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Effects of soil nitrogen:phosphorus ratio on growth rate of Artemisia ordosica seedlings

查看全文 作　　者：Wei [1]Wu;XingDong [1]He;HuaCong [1]Ci;Rong [1]Li;PingPing [1]Xue;YuBao [1]Gao;HaLin [2]Zhao 高影响力作者 机构地区：[1]College of Life Sciences,Nankai University,Tianjin 300071,China;[2]Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Science,Lanzhou,Gansu 730000,China高影响力机构 出　　处：《Research in Cold and Arid Regions》索引2010年第2卷第4期,共7页高影响力期刊 基　　金：supported in part by the National Basic Re-search Program of China (2009CB421303);supported by National Natural Science Foundation of China (30970546) 摘　　要：To address how the ratios of nitrogen and phosphorus (N:P ratios) in soil affect plant growth, we performed a two-factor (soil available N:P ratios and plant density) randomized block pot experiment to examine the relationships between soil N:P ratios, and the N:P ratios and growth rate of Artemisia ordosica seedlings. Under moderate water stress and adequate nutrient status, both soil N:P and plant density influenced the N:P ratios and growth rates of A. ordosica. With the increase of soil N:P ratios, the growth rates of A. ordosica seedlings decreased significantly. With the increase of soil N:P ratios, N:P ratios in A. ordosica seedlings increased significantly. While the nitrogen concentrations in the plant increased slightly, the phosphorus concentrations significantly decreased. With the increase of plant density, the shoot N:P ratios and growth rates significantly decreased, which resulted from soil N:P ratios. Thus, soil N:P ratios influenced the N:P ratios in A. ordosica seedlings, and hence, influenced its growth. Our results suggest that, under adequate nutrient environment, soil N:P ratios can be a limiting factor for plant growth. 关 键 词：ARTEMISIA ORDOSICA soil N:P RATIO PLANT N:P RATIO PLANT growth rate nutrient limitation
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