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ผลกระทบของปูที่ขุดดินProperties Burrow trapping significantly affected soil physical and chemical properties and texture (Figures 3 and 4). The soil deposited into burrow mimics contained a lower proportion of fine grain and a higher salinity compared to the excavated soil (Figure 3A,B). Excavated soil was characterized by higher water content and lower bulk density (Figure 4D,E). Excavated and deposited soils had higher nutrient concentrations compared to the surrounding background soil. TN, TOC and TOC/TC ratios were all significantly different among the four soil sources and ranked in a descending order of deposited, excavated soil, background surface,and subsurface soil (Figure 3D–F). TC of excavated soil was the highest, followed by that of deposited soil, background surface, and subsurface soil(Figure 3C). The C/N ratio of deposited soil was the lowest whereas that of background soil was the highest (Figure 3G). In addition, NO3-N, NH4-N,and inorganic N concentrations of excavated soil were significantly higher than those of background surface and subsurface soil (Figure 4A–C).Although burrow size had no significant effects on the properties of excavated soil, it significantly affected TC, TOC, C/N ratio, and salinity of deposited soil (Table A5 Supplemental Material).Burrows might interact with physical and chemical conditions of different habitat types,which affected the nutrient concentrations of soil transported. Soil in Phragmites and Spartina marshes had higher water content and lower bulk density than those in mudflats (Figure 4D, E), although there were no significant differences in soil grain size and salinity among the habitats (Figure 3A, B).Soil in Phragmites and Spartina marshes had significantly higher TN, TC and TOC, and TOC/TC ratios,and hence, lower C/N ratios compared to those in mudflats (Figure 3C–G). Moreover, the interaction between habitat type and soil source was significant(Table A3 Supplemental Material). NH4-N andTIN concentrations of surface soil in Phragmites marshes were significantly higher than those in both Spartina marsh and mudflats, but NO3-N concentration was not different among the three habitats (Figure 4A–C, Table A4).Soil properties correlated with soil amounts transported (Figure 5, Table A6 Supplemental Material). The TN, TC, TOC, and TOC/TC ratio of the excavated soil negatively correlated with the amount of soil transported (Figure 5A–C, E),whereas the C/N ratio positively correlated with soil amount (Figure 5D). For deposited soil, its TN and TOC/TC ratio negatively correlated with amount of soil transported, whereas its TC positivel correlated with the soil amount and TOC did not correlate with soil amount. Soil salinity of deposited soil negatively correlated with soil transported, but the correlation for excavated soil was insignificant. Soil grain size did not correlate with the amount of soil transported
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