CAJ | 학술논문

通过室外受控实验,研究了在不同沉积物类型及不同水体营养水平条件下东太湖四角菱的生长特性.结果表明:沉积物类型对菱的各项生长指标均有显著影响.在营养相对丰富的湖泥中,菱的相对生长率、同化根与吸收根的生物量以及株高增长率分别为相对贫瘠的岸泥的4.3、2.4、7.3、2.5倍,菱盘直径增长率在湖泥中为16.5%,在岸泥中则为负增长(-13.2%).水体营养盐浓度升高在一定程度上也促进了菱的生长,而且营养盐浓度(尤其是磷)升高对菱生长的促进作用在岸泥中要比在湖泥中显著得多.探讨了沉积物类型与水体营养水平对菱生长的作用机理,并认为水体富营养化的加剧及湖泊沼泽化所造成的氮、磷等营养物质在沉积物中的大量积累是东太湖菱种群迅速扩张的重要原因之一.
통과실외수공실험,연구료재불동침적물류형급불동수체영양수평조건하동태호사각릉적생장특성.결과표명:침적물류형대릉적각항생장지표균유현저영향.재영양상대봉부적호니중,릉적상대생장솔、동화근여흡수근적생물량이급주고증장솔분별위상대빈척적안니적4.3、2.4、7.3、2.5배,릉반직경증장솔재호니중위16.5%,재안니중칙위부증장(-13.2%).수체영양염농도승고재일정정도상야촉진료릉적생장,이차영양염농도(우기시린)승고대릉생장적촉진작용재안니중요비재호니중현저득다.탐토료침적물류형여수체영양수평대릉생장적작용궤리,병인위수체부영양화적가극급호박소택화소조성적담、린등영양물질재침적물중적대량적루시동태호릉충군신속확장적중요원인지일.
Effects of nutrient levels in sediments and water column on growth of floating-leaved plant Trapa quadrispinosa were evaluated through a 2×2 factorial outdoor experiment. The results showed that nutrient levels of sediments had significant effects on the growth of T. quadrispinosa. For the relative growth rate (RGR), the percentage increase in plant height and rosette diameter, and the biomass of aquatic and anchoring roots, they were significantly greater in high-nutrient sediments than in low-nutrient sediments. Increased concentrations of nutrients in water could stimulate the growth of plant T. quadrispinosa. Nutrient addition (especially for phosphorus) in water resulted in a more significant plant growth in the low-nutrient sediments than in the high-nutrient sediments. The study suggests that eutrophication of water body and accumulated nutrients in sediments with swampy tendency may be causes that the stock biomass of floating-leaved macrophyte Trapa quadrispinosa in East Taihu Lake has increased rapidly recently.