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ผลของการอยู่อาศัยของชนิดและขนาดที่มุดดินหมุนเวียนTN, TC, and TOC amounts of excavated soil were significantly affected by both habitat type and burrow size. TC and TOC amounts excavated in mudflats were higher than those in Phragmites and Spartina marshes, but TN amount was not significantly different among the habitats (Figure 6). TN,TC, and TOC amounts excavated all increased with increasing burrow diameter.Both habitat type and burrow mimic size significantly affected the amounts of soil nutrients deposited, which were also higher in mudflats than in Phragmites and Spartina marshes. Larger burrow mimics trapped more soil nutrients (Figure 6). The amount of nutrients excavated was much greater than that deposited into burrow mimics, and crab burrowing resulted in a net transport of TC, TN, and TOC to the marsh surface. The net transport of TN and TOC was not significantly different among habitats, whereas that of TC in mudflats was significantly higher than that in the vegetated marshes. Meanwhile, net transport of TN, TC, and TOC to the surface increased with increasing burrow size (Figure 6).The soil mass, TC, TN, and TOC amounts excavated and deposited into burrow mimics, and net transport to the surface (that is, excavation minus deposition) per unit area were estimated, with these values being the highest in mudflats and the lowest in Spartina marshes (Table 2). The soil mass per unit volume was the highest in mudflats and the lowest in Spartina marshes. The total C and N per unit volume were the highest in Phragmites marshes, whereas those in Spartina marshes were the lowest. TOC per unit volume was also the highest in Phragmites and the lowest in mudflats(Table 2).The turnover rates of soil, TC, TN, and TOC through crab burrowing were the highest in mudflats,followed by Phragmites marsh and Spartina marsh (Table 2). The estimated mean turnover time was 1–4 years in this study (Table 2). The turnover times of soil, TC, and TOC in Spartina marsh were the longest, and those in mudflats were the shortest. However, the turnover time of TN in Phragmites marsh was longer than that in Spartina marsh (Table 2)
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