| Effects of soil nitrate：ammonium ratio on plant carbon：nitrogen ratio and growth rate of Artemisia sphaerocephala seedlings |
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| 作者姓名： | Rong Li XingDong He PingPing Xue HuaCong Ci Wei Wu YuBao Gao HaLin Zhao |
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| 作者单位： | [1]College of Life Sciences, Nankai University, Tianjin 300071, China [2]Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China |
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| 基金项目： | supported in part by the National Basic Research Program of China （2009CB421303）; supported by National Natural Science Foundation of China （30970546） |
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| 摘 要： | Can soil nitrate： ammonium ratios influence plant carbon： nitrogen ratios of the early succession plant？ Can plant carbon： nitrogen ratios limit the plant growth in early succession？ To address these two questions, we performed a two-factor （soil nitrate： ammonium ratio and plant density） randomized block design and a uniform-precision rotatable central composite design pot experiments to examine the relationships between soil nitrate： ammonium ratios, the carbon： nitrogen ratios and growth rate of Artemisia sphaerocephala seedlings. Under adequate nutrient status, both soil nitrate： ammonium ratios and plant density influenced the carbon： nitrogen ratios and growth rate of A. sphaerocephala seedlings. Under the lower soil nitrate： ammonium ratios, with the increase of soil nitrate： ammonium ratios, the growth rates of plant height and shoot biomass of A. sphaerocephala seedlings decreased significantly; with the increase of plant carbon： nitrogen ratios, the growth rates of shoot biomass of A. sphaerocephala seedlings decreased significantly. Soil nitrate： ammonium ratios affected the carbon： nitrogen ratios of A. sphaerocephala seedlings by plant nitrogen but not by plant carbon. Thus, soil nitrate： ammonium ratios influenced the carbon： nitrogen ratios of A. sphaerocephala seedlings, and hence influenced its growth rates. Our results suggest that under adequate nutrient environment, soil nitrate： ammonium ratios can be a limiting factor for the growth of the early succession plant.
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| 关 键 词： | 土壤硝态氮 氮碳比 白沙蒿 生长率 植物 幼苗 地上部生物量 铵 |
Effects of soil nitrate:ammonium ratio on plant carbon:nitrogen ratio and growth rate of Artemisia sphaerocephala seedlings |
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| Rong Li,XingDong He,PingPing Xue,HuaCong Ci,Wei Wu,YuBao Gao,HaLin Zhao.Effects of soil nitrate:ammonium ratio on plant carbon:nitrogen ratio and growth rate of Artemisia sphaerocephala seedlings[J].Sciences in Cold and Arid Regions,2010,2(5):0445-0454. |
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| Authors: | Rong Li XingDong He PingPing Xue HuaCong Ci Wei Wu YuBao Gao and HaLin Zhao |
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| Institution: | College of Life Sciences, Nankai University, Tianjin 300071, China;College of Life Sciences, Nankai University, Tianjin 300071, China;College of Life Sciences, Nankai University, Tianjin 300071, China;College of Life Sciences, Nankai University, Tianjin 300071, China;College of Life Sciences, Nankai University, Tianjin 300071, China;College of Life Sciences, Nankai University, Tianjin 300071, China;Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China |
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| Abstract: | Can soil nitrate: ammonium ratios influence plant carbon: nitrogen ratios of the early succession plant? Can plant carbon: nitrogen ratios limit the plant growth in early succession? To address these two questions, we performed a two-factor (soil nitrate: ammonium ratio and plant density) randomized block design and a uniform-precision rotatable central composite design pot experiments to examine the relationships between soil nitrate: ammonium ratios, the carbon: nitrogen ratios and growth rate of Artemisia sphaerocephala seedlings. Under adequate nutrient status, both soil nitrate: ammonium ratios and plant density influenced the carbon: nitrogen ratios and growth rate of A. sphaerocephala seedlings. Under the lower soil nitrate: ammonium ratios, with the increase of soil nitrate: ammonium ratios, the growth rates of plant height and shoot biomass of A. sphaerocephala seedlings decreased significantly; with the increase of plant carbon: nitrogen ratios, the growth rates of shoot biomass of A. sphaerocephala seedlings decreased significantly. Soil nitrate: ammonium ratios affected the carbon: nitrogen ratios of A. sphaerocephala seedlings by plant nitrogen but not by plant carbon. Thus, soil nitrate: ammonium ratios influenced the carbon: nitrogen ratios of A. sphaerocephala seedlings, and hence influenced its growth rates. Our results suggest that under adequate nutrient environment, soil nitrate: ammonium ratios can be a limiting factor for the growth of the early succession plant. |
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| Keywords: | soil nitrate: ammonium ratio plant carbon: nitrogen ratio growth rate nitrogen limitation plant community succession |
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