2018年石佛寺水库不同水深处香蒲生长状况及其影响因素研究

Growth Status of Typha angustifolia at Different Water Depths and Their Influence Factors in Shifosi Reservoir in 2018

为了研究石佛寺水库不同水深处香蒲的生长状况,于2018年6月30日、7月30日、8月29日和9月28日,采集石佛寺水库10 cm、20 cm、30 cm、40 cm、50 cm、60 cm和70 cm水深处的香蒲样品和各处5 cm深度的水样,计算香蒲种群密度,测量香蒲植株高度、基部直径、叶长、叶宽和计数分蘖数,称量香蒲鲜质量和干质量,测定香蒲叶片的SPAD值,并对各处水样的水质指标进行测定,分析不同水深和水质指标对香蒲生长状况的影响。研究结果表明,在不同水深处,香蒲各生长指标差异显著;在水深为50 cm处,香蒲的生长状况最优(8月29日香蒲种群密度为45 ind./m2,香蒲第4片叶片的叶宽为19.84 mm,香蒲基部直径为39.91 mm;6月30日、7月30日和8月29日香蒲分蘖数为每株分蘖出11株,7月30日香蒲叶片的SPAD值为58.99),香蒲具有较强的生存能力和繁殖能力;7月为香蒲生长最快的时期;4个采样日石佛寺水库5 cm深度水体pH为6.89~7.98,呈弱碱性;随着水深的加深,5 cm深度水样中的溶解氧、硝态氮和亚硝态氮含量逐渐减小,总氮和氨氮含量增大,总磷含量小幅度波动变化;水中的氨氮含量、溶解氧含量、硝态氮含量、亚硝态氮含量和水深是影响香蒲生长的主要因素。

In order to study the growth status of Typha angustifolia at different water depths in Shifosi Reservoir,Typha angustifolia samples at water depths of 10 cm, 20 cm, 30 cm, 40 cm, 50 cm, 60 cm and 70 cm were selected on June 30, July 30, August 29, and September 28, 2018, and water samples of 5 cm depth at different water depths were collected simultaneously. Population density of Typha angustifolia was calculated, and plant height, base diameter, leaf length, leaf width and tiller number were measured. Fresh quality and dry quality were weighed, and SPAD values of leaves were determined. The water quality indexes were determined. The effects of different water depths and water quality factors on the growth index were discussed. The results showed that the growth indexes of Typha angustifolia were different at different water depths. At the water depth was 50 cm, the growth status of Typha angustifolia was the best(the population density of Typha angustifolia was 45 ind./m2, the leaf width of the 4 th leaf of Typha angustifolia was 19.84 mm, and the diameter of the base of Typha angustifolia was 39.91 mm on August 29;the tiller number of Typha angustifolia was 11 on June 30, July 30 and August 29, and the SPAD value of leaves was 58.99 on July 30),which had strong survival ability and proliferation ability. July was the period with the fastest growth rate of Typha angustifolia. The pH of water samples at 5 cm depth in Shifosi Reservoir was 6.89-7.98 on the 4 sampling days. With the water depth increased, dissolved oxygen, nitrate nitrogen and nitrite nitrogen contents in the water samples at 5 cm depth gradually decreased, total nitrogen and ammonia nitrogen contents increased, total phosphorus content fluctuated slightly. Ammonia nitrogen content, dissolved oxygen content,nitrate nitrogen content, nitrite nitrogen content and water depth were the main limiting factors for the growth of Typha angustifolia in Shifosi Reservoir.