耕作管理对潮土团聚体形成及有机碳累积的长期效应

doi:10.3864/j.issn.0578-1752.2015.23.005

Abstract

Abstract: 【Objective】The long-term effects of various tillage managements on aggregation and organic C accumulation were investigated for promoting Fluvo-aquic soil quality in the North China plain.【Method】In this paper, undisturbed soils were sampled, which lasted for 8 years under conservation tillage at the State Experimental Station of Agro-Ecosystem in Fengqiu. The mass and stability of aggregates, and organic C concentration in bulk soil and aggregates were measured to evaluate the impact of tillage managements.【Result】Compared with conventional tillage, no-tillage and intermittent tillage markedly enhanced the mass proportion of large macro-aggregate in 0-10 cm layers and small macro-aggregate in 10-20 cm layers by 63.4% and 28.1%, respectively. In 0-20 cm layers, the mass proportion of macro-aggregate was increased by 3.0% under straw incorporation compared to that without straw returning. Tillage frequency reduction or straw incorporation improved the stability of aggregates, and the Mean Weight Diameter (MWD) and Geometric Mean Diameter (GMD) of the former in 0-10 cm layers were enhanced by 11.9%-31.6% and 4.1% -13.7%, respectively, while those of the latter in 0-20 cm layers were increased by 3.5% and 4.5%, respectively. Tillage frequency reduction and straw managements increased the organic C concentration of aggregates in 0-10 cm and 0-20 cm layers, respectively. Moreover, tillage methods coupled with straw managements had more significant effects on soil aggregates than single tillage frequency reduction or straw returning. The large and small macro-aggregates made more contribution to the accumulation of organic C in Fluvo-aquic soil, and the relative contribution from large macro-aggregate in 0-10 cm layers and that from small macro-aggregates in 10-20 cm layers could be enhanced by 49.2% and 29.1% respectively, through tillage frequency decrease.【Conclusion】No tillage and intermittent tillage combined with straw management could markedly accelerate soil aggregation. By enhancing the contribution of macro-aggregates to organic C accumulation, C sequestration in Fluvo-aquic soil would be also accelerated under conservation tillage.

Key words: conservation tillage, fluvo-aquic soil, water-stable aggregate, organic C

ZHANG Xian-feng, ZHU An-ning, ZHANG Jia-bao, YANG Wen-liang, YAN Jing-tao. The Long-Term Effect Research of Various Tillage Managements on the Soil Aggregates and Organic Carbon in Fluvo-Aquic Soil[J].Scientia Agricultura Sinica, 2015, 48(23): 4639-4648.

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