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首页> 美国卫生研究院文献>PLoS Clinical Trials >Rock Outcrops Redistribute Organic Carbon and Nutrients to Nearby Soil Patches in Three Karst Ecosystems in SW China
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Rock Outcrops Redistribute Organic Carbon and Nutrients to Nearby Soil Patches in Three Karst Ecosystems in SW China

机译：中国西南三大岩溶生态系统中的岩石露头将有机碳和养分重新分配给附近的土壤斑块

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Emergent rock outcrops are common in terrestrial ecosystems. However, little research has been conducted regarding their surface function in redistributing organic carbon and nutrient fluxes to soils nearby. Water that fell on and ran off 10 individual rock outcrops was collected in three 100 × 100 m plots within a rock desertification ecosystem, an anthropogenic forest ecosystem, and a secondary forest ecosystem between June 2013 and June 2014 in Shilin, SW China. The concentrations of total organic carbon (TOC), total nitrogen (N), total phosphorus (P), and potassium (K) in the water samples were determined during three seasons, and the total amounts received by and flowing out from the outcrops were calculated. In all three ecosystems, TOC and N, P, and K were found throughout the year in both the water received by and delivered to nearby soil patches. Their concentrations and amounts were generally greater in forested ecosystems than in the rock desertification ecosystem. When rock outcrops constituted a high percentage (≥ 30%) of the ground surface, the annual export of rock outcrop runoff contributed a large amount of organic carbon and N, P, and K nutrients to soil patches nearby by comparison to the amount soil patches received via atmospheric deposition. These contributions may increase the spatial heterogeneity of soil fertility within patches, as rock outcrops of different sizes, morphologies, and emergence ratios may surround each soil patch.
机译：紧急的岩石露头在陆地生态系统中很常见。但是，关于它们在将有机碳和养分通量重新分配到附近土壤中的表面功能的研究很少。 2013年6月至2014年6月，在中国西南石林，在一个石漠化生态系统，一个人为森林生态系统和一个次生森林生态系统中的三个100×100 m地块中收集了落下并掉下10个岩石露头的水。在三个季节中确定水样中总有机碳（TOC），总氮（N），总磷（P）和钾（K）的浓度，露头接收和流出的总量为计算。在这三个生态系统中，全年都从附近土壤斑块接收和输送的水中发现了TOC和N，P和K。在森林生态系统中，它们的浓度和数量通常比岩石荒漠化生态系统中的浓度和数量更大。当岩石露头占地面的比例很高（≥30％）时，与附近土壤斑块的数量相比，岩石露头径流量的年出口为附近的土壤斑块贡献了大量有机碳和N，P和K养分通过大气沉积得到。这些贡献可能会增加斑块内土壤肥力的空间异质性，因为不同大小，形态和出土率的岩石露头可能围绕每个土壤斑块。

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