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首页> 外文期刊>Soil Biology & Biochemistry >Organic resource quality influences short-term aggregate dynamics and soil organic carbon and nitrogen accumulation.
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Organic resource quality influences short-term aggregate dynamics and soil organic carbon and nitrogen accumulation.

机译：有机资源质量影响短期聚集体动力学和土壤有机碳和氮的积累。

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摘要

Organic C inputs and their rate of stabilization influence C sequestration and nutrient cycling in soils. This study was undertaken to explore the influence of the combined application of different quality organic resources (ORs) with N fertilizers on the link between aggregate dynamics and soil organic C (SOC) and soil N. A mesocosm experiment was conducted in Embu, central Kenya where 4 Mg C ha-1 of Tithonia diversifolia (high quality), Calliandra calothyrsus (intermediate quality) and Zea mays (maize; low quality) were applied to soil compared to a no-input control. Each treatment was fertilized with 120 kg N ha-1 as urea [(NH2)2CO] or not fertilized. The soils used in the mesocosms were obtained from a three-year old-field experiment in which the same treatments as in the mesocosm were applied annually. No crops were grown in both the mesocosms and the thee-year field experiment. Soil samples were collected at zero, two, five and eight months after installation of the mesocosms and separated into four aggregate size fractions by wet sieving. Macroaggregates were further fractionated to isolate the microaggregates-within-macroaggregates; all soils and fractions were analyzed for SOC and N. The addition of ORs increased soil aggregation and whole SOC and soil N compared to the control and sole N fertilizer treatments. There were no differences among different OR qualities for whole SOC or soil N, but maize alone resulted in greater mean weight diameter (MWD), macroaggregate SOC and N than sole added Calliandra. The addition of N fertilizer only influenced SOC and soil N dynamics in combination with maize where SOC, soil N and aggregation were lower with the addition of N fertilizer, indicating an increased decomposition and loss of SOC and soil N due to a faster aggregate turnover after addition of N fertilizer. In conclusion, compared to high quality ORs, low quality ORs result in greater aggregate stability and a short-term accumulation of macroaggregate SOC and N. However, the addition of N fertilizers negates these effects of low quality ORs.
机译：有机碳输入量及其稳定速率会影响土壤中的碳固存和养分循环。这项研究旨在探讨不同质量有机资源（OR）与氮肥的联合施用对骨料动力学与土壤有机碳（SOC）和土壤N之间联系的影响。在肯尼亚中部的恩布市进行了中观试验其中有4毫克的高品质蒂索尼亚硫（Tithonia diversifolia），中等质量的卡里德拉（Calliandra calothyrsus）和大麦（Zea mays）Cha -1 。与无输入控件相比，将i>（玉米;低质量）应用于土壤。每种处理均以120 kg N ha -1 作为尿素[（NH 2 ） 2 CO]施肥或不施肥。中膜所用的土壤是从一项为期三年的老田实验中获得的，该实验每年都进行与中膜相同的处理。在中观世界和当年的田间试验中都没有农作物的生长。在安装中观世界后的零，二，五和八个月时收集土壤样品，并通过湿筛将其分成四个聚集体大小部分。进一步将大骨料分级分离以分离微骨料-大骨料。分析所有土壤和各部分的SOC和N。与对照和单独施氮处理相比，添加ORs会增加土壤团聚，整个SOC和土壤N。整个SOC或土壤N的不同OR品质之间没有差异，但是玉米单独施用后的平均体重直径（MWD），大骨料SOC和N大于单独添加的Calliandra 。与玉米一起施用时，氮肥的施用仅影响SOC和土壤氮的动态，而玉米施用氮肥后其SOC，土壤氮和团聚的含量较低，这表明SOC和土壤氮的分解和损失增加是由于施用后总更新更快除氮肥外。总之，与高质量的OR相比，低质量的OR会导致更大的聚集体稳定性和短期聚集的SOC和N的短期积累。但是，添加N肥料会抵消低质量OR的这些影响。

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