2种坛紫菜品系栽培生长参数及CNP固定效率比较

Comparison on growth parameters and sequestration efficiency of carbon, nitrogen and phosphorus between two strains of Pyropia haitanensis

以洞头海区养殖的'洞头本地菜'和'浙东1号'2种坛紫菜品系为研究材料,测定其不同收割期叶状体长度、干质量、CNP含量等参数,核算了S值、产量及CNP固定效率等指标。结果显示:随着收割期延长,2种坛紫菜品系的叶状体长度逐渐下降,单条叶状体干质量与S值逐渐增加,产量先升后降,CNP固定效率整体呈上升趋势。一水至四水'洞头本地菜'的单条叶状体长度、干质量均高于'浙东1号',二水至四水'洞头本地菜'的产量、CNP固定效率均高于'浙东1号',2种坛紫菜品系S值之间无明显差异。一水至四水'洞头本地菜'CNP总固定效率分别为900.74 kg/hm^2、110.16 kg/hm^2和14.16 kg/hm^2,'浙东1号'CNP总固定效率分别为683.34 kg/hm^2、84.3 kg/hm^2和10.75 kg/hm^2。上述指标在不同收割期均呈极显著差异(P<0.01),在不同品系间均无显著差异(P>0.05),研究结果有助于进一步认知坛紫菜养殖的生长性状与生态效益。

Two strains of Pyropia haitanensis('Native Dongtou'and'Eastern Zhejiang NO.1')were selected as research materials in Dongtou aquaculture district.The thallus length,dry weight,CNP content were determined at different harvest stages,as well as the S value,yield,and sequestration efficiency of carbon,nitrogen and phosphorus were calculated.The results showed that with the extension of harvest time,the thallus length of two strains of Porphyra haitanensis decreased gradually,the dry weight and S value of single thallus increased gradually,the yield increased first and then decreased,and the sequestration efficiency of CNP increased as a whole.The length and dry weight of single thallus of'Native Dongtou'from the first harvest to the fourth harvest were higher than those of'Eastern Zhejiang No.1'.The yield and CNP sequestration efficiency of'Native Dongtou'from the second harvest to the fourth harvest were higher than those of'Eastern Zhejiang No.1'.There was no significant difference in S value between the two strains of Porphyra haitanensis.The total sequestration efficiency of CNP for'Native Dongtous'from the first harvest to the fourth harvest was 900.74 kg/hm^2,110.16 kg/hm^2,14.16 kg/hm^2,respectively.The total sequestration efficiency of CNP for'Eastern Zhejiang NO.1'was 683.34 kg/hm^2,84.3 kg/hm^2 and 10.75 kg/hm^2,respectively.The above indexes showed extremely significant difference among different harvest stages(P<0.01),but no significant difference between different strains(P>0.05).The results are helpful to further understand the growth characteristics and ecological benefits of Porphyra haitanensis culture.