Nitrogen and phosphorus resorption of Artemisia scoparia, Chenopodium acuminatum, Cannabis sativa, and Phragmites communis under nitrogen and phosphorus additions in a semiarid grassland, China
Nitrogen and phosphorus resorption of Artemisia scoparia, Chenopodium acuminatum, Cannabis sativa, and Phragmites communis under nitrogen and phosphorus additions in a semiarid grassland, China
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DOI：
10.17221/6339-pse
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发表时间：
2012-10-01
影响因子：
2.4
通讯作者：
Yu, Z. Y.
中科院分区：
文献类型：
--
作者：
Li, L. J.;Zeng, D. H.;Yu, Z. Y.
在科尔沁桑迪半干旱草地上，采用因子试验研究了土壤氮磷有效性对草地养分吸收的影响。结果表明，对照区和施磷区的优势种为黄蒿和藜，施氮区和N + P区的优势种为大麻和芦苇。结果表明，不同种间N、P吸收量差异显著（P < 0.01）。随着土壤氮素有效性的增加，除芦苇对氮素再吸收效率（NRE）和氮素再吸收能力（NRP）的贡献率降低外，其余树种的NRE和NRP均呈下降趋势。同样，P再吸收能力（PRP）下降，除了所有物种的P，而P再吸收效率（PRE）不受P添加。不同植物对氮素的反应不同，而对磷素的反应除了芦苇对氮素的反应外，其余植物对氮素的反应均不明显。我们的研究结果表明，增加土壤养分的有效性可以直接影响植物介导的养分循环，改变叶片养分吸收和间接改变物种组成的桑迪草地。
A factorial nitrogen (N) x phosphorus (P) addition experiment was conducted to evaluate responses of leaf nutrient resorption to increased soil N and P availability in a semiarid grassland in Keerqin Sandy Lands, China. Four plant species were selected, among which Artemisia scoparia and Chenopodium acuminatum were dominant species in the control and P-added plots, and Cannabis sativa and Phragmites communis were dominant in the N- and N + P-treated plots. Results showed that N and P resorption varied substantially among species (P < 0.01). A general trend of decrease in N resorption efficiency (NRE) and N resorption proficiency (NRP) was observed in response to increased soil N availability for all species, except P. communis only for NRE. Similarly, P resorption proficiency (PRP) decreased in response to P addition for all species, whereas P resorption efficiency (PRE) was not affected by P addition. Species responded differently in terms of PRE and PRP to N addition, whereas no changes in NRE and NRP occurred in response to P addition except P. communis for NRE. Our results suggest that increased soil nutrient availability can influence plant-mediated nutrient cycling directly by changing leaf nutrient resorption and indirectly by altering species composition in the sandy grassland.