摘要
从2014年10月至2015年7月,对广东流沙湾海草床3个海岸带(远岸带A、中海岸带B及近岸带C)中的喜盐草(Halophila valios)进行了季节性调查,研究喜盐草上附着生物的现存量、叶绿素a含量的季节变化及其对喜盐草的光合速率的影响。结果发现,附着生物的现存量及叶绿素a含量存在明显的季节性,其变化依次为春季﹥冬季﹥夏季﹥秋季,春季达到最高峰,两者含量分别为0.605 mg/g和0.118 mg/g,且在近岸带附着生物的含量要略高于中海岸带和远岸带。附着生物对喜盐草的光合速率存在着明显的抑制效应,并随含量的增加,其抑制作用增强。在春季,最大光合抑制率可达50.72%,冬、夏季次之,分别为47.13%和37.15%,在附着生物含量最低的秋季,抑制率也可达30.61%。由此表明,水体中营养盐浓度的增加会促使喜盐草上附着生物不断生长和累积,进而导致喜盐草的衰亡加速。
In order to study the inhibition effects of epiphyte on photosynthesis rate of the plant and the seasonal variation in epiphyte biomass and content of Chlorophyll-a, samples from three different coastal zones（far-shore zone, in term of A and middle-shore zone, in term of B and near-shore zone, in term of C） in Liusha Bay in Guangdong from October 2014 to July 2015 are collected. The results showed that there was a prominent seasonal variability of the epiphyte biomass and Chlorophyll-a. The amount of epiphyte biomass and Chlorophyll-a descended seasonally in the following sequence： Spring winter, summer and autumn, with the maxim amount of epiphyte biomass, 0.605 mg/g, and Chlorophyll-a, 0.118 mg/g, in spring, and the minimal amount of epiphyte biomass and Chlorophyll-a in autumn. In addition, the amount of epiphyte biomass at C was slightly higher than that at B and A. And the photosynthesis efficiency of Halophila ovalis was significantly inhibited by the epiphyte, and the maximum inhibition rate was up to 50.34% in spring, followed by winter and summer with inhibition rates of 47.13% and 37.15% respectively. However, with a low epiphyte biomass in autumn, the photosynthesis rate of Halophila ovalis was 30.61%. Researches show that the epiphyte biomass can grow and accumulate continuously with the increase of nutrient concentration in water, and in turn accelerate the death of Halophila ovalis.
出处
《广东海洋大学学报》
CAS
2015年第6期70-76,共7页
Journal of Guangdong Ocean University
基金
广东省科技计划项目(2013B051000081)
关键词
海草床
附着生物
喜盐草
光合速率
seagrass bed
epiphyte
Halophila ovalis
photosynthesis rate
