Biogeochemical characteristics of soil C, N, P in the tidal wetlands of the Yellow River Delta
This study analyzed the variations of soil organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP) in tidal wetland of the Yellow River Delta. While GRA2 surface was covered with Phragmites australis had much higher biomass and sufficiently stronger roots than GRA1 with Suaeda salsa. TOC and TN contents in GRA2 profile were higher than those in GRA1. The average TOC contents of GRA1 and GRA2 were 1.798 and 3.109 mg/g, respectively. It was obvious that GRA2 profile contained quite high TN content (a range of 0.307~0.473 mg/g) as compared to GRA1 profile(a range of 0.108~0.213 mg/g), possibly due to the higher organic matter retention in GRA2. The average TP content in GRA1 profile was slightly higher than that in GRA2, with values of 0.388 mg/g and 0.298 mg/g, in GRA1 and GRA2 respectively. The growth of P.australis in GRA2 area that needed more phosphorus than S. salsa in GRA1 area may be the potential explanation. However, no clear trend was found on the vertical variations of TP. Additionally, C, N, and P ecological stoichiometry had high complexities within this tidal wetland. The C/N ratios were generally higher, while the C/P ratios and the N/P ratios were comparatively low, indicating the coastal wetland biogeochemical processes were more limited by N and P, with the former may being the primary factor. This study would be helpful for future research on the carbon burial, nutrients balance, and promoting sustainable management of the coastal plain.
国家科技期刊平台
NSTL
万方数据
维普
