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首页> 外文期刊>Physics and chemistry of the earth >Spatial and seasonal distribution of carbon, nitrogen, phosphorus, and sulfur and their ecological stoichiometry in wetland soils along a water and salt gradient in the Yellow River Delta, China
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Spatial and seasonal distribution of carbon, nitrogen, phosphorus, and sulfur and their ecological stoichiometry in wetland soils along a water and salt gradient in the Yellow River Delta, China

机译：沿着黄河三角洲水和盐梯度湿地土壤的空间和季节性分布及其在湿地土壤中的生态学化学计量

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Top soils (0-10 cm) were collected in three sampling belts during four seasons in 2014, including bare land (HN1), Calamagrostis epigeios (HN2), Typha orientalis (HN3), Phragmites australis (HN4), Tamarix chinensis (HN5) and Suaeda salsa (HN6) along a water and salinity gradient in the Yellow River Delta, China. Soil organic carbon (SOC), total nitrogen (TN), total phosphorous (TP), total sulfur (TS) and their ecological stoichiometry were measured to investigate their seasonal and horizontal distribution patterns, as well as their important influencing factors such as electric conductivity (EC) and water content (WC). Our results showed that the contents of SOC and TN exhibited similar changing tendency along the water and salinity gradient. The TP contents followed the order HN5 approximate to HN2 HN3 approximate to HN6 HN4 HN1. TS levels generally increased with increasing salinity from HN1 to HN6. The higher levels of SOC and TP were mostly observed in October and August, respectively, while the seasonal variations in TN were heterogeneous under different plant covers. TS contents were lower in August compared with other sampling periods except for HN4. The mean values of the C/N, C/P and C/S ratios along a water-salinity gradient ranged from 26 to 72, 20 to 74, and 61 to 292, respectively. Generally, higher C/P ratios were observed in sampling sites with plant covers in October expect for HN1, whereas they were lower in January or August. SOC, TN and TP were significantly positively correlated with soil organic matter (SOM), silt, WC and cation exchange capacity (CEC) (p 0.05), whereas TS showed a positive correlation with EC and cations content (p 0.05). Bulk density (BD) had a great influence on C/N ratio, C/P ratio were mainly effected by SOM, EC and silt, while C/S ratio showed a significant negative correlation with BD, EC, K+, Na+, and Mg2+ (p 0.05).
机译：2014年四季，包括赤土（HN1），Calamagrostis Epigeios（HN2），Typhmites澳大利亚（HN4），Tamarix Chinensis（HN4），Typhmites沿着黄河三角洲，苏亚萨萨尔萨（HN6）沿着水和盐度梯度。测量土壤有机碳（SOC），总氮（TN），总磷（TP），总硫（TS）及其生态化学计量，研究其季节性和水平分布图案，以及它们的重要影响因素，如电导率（EC）和含水量（WC）。我们的研究结果表明，SOC和TN的内容沿水和盐度梯度表现出类似的变化趋势。 TP内容遵循HN5的顺序近似到HN2＆GT; HN3近似HN6＆GT; HN4＆ HN1。 TS水平通常随着HN1至HN6的增加而增加。 10月和8月，较高水平的SOC和TP分别观察到，而TN的季节变化在不同的植物覆盖下是异质的。除了HN4之外，8月份的TS含量与其他采样周期相比。 C / N，C / P和C / S比的平均值沿水 - 盐度梯度的范围分别为26至72,20至74和61至292。通常，在10月份的植物覆盖期望HN1期望植物盖的取样位点中观察到较高的C / P比，而他们在1月或8月较低。 SOC，TN和TP与土壤有机物（SOM），淤泥，WC和阳离子交换能力（CEC）显着呈正相关，而TS与EC和阳离子含量呈正相关（P＆GT; 0.05 ）。堆积密度（BD）对C / N比具有很大影响，C / P比主要由SOM，EC和SILT进行，而C / S比率与BD，EC，K +，NA +和MG2 +显着呈负相关性。 （P <0.05）。

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