研究了在3种不同磷浓度(低浓度27.56±0.78μg.g^-1,中浓度52.85±1.30μg.g^-1,高浓度115.61±2.72μg.g^-1)基质中,不同种植密度(11和32株.m^-2)对野菱(Trapa incise Sieb.et Zucc.)生长和不同部位磷含量的影响。结果表明,在磷浓度不同的基质中,野菱单株的根、茎和叶干质量及总干质量都随种植密度的提高而增加。种植密度的高低对野菱茎直径和叶数没有显著影响(P>0.05),但在3种基质中,种植密度高的野菱植株的叶数都高于种植密度低的野菱植株。种植密度对野菱各部位干物质分配以及磷含量的影响因基质中磷浓度的不同而表现出不同的规律性;种植密度高的野菱植株的茎和叶片中的磷含量高于种植密度低的野菱植株,种植密度低的野菱植株的茎生物量比和根中的磷含量均高于种植密度高的野菱植株。研究结果显示,提高种植密度不仅能促进野菱个体的生长,且能促进磷在野菱体内的运输。

Effects of planting density on growth and phosphorus content in different parts of Trapa incisa Sieb.et Zucc. Cultivated in three substrata with different phosphorus concentrations (low concentration 27.56± 0.78μg·g-1, median concentration 52.85± 1.30μg·g-1and high concentration 115.61±2.72μg·g-1)were studied. The results show that dry weight of root, stem and leaf and total dry weight per plant all increase with the planting density increasing indifferent substrata. The planting density has no significant influence on stem diameter or leaf number(P> 0.05), but the leaf number of T. incisa under a high planting density is more than that of under alow planting density in all three substrata. The impact of planting density on biomass allocation and phosphorus content in different parts of T. incise varies with phosphorus concent ration in the substrata. The phosphorus content in stem and leaf increases as the planting density increasing, while biomass ratio of stem and phosphorus content in root decreases as the planting density increasing. It is concluded that the growth of T. incisa and the phosphorus translocation in the plant can be promoted by increasing planting density.