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Variable leaf nitrogen-phosphorus ratios and stable resorption strategies of Kandelia obovata along the southeastern coast of China
Forest Ecology and Management ( IF 3.7 ) Pub Date : 2024-03-13 , DOI: 10.1016/j.foreco.2024.121822 Xiaofang Shi , Lin Zhang , Chao Liu , Yamian Zhang , Mao Wang , Wenqing Wang
Forest Ecology and Management ( IF 3.7 ) Pub Date : 2024-03-13 , DOI: 10.1016/j.foreco.2024.121822 Xiaofang Shi , Lin Zhang , Chao Liu , Yamian Zhang , Mao Wang , Wenqing Wang
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Coastal mangroves are strongly nutrient-limited, but a comprehensive understanding of nutrient concentration and resorption strategies in mangrove ecosystems is lacking. In this study, we measured leaf chemical stoichiometry of the mangrove species in winter (January) and summer (July) at six sites covering the latitudinal range of the species (19°N to 28°N) in China. Leaf nitrogen (N) and phosphorus (P) concentration and N:P ratio had distinct unimodal patterns along the latitudinal gradient in both seasons. Leaf N and P concentration varied seasonally, with significantly ( < 0.01) lower levels of N and P in winter than in summer at all sites. Seasonal differences were most pronounced at higher latitude sites. Nutrient resorption efficiencies (NuRE) were high in mangroves, with N resorption efficiency (NRE) consistently higher than P resorption efficiency (PRE) across all sites and seasons. The average NRE was 70.86%, whereas the average PRE was 52.73%. In contrast to variations in N and P concentration and N:P ratios, variability in NuREs and the NRE:PRE ratio was lower, with less pronounced interseason variations. Notably, NRE was significantly different in the Fugong and Leizhou sites, whereas both PRE and NRE:PRE ratios were significantly different only in the Fuding site. Among potential factors controlling nutrient resorption strategies in mangroves, the NRE:PRE ratio was significantly negatively related to green leaf N:P ratio during the summer ( = 0.148, = 0.036) but was significantly positively related to sediment N:P ratio during the winter ( = 0.165, = 0.026) and the merged data of two seasons ( = 0.071, = 0.039). Overall, the results suggest that mangroves are strongly limited by N, and N limitation, along with nutrient stoichiometry, collectively influences nutrient resorption strategies.
更新日期：2024-03-13
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