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Effects of soil nitrate:ammonium ratio on plant carbon:nitrogen ratio and growth rate of Artemisia sphaerocephala seedlings 被引量:1
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作者 Rong Li XingDong He +4 位作者 PingPing Xue HuaCong Ci Wei Wu YuBao Gao HaLin Zhao 《Research in Cold and Arid Regions》 2010年第5期445-454,共10页
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 question... 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. 展开更多
关键词 soil nitrate ammonium ratio plant carbon: nitrogen ratio growth rate nitrogen limitation plant community succession
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