不同氮磷比对多年生水生植物生长特性影响的研究
Influence of different nitrogen∶phosphorus on growth characteristic of perennial aquatic plant
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摘要: 从氮、磷等植物生长的环境因子出发,研究了高低氮磷营养水平下,不同氮/磷比例的富营养化水体对聚草(Myriophyllum spicatum)、黄花水龙(Jussiaea stipulacea Ohwi)、喜旱莲子草(Alternanthera philoxeroides)生长特性的影响。结果表明,聚草在氮磷比2∶1时生物量最大,且生物量在高浓度水平处理明显大于低浓度水平处理(P<0.01);黄花水龙在氮磷比10∶1~20∶1时生物量最大,高低浓度水平处理间生物量无Abstract: The growth characteristics of Myriophyllum spicatum,Jussiaea stipulacea Ohwi,Alternanthera philoxeroides were studied in different N∶P ratios at different nutritional levels. The result indicated that M. spicatum had the maximum biomass at the ratio of 2∶1,and the biomass was higher at higher ratio than at lower ratio of 2∶1 (P<0.01). J. stipulaceai showed biomass peaks at the ratio of 10∶1 and 20∶1,no significant difference between biomass at higher level and lower level was present. A. philoxeroides had the highest biomass at 20∶1 and 40∶1,there was significant difference in biomass between higher ratio and lower ratio (P<0.05). At low level,nitrogen was the limiting factor for J. stipulacea and A. philoxeroides,while phosphorus was the limiting factor for M. spicatum. Increase of Chl a content in A. philoxeroides was found at low N and P treatment. Chla content of J. stipulacea did not vary significantly between high and low N and P level treatments. The nutritional level stimulated stem growth of M. spicatum more than J. stipulacea and A. philoxeroides.
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Key words:
- uncertainty evaluation /
- GC/MS /
- VOCs /
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