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根据室内和围隔实验中海带幼孢子体在不同硝态氮浓度下的生长情况和光合作用速率(Pmax),分析了幼孢子体的N需求,得到其最大生长率(μm)为0.12d-1,维持生存的最低组织N含量(NQ)为16.8μg/mgDW,以最大生长率生长所必需组织N的临界值(NC)为20.4μg/mgDW,每天以最大速率生长的N需求(Nreq)为2.45μg/mgDWd-1。同时,不同处理组的初始NO3-N浓度越高,海带幼孢子体吸收速率和组织N的累加速率越高,且呈明显的线性相关关系(R2分别为0.8393和0.7793,P<0.05)。现场围隔实验中,叶绿素a含量(R2=0.7907,P<0.05)和组织N含量(R2=0.9147,P<0.01)与Pmax也呈明显的线性相关关系。同时,根据海带幼孢子体N的需求和营养吸收状况,分析认为,海带幼孢子体存在受到N限制的风险,但凭其营养吸收能力有适应N限制的能力。还根据海带的这种生理特征,探讨了大型海藻的养殖对富营养化海水的生态调控。
According to the growth and photosynthetic rate (Pmax) of kelp sporophytes under different concentrations of nitrate nitrogen in laboratory and enclosure experiments, the requirement of N of the sporophytes was analyzed and the maximum growth rate (μm) was 0.12d- 1, the minimum survival tissue N content (NQ) was 16.8μg / mgDW, and the critical value of tissue N required for growth at maximum growth rate (NC) was 20.4μg / mgDW, and Nreq (Nreq) 2.45 μg / mgDWd-1. At the same time, the higher initial NO3-N concentration in different treatment groups, the higher the rate of kelp sporulation and the accumulation rate of tissue N (R2 0.8393 and 0.7793, P <0.05, respectively). There was a significant linear correlation between Pmax and chlorophyll-a content (R2 = 0.7907, P <0.05) and tissue N content (R2 = 0.9147, P <0.01) in field enclosure experiments. In the meantime, according to the demand and nutrient absorption of kelp sporozoite N, it is considered that the kelp larvae are at risk of being restricted by N, but N adapts to their ability to absorb N nutritionally. According to the physiological characteristics of kelp, the ecological regulation of eutrophication of seawater by large-scale seaweed farming is discussed.