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

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。

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

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 transplants,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.marina transplants were up to 100%.Under 6.5 to 8.2 cm/s current velocities,the morphological parameters,mass and productivity 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 minimum 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 24.6 cm/s,and the suitable current velocity range for the transplants is from 8 to 10 cm/s.