不同水流流速对大叶藻移植植株存活、生长及光合色素含量的影响

Effects of different current velocities on survival,growth and photosynthetic pigment contents of Zostera marina transplants

在山东荣成典型潟湖—天鹅湖选取4个不同水流流速区域（6.5、8.2、11.8、24.6 cm/s）,利用枚订法进行大叶藻植株移植,监测不同水流流速条件下移植植株存活、生长及光合色素含量的变化,确定大叶藻植株移植修复海区适宜水流流速范围。结果显示,移植90 d后,各水流流速条件下移植植株全部存活;6.5~8.2 cm/s条件下移植植株地上组织的形态学指标、质量和生产力均显著高于11.8~24.6 cm/s处理组,而地下组织的各指标则在6.5 cm/s水流流速时达到最小值;移植植株各光合色素含量的变化一致,均在24.6 cm/s水流流速时达到最大值,是其余处理组的1.2~1.3倍,6.5~11.8 cm/s处理组之间无明显差异。综合分析表明,利用枚订法移植的大叶藻植株至少可以耐受6.5~24.6 cm/s的水流环境,其适宜的水流流速阈值为8~10 cm/s。

Zostera marina transplantation was conducted using the staple method in Swan Lake, a typical lagoon in Rongcheng bay of Shandong Peninsula, China. To determine the suitable current velocity range for Z. marina trans- plants, survival, growth and photosynthetic pigment contents of Z. marina transplants were examined under different current velocities （6.5,8.2,11.8 and 24.6 cm/s）. After 90 days transplantation, survival rate of Z. mar/ha trans- plants were up to 100%. Under 6.5 to 8.2 cm/s current velocities, the morphological parameters, mass and productivi- ty of Z. marina transplants above ground tissues were significantly higher than those of transplants under 11.8 to 24. 6 cm/s current velocities. However these parameters of below ground tissues of Z. marina transplants reached to the min- imum in 6.5 cm/s. The photosynthetic pigment contents of all transplants showed the same trends and reached the maximum under 24.6 cm/s current velocity, which were 1.2 - 1.3 folds higher than other treatments. No significant differences were detected among treatments from 6.5 to 11.8 cm/s. Comprehensive analysis suggests that Z. marina transplants using the staple method can survive at least in the current velocity range from 6.5 to 24.6cm/s, and the suitable current velocity range for the transplants is from 8 to 10 cm/s.