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首页> 外文期刊>Environmental Science and Pollution Research >Are soils beneath coniferous tree stands more acidic than soils beneath deciduous tree stands?
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Are soils beneath coniferous tree stands more acidic than soils beneath deciduous tree stands?

机译：针叶树下面的土壤是否比落叶树下面的土壤更酸性？

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In 2008, the Mulberry River, a National Wild and Scenic River, was listed as impaired due to low pH (below pH6.0). Over the last 50years, the volume of conifers in the Ozark region has increased 115% since 1978 which may result in the acidification of nearby aquatic ecosystems. The objective of this study was to determine if differences exist in soil and litter chemical properties between deciduous and coniferous tree stands. Aboveground litter (n=200) and soil (n=400) at 0- to 5- and 5- to 15-cm depths were collected at paired deciduous and coniferous stands at 10 locations within the Mulberry River watershed and analyzed for a suite of chemical parameters. There were no differences (P>0.05) in several measures of soil acidity between deciduous and coniferous stands. Litter collected from the coniferous stands was more acidic than deciduous litter (4.4 vs 4.7; P<0.05). Cation exchange capacity, exchangeable Ca and Mg, and water-soluble P and Mg contents differed (P<0.05) by stand and depth. Cation exchange capacity and exchangeable Ca and Mg were greatest in the 0- to 5-cm depth interval of the coniferous stands. Water-soluble P and Mg contents were greatest within the 0- to 5-cm depth interval which did not differ (P>0.05) between stand but were greater than the 5- to 15-cm depth interval. Although limited to the top 15-cm of soil, the similarity in soil acidity between stands suggests that conifer growth may not be a substantial source of acidity to the Mulberry River.
机译：2008年，由于低pH（低于PH6.0），桑树河，全国野生和景区河流被列为受损。在过去的50年中，自1978年以来，欧扎克地区的针叶树体积增加了115％，这可能导致附近水生生态系统的酸化。本研究的目的是确定落叶和针叶树之间的土壤和垃圾化学性质是否存在差异。在成对的落叶和有针叶树和针叶落在桑树流域内的10个地点，在桑树流域内的10个位置收集地上垃圾（n = 200）和5-15cm深度的土壤（n = 400），并分析为套件化学参数。在落叶和针叶酸的含量土壤酸度的几种方法中，没有差异（p> 0.05）。从针叶酸地收集的垃圾比落叶垃圾更酸（4.4 Vs 4.7; P <0.05）。阳离子交换能力，可交换的Ca和Mg，水溶性P和Mg含量不同（P <0.05）通过静止和深度不同。阳离子交换能力和可交换的CA和MG在针叶级的0至5cm深度间隔中最大。水溶性P和Mg含量最大，在0到5cm深度间隔内最大，但在支架之间没有不同（p> 0.05），但大于5至15cm深度间隔。虽然限于15厘米的土壤，但展望之间的土壤酸度的相似性表明，针叶树生长可能不是桑树酸度的实质性来源。

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