(C)2015 Elsevier B. V.版权所有。
A thorough assessment of changes in soil quality associated with soil management practices is vital for the selection and establishment of sustainable agricultural management The winter wheat (Triticurn aestivum L)-maize (Zea mays L) double cropping system was used to study the integrated effects of a 9-year-old tillage coupled with fertilization on soil carbon sequestration and other physical properties in the Yellow River Delta (YRD). Three tillage systems were selected: no-tillage with. straw cover plus recommended urea nitrogen rate (NTS), no-tillage with straw removed and manure applied plus recommended urea nitrogen rate (NTM), and conventional tillage with straw removed plus conventional urea nitrogen application rate (CT). There were three replicates of each treatment organized in a randomized block design. NTS and NTM treatments were found to result in a slightly decrease in the soil bulk density (BD), and significantly increased the proportion of water stable aggregates (WSA) (>2 mm), as well as the water infiltration capacity. The proportion of water stable macroaggregates (>0.25 mm), the mean weight diameter (MWD) and the geometric mean diameter (GMD) of aggregates in the 0-20 cm layer were unchanged by NTS and NTM. The total soil organic carbon (SOC) stock at a depth of 0-60 cm was not significantly different among the treatments. Both aggregate-associated SOC concentration and stocks (0-5 cm) were significantly greater for NTS and NTM compared with CT, while CT led to a greater OC accumulation in the 20-60 cm soil layer compared with NTS and in the 10-20 cm compared with NTM. The mesoaggregate fraction (2-0.25 mm) and its associated OC pool accounted for the highest percentages in the whole soil profile under the CT treatment The NT system was found to have a positive effect on the investigated soil physical properties and increase soil carbon content in the soil surface layer. The CT system in conjunction with the wheat-maize double cropping system, however, improved soil aggregation in the soil profile (0-60 cm) and also maintained a higher fraction of SOC in the subsoil compared with the NT systems. (C) 2015 Elsevier B.V. All rights reserved.