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首页> 外文期刊>Soil & Tillage Research >Carbon and nitrogen stocks in a Brazilian clayey Oxisol: 13-year effects of integrated crop-livestock management systems.
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Carbon and nitrogen stocks in a Brazilian clayey Oxisol: 13-year effects of integrated crop-livestock management systems.

机译：巴西黏性土壤Oxisol中的碳和氮储量：作物-牲畜综合管理系统的13年影响。

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Integrated crop-livestock management systems (ICLS) have been increasingly recommended in Brazilian agroecosystems. However, knowledge of their effect on soil organic carbon (SOC) and total nitrogen (TN) concentrations and stocks is still limited. The study was undertaken to evaluate the effects of ICLS under two tillage and fertilization regimes on SOC and TN concentrations and stocks in the 0-30 cm soil layer, in comparison with continuous crops or pasture. The following soil management systems were studied: continuous pasture; continuous crop; 4 years' crop followed by 4 years' pasture and vice-versa. The adjacent native Cerrado area was used as a control. Under the rotation and continuous crop systems there were two levels of soil tillage (conventional and no-tillage) and fertility (maintenance and corrective fertility). The stock calculations were done using the equivalent soil mass approach. The land use systems had a significant effect on the concentrations of SOC and TN in the soil, but no effect was observed for the soil tillage and fertilizer regimes. For these two latter, some significant discrepancies appeared in the distribution of SOC and TN concentrations in the 0-30 cm layer. Carbon storage was 60.87 Mg ha-1 under Cerrado, and ranged from 52.21 Mg ha-1 under the ICLS rotation to 59.89 Mg ha-1 with continuous cropping. The decrease in SOC stocks was approximately 8.5 and 7.5 Mg ha-1, or 14 and 12%, for continuous pasture and ICLS respectively. No-tillage for 10 years after the conversion of conventional tillage to no-tillage under the continuous crop system, and 13 years of conventional tillage in continuous cropping did not result in significant changes in SOC stocks. The SOC and TN stocks in surface layers, using the equivalent soil mass approach rather than the equivalent depth, stress the differences induced by the calculation method. As soil compaction is the principal feature of variability of stocks determinations, the thickness should be avoid in these types of studies.
机译：在巴西的农业生态系统中，越来越多地建议使用集成的农作物－牲畜管理系统（ICLS）。但是，关于它们对土壤有机碳（SOC）和总氮（TN）浓度及储量的影响的了解仍然有限。与连续作物或牧场相比，本研究旨在评估两种耕作和施肥方式下ICLS对0-30 cm土壤层中SOC和TN浓度及储量的影响。研究了以下土壤管理系统：连续牧场;连作;耕种4年，然后放牧4年，反之亦然。相邻的本地Cerrado地区用作对照。在轮作和连作制度下，土壤耕作（常规耕作和免耕）和肥力（维持性肥力和修正肥力）有两个水平。使用等效土壤质量方法进行种群计算。土地利用系统对土壤中的SOC和TN浓度有显着影响，但对土壤耕作和施肥制度没有影响。对于后两者，0-30 cm层中SOC和TN浓度的分布出现了一些明显的差异。 Cerrado下的碳储量为60.87 Mg ha -1 ，且在ICLS旋转下的储碳量为52.21 Mg ha -1 至59.89 Mg ha -1 连作。连续牧场和ICLS的SOC储量减少分别约为8.5和7.5 Mg ha -1 ，分别为14％和12％。在常规作物制度下，将常规耕作转变为免耕后10年免耕，而连续耕作的13年常规耕作不会导致SOC储量发生重大变化。表层的SOC和TN储量使用等效土壤质量方法而不是等效深度，强调计算方法引起的差异。由于土壤压实是种群确定性变化的主要特征，因此在这类研究中应避免厚度。

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