Study of the enrichment of soil organic matter and water movement around the Tamarix chinensis shrubs in the coastal wetlands of the Yellow River Delta
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Abstract:
To investigate the promoting effect of water movement on soil nutrients beneath the Tamarix chinensis shrubs in the coastal wetlands, we analyzed the soil organic matter at different locations and soil layers around a Tamarix chinensis and the isotopes of soil water, surface water, and Yellow River water. The results showed that: (1) Soil organic matter is enriched around the trunk of Tamarix chinensis shrubs, forming a 20-cm-deep enriched circle-layer with a 1.5-m radius. Soils under shrub canopy have significantly higher content of organic matter compared to those under the canopy edge and at the open spaces between plants. Deeper soils have less content, showing prominent “fertile island” effects. (2) The hydrogen and oxygen stable isotopes at different soil profiles were different. In the 0-5cm topsoil, the δD and δ18O isotopic values are from large to small under shrub canopy, under canopy edge, and at the open spaces. In the 5-10cm soil layer, the δD and δ18O isotopic values are from small to large under shrub canopy, under canopy edge, and at the open spaces. The isotopic values in the 0-5cm topsoil are greater than those in the 5-10cm soil layer. (3) Water movement has an effect on the content of organic matter. The nutrients carried by stemflow and the lateral seepage of the Yellow River are two of the reasons why the content of organic matter is from large to small under shrub canopy, under canopy edge, and at the open spaces. The enrichment of soil organic matter has changed the physicochemical properties of the soil around the plant. The small-scale spatial heterogeneity of soil nutrients has promoted the growth of the Tamarix chinensis and the surrounding plants. The research results can provide reference for the saline soil reclamation and vegetation recovery in the Yellow River Delta.
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