本文關(guān)鍵詞： 浮游植物 光照 水溫 營養(yǎng)鹽 P-I曲線　出處：《南京信息工程大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：太湖流域在經(jīng)濟(jì)與社會發(fā)展中具有舉足輕重的作用,隨著社會的發(fā)展水環(huán)境問題日益突出,水體浮游藻類的生長覆蓋狀況日益受到關(guān)注,藻類暴發(fā)關(guān)系到人們的生產(chǎn)生活。本文基于現(xiàn)場實測數(shù)據(jù),探究光、溫、營養(yǎng)鹽等對浮游植物初級生產(chǎn)力的影響規(guī)律,并對光、溫耦合模型進(jìn)行參數(shù)求解及初級生產(chǎn)力的模擬,探索藻類在暴發(fā)機(jī)制上的可能性。文章主要從兩大部分進(jìn)行展開：1.通過對初級生產(chǎn)力與光、溫、營養(yǎng)鹽的相關(guān)關(guān)系,進(jìn)行規(guī)律探究。分析浮游植物初級生產(chǎn)力及呼吸作用垂向分布特征,進(jìn)而探究水下光場及水溫對浮游植物生長的影響作用,并對初級生產(chǎn)力與三個影響因素相關(guān)性進(jìn)行分析。得到的結(jié)論如下：(1)單位葉綠素呼吸作用的值均較小,且其不隨水溫的垂直分布而呈現(xiàn)出明顯規(guī)律性變化趨勢;(2)水下光場對于混合藻類初級生產(chǎn)力具有明顯的影響,由于水體對于光照的衰減作用,太湖梅梁灣口出現(xiàn)光抑制的深度主要分布在水下0.1-0.3m區(qū)域；(3)各類營養(yǎng)鹽則是植物生長必不可少的營養(yǎng)因素,太湖梅梁灣口當(dāng)水體營養(yǎng)鹽組成中氮、磷元素質(zhì)量比大于19時,水體產(chǎn)氧率處于相對磷限制;而當(dāng)?shù)�、磷比小�?0,易產(chǎn)生相對氮限制；且太湖梅梁灣夏季主要為氮限制或者氮磷共同限制,而春秋季為磷限制。2.基于實測數(shù)據(jù)使用耦合光、溫、營養(yǎng)鹽的初級生產(chǎn)力模型,進(jìn)行參數(shù)計算與模擬評價,分析光、溫等聯(lián)合作用對于浮游植物初級生產(chǎn)力的影響情況,得到關(guān)于溫、光營養(yǎng)鹽等對于初級生產(chǎn)力影響的并且具有生態(tài)意義的相關(guān)參數(shù),為理解相關(guān)生態(tài)機(jī)制提供依據(jù)。結(jié)論有：(1)光、溫限制為浮游植物初級生產(chǎn)力的主要限制因素,混合藻類生長的最適水溫27.5℃,混合藻類的最適光強(qiáng)隨水溫的升高先緩慢增加后迅速減小,最適水溫條件下的最適光照強(qiáng)度為3.4(106J/m2*4h)；(2)富營養(yǎng)化水域中藻類在夏季溫、光適宜的時候最易達(dá)到最大潛在生產(chǎn)率為0.32m/l*4h(一日中10：00-14：00間4小時內(nèi)單位葉綠素產(chǎn)氧)。
[Abstract]:Taihu Lake Basin plays an important role in the economic and social development. With the development of the society, the water environment problems become more and more prominent, and the growth and coverage of phytoplankton has been paid more and more attention. Algae outbreaks are related to people's production and life. Based on the field data, the effects of light, temperature and nutrients on the primary productivity of phytoplankton are studied in this paper. The temperature coupling model is used to solve the parameters and simulate the primary productivity to explore the possibility of algae outbreak mechanism. This paper mainly starts from two parts: 1. Through the primary productivity and light temperature. The relationship between nutrients and phytoplankton was studied. The vertical distribution of primary productivity and respiration of phytoplankton was analyzed, and the effect of water temperature and light field on phytoplankton growth was explored. The correlation between primary productivity and three influencing factors was analyzed. The conclusion is as follows: 1) the value of chlorophyll respiration per unit is smaller. And it does not show a trend of regular change with the vertical distribution of water temperature. (2) the underwater light field has a significant effect on the primary productivity of mixed algae because of the attenuation of water to light. The depth of photoinhibition at the mouth of Meiliang Bay of Taihu Lake is mainly distributed in the area of 0.1-0.3 m underwater. 3) all kinds of nutrients are essential nutrient factors for plant growth. The ratio of nitrogen and phosphorus in the nutrient composition of Meiliang Bay estuary of Taihu Lake is more than 19:00, and the oxygen production rate of water is limited by relative phosphorus. When the ratio of nitrogen and phosphorus is less than 10, the relative nitrogen limit is easy to be produced. And Meiliang Bay in Taihu Lake in summer is mainly nitrogen or nitrogen and phosphorus constraints, while in spring and autumn is phosphorus limitation. 2. Based on the measured data using coupling light, temperature, nutrients and primary productivity model. The parameters were calculated and simulated to analyze the effect of light and temperature on the primary productivity of phytoplankton. Light nutrient and other related parameters which have ecological significance on primary productivity provide the basis for understanding the relevant ecological mechanism. Conclusion: 1) Light. Temperature limitation was the main limiting factor of primary productivity of phytoplankton. The optimum water temperature of mixed algae was 27.5 鈩，

本文編號：1479154