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首页> 外文期刊>Plant and Soil >Effects of forest management intensity on carbon and nitrogen content in different soil size fractions of a North Florida Spodosol.
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Effects of forest management intensity on carbon and nitrogen content in different soil size fractions of a North Florida Spodosol.

机译：森林经营强度对北佛罗里达坡缕藻不同土壤组分中碳和氮含量的影响。

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Pine plantations of the southeastern USA are regional carbon (C) sinks. In spite of large increases in woody biomass due to advanced growing systems, studies have shown little or even negative effects on the C content of the extremely sandy soils of this region. Hence, it is important to understand the mechanisms that determine the impact of intensive forest management on soil organic carbon (SOC) sequestration. This study was conducted to examine the C profile in a 4-year-old loblolly pine (Pinus taeda L.) plantation managed under two levels of management intensity (chemical understorey control and fertilizer inputs). Soil organic C and nitrogen (N) pools were evaluated using two size fractionation methods, dry and wet sieving (2000-250 micro m, 250-150 micro m, 150-53 micro m and <53 micro m). Dry sieving was preferred over wet sieving for soil size fractionation, as it preserved more structure and water-soluble SOC components such as esters and amides and did not affect the N distribution. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) spectra were used to examine the chemical composition of the size fractions, which showed the presence of recently added organic matter in the largest sand fraction, as well as more decomposed organic matter in the <53 micro m fraction. Intensive forest management reduced SOC in all three 2000-53 micro m fractions, most likely due to reduced root input of understorey plants that were controlled using herbicides. The 2000-250 micro m fractions contained nearly half of the total SOC and showed a 23% decrease in C content due to the intensive management regime. Results from this study indicated the significance and responsiveness of sand size SOC fractions in Florida Spodosols. Results also showed that reductions in SOC due to intensive management occurred after four years and highlighted the need to understand the long-term impacts and the mechanisms responsible.
机译：美国东南部的松树人工林是区域碳（C）汇。尽管先进的生长系统使木质生物量大量增加，但研究表明，该地区极沙质土壤的碳含量几乎没有甚至产生负面影响。因此，重要的是要了解决定森林集约经营对土壤有机碳（SOC）固存影响的机制。进行了这项研究，以检查在4个管理强度水平下（化学层下控制和肥料输入）管理的4年生火炬松（Pinus taeda L.）人工林的碳剖面。使用两种大小分级方法（干筛和湿筛（2000-250微米，250-150微米，150-53微米和<53微米））评估土壤有机碳和氮（N）库。对于土壤大小分级，干筛优于湿筛，因为它保留了更多的结构和水溶性SOC成分（如酯和酰胺），并且不影响氮的分布。漫反射红外傅里叶变换光谱（DRIFTS）光谱用于检查尺寸级分的化学组成，这表明最近添加的有机物存在于最大的砂级分中，并且在<53微米内分解得更多分数。严格的森林管理可降低所有三个2000-53微米部分的SOC，这很可能是由于使用除草剂控制的下层植物的根部输入减少所致。 2000-250微米级分几乎占总SOC的一半，并且由于采取了严格的管理制度，碳含量降低了23％。这项研究的结果表明，佛罗里达Spodosols中沙粒SOC分数的重要性和响应性。结果还表明，由于强化管理而导致的SOC降低是在四年后发生的，并强调需要了解长期影响和负责的机制。

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