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Spatiotemporal Distribution Characteristics of Soil Organic Carbon in Newborn Coastal Wetlands of the Yellow River Delta Estuary

机译：黄河三角洲新生滨海湿地土壤有机碳的时空分布特征。

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摘要

The distribution and seasonal variation of soil organic carbon (SOC) in newborn coastal wetland of the Yellow River Delta (YRD) estuary at eastern China were studied based on monitoring data in 2009 at two transects from the bank of the Yellow River to the seaside. The results showed that SOC contents of 0-60cm soil layer in transects ranged from 0.46 to 10.15gkg(-1) and average values of soil profiles ranged from 2.15 to 5.00gkg(-1). The SOC contents tended to increase from the river flood land to the salt beach, which could be accounted for the organic matters including large algae, the bodies and excretion of marine animals due to the feedback of tides. The significant difference of SOC contents at different vegetation communities was observed, while the difference of SOC in soil profiles was not obvious. The SOC contents in 0-30cm soil layers decreased with plant growth period, while in 40-60cm soil layers were relatively stable. The mean soil organic carbon density was 3.05kgCm(-2) in study region, which was much lower than that reported in other ecosystems, and its spatiotemporal variations were consistent with that of SOC content. Further analysis revealed that SOC was positively correlated with total nitrogen and clay contents. Our findings indicated that the newborn coastal wetland in the YRD should be a potential sink of SOC.
机译：基于2009年黄河沿岸到海边两个样带的监测数据，研究了中国东部黄河三角洲（YRD）河口新生沿海湿地中土壤有机碳（SOC）的分布和季节变化。结果表明，样带0-60cm土层SOC含量范围为0.46〜10.15gkg（-1），土壤剖面平均值为2.15〜5.00gkg（-1）。从河滩到盐滩的SOC含量有增加的趋势，这可能是潮汐的反馈导致有机物包括大藻类，鱼体和海洋动物排泄物的原因。观察到不同植被群落SOC含量的显着差异，而土壤剖面SOC的差异不明显。 0-30cm土层的SOC含量随植物生长期的延长而降低，而40-60cm土层的SOC相对稳定。研究区的平均土壤有机碳密度为3.05kgCm（-2），远低于其他生态系统的报告，其时空变化与SOC含量一致。进一步的分析表明，SOC与总氮和粘土含量呈正相关。我们的发现表明，长三角地区新生的沿海湿地应该是SOC的潜在汇。

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