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	Stoichiometric ratios in soil are relevant to the abundance of constructive species in reed-dominated saline-alkaline marshes
	Ying, Liu1,2; Maohua, Ma1; Zhi, Ding3,4; Pujia, Yu4; Yanjing, Lou2; Bo, Liu2; Ming, Jiang2; Xianguo, Lue2
	2024
摘要	Ecological stoichiometry is an important mediator of the feedback between plant and soil systems, which greatly affects ecosystem processes and functions. However, how carbon (C), nitrogen (N) and phosphorus (P) stoichiometry in plants and soils influence helophytes' performance to environmental changes remain unclear. In this study, the saline-alkaline marsh dominated by Phragmites australis in the Western Songnen Plain of China was investigated, and soil and plant samples along a saline-alkaline and flooding gradient were collected in 22 marsh sites. The results showed that C, N and P contents of leaf and soil and soil C:N:P stoichiometric ratios decreased significantly with increasing soil salt content (p < 0.05), but increased significantly with increasing flooding depth (p < 0.05). Soil C:N:P ratios decreased by 24.6 %-47.1 % in severely salinised sites (>5 g kg(-1)) than in unsalinised sites (<1 g kg(-1)), and they increased by 11.0 %-99.0 % in deeply flooded sites (>5 cm) than in shallowly flooded sites (<5 cm). Changes rates of foliar C:N:P ratios were remarkedly smaller than those of soil C: N:P ratios. Foliar N and P contents increased with increasing soil N and P contents, but foliar C:P and N:P ratios had negative associations with soil C:P and N:P ratios. The abundance of P. australis was explained by soil C:N:P stoichiometric ratios more than individual contents of C, N and P, in which soil N:P ratio played the largest role. These results suggest that maintaining the balances amongst C, N and P in soil is critical when restoring degraded marsh ecosystems.
关键词	C:N:P stoichiometry Plant-soil interaction Soil nutrient Soil pH Plant abundance
DOI	10.1016/j.catena.2023.107548
发表期刊	CATENA
ISSN	0341-8162
卷号	234页码:8
通讯作者	Yanjing, Lou(louyj@iga.ac.cn) ; Ming, Jiang(jiangm@iga.ac.cn)
收录类别	SCI
WOS记录号	WOS:001099954900001
语种	英语