Li Xiaobo

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  • Article
    Response of plant nutrient stoichiometry to fertilization varied with plant tissues in a tropical forest
    (Nature Publishing Group, 2015-09-29) Mo, Qifeng ; Zou, Bi ; Li, Yingwen ; Chen, Yao ; Zhang, Weixin ; Mao, Rong ; Ding, Yongzhen ; Wang, Jun ; Lu, Xiankai ; Li, Xiaobo ; Tang, Jianwu ; Li, Zhian ; Wang, Faming
    Plant N:P ratios are widely used as indices of nutrient limitation in terrestrial ecosystems, but the response of these metrics in different plant tissues to altered N and P availability and their interactions remains largely unclear. We evaluated changes in N and P concentrations, N:P ratios of new leaves (<1 yr), older leaves (>1 yr), stems and mixed fine roots of seven species after 3-years of an N and P addition experiment in a tropical forest. Nitrogen addition only increased fine root N concentrations. P addition increased P concentrations among all tissues. The N × P interaction reduced leaf and stem P concentrations, suggesting a negative effect of N addition on P concentrations under P addition. The reliability of using nutrient ratios as indices of soil nutrient availability varied with tissues: the stoichiometric metrics of stems and older leaves were more responsive indicators of changed soil nutrient availability than those of new leaves and fine roots. However, leaf N:P ratios can be a useful indicator of inter-specific variation in plant response to nutrients availability. This study suggests that older leaf is a better choice than other tissues in the assessment of soil nutrient status and predicting plant response to altered nutrients using nutrients ratios.