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首页> 美国卫生研究院文献>Scientific Reports >Effects of sedimentation on soil physical and chemical properties and vegetation characteristics in sand dunes at the Southern Dongting Lake region China
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Effects of sedimentation on soil physical and chemical properties and vegetation characteristics in sand dunes at the Southern Dongting Lake region China

机译：沉积对洞庭湖南部地区沙丘土壤理化性质及植被特征的影响

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摘要

Sedimentation is recognized as a major factor determining the ecosystem processes of lake beaches; however, the underlying mechanisms, especially in freshwater sand dunes, have been insufficiently studied. To this end, nine belt transects from nine freshwater sand dunes, classified into low (<23.7 m), medium (25.4–26.0 m), and high-elevation groups (>28.1 m) based on their elevations in 1972, were sampled to investigate differences in sedimentation rate and soil and vegetation characteristics in Southern Dongting Lake, China. Sedimentation rate, soil sand content, and soil pH increased, whereas soil clay, fine silt, moisture (MC), organic matter (OM), total N, and total K content, in addition to the growth and biodiversity of sand dune plants generally decreased with decreasing belt transect elevation. Regression analyses revealed that the negative effects of sedimentation on the ecosystem functions of sand dunes could be attributed to higher fine sand content in deposited sediments and stronger inhibition of plant growth. These results are consistent with previous studies performed in coastal sand dunes, which highlights the importance of sedimentation in determining ecological processes.
机译：泥沙被认为是决定湖滩生态系统过程的主要因素。但是，尚未充分研究其潜在机理，尤其是在淡水沙丘中。为此，根据1972年的海拔，对来自九个淡水沙丘的九个带状断面进行了采样，根据其海拔将其分为低（<23.7 m），中（25.4–26.0 m）和高海拔组（> 28.1 m）。调查了中国南部洞庭湖的沉积速率和土壤及植被特征的差异。除沙丘植物的生长和生物多样性外，沉积速率，土壤含沙量和pH值均增加，而土壤黏土，细粉砂，水分（MC），有机质（OM），总氮和总钾含量增加随带状剖面高程的减小而减小。回归分析表明，沉积物对沙丘生态系统功能的负面影响可能归因于沉积物中较高的细沙含量和对植物生长的更强抑制作用。这些结果与先前在沿海沙丘上进行的研究一致，这突出了沉积在确定生态过程中的重要性。

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