九寨沟湖泊水质对杉叶藻生长及叶绿素荧光特性的影响  

Influence of water quality on growth and chlorophyll fluorescence parameters of Hippuris vulgaris in Jiuzhaigou National Nature Reserve

作　　者：高丽楠[1] 

机构地区：[1]成都大学旅游与经济管理学院,四川成都610106

出　　处：《浙江农业学报》2016年第5期857-863,共7页Acta Agriculturae Zhejiangensis

基　　金：高等学校学科创新引智计划项目(B08037)

摘　　要：在夏季7月利用HACH便携式水质分析仪和Junior-PAM调制叶绿素荧光仪,选择九寨沟芳草海、箭竹海和五花海优势沉水植物杉叶藻(Hippuris vulgaris)为试验对象,对湖泊水质、沉水杉叶藻生物量、叶面积和快速光响应曲线日动态进行测定,以揭示杉叶藻的生长、光合特征与湖泊水质的关系。结果显示:不同湖泊环境条件下沉水杉叶藻的株高、叶面积、生物量存在显著差异,且各生长特征值均为箭竹海最大。沉水杉叶藻的最大相对电子传递速率(r ETR_(max))和半饱和光强(E_k)在箭竹海和五花海均呈双峰曲线,在芳草海呈单峰曲线;五花海沉水杉叶藻的r ETR_(max)和E_k日平均值极显著高于箭竹海和芳草海,说明五花海沉水杉叶藻有更高的光合能力和对强光的耐受能力。湖泊水质与杉叶藻的生物量、r ETR_(max)的通径分析及逐步回归分析结果表明,湖泊硝酸盐含量是影响杉叶藻生物量的决定因子,湖泊电导率为限制因子;影响杉叶藻r ETR_(max)的决定因子为湖泊的水温,湖泊总硬度为限制因子。In summer,we selected a dominant Hippuris vulgaris in Jiuzhaigou to examine biomass,leaf area,diurnal rapid light curves（ RLCs） and water quality in three lakes,namely Grass Lake（ GL）,Arrow Bamboo Lake（ ABL）and Five Colored Lake（ FCL）,in order to investigate the effects of water quality on its growth and photosynthetic characteristics. The results showed that there were significant differences in plant height,leaf area and biomass under different lake conditions,and the value of ecological characteristics of ABL were the largest. Submerged Hippuris vulgaris in GL showed a significant diurnal variation in maximum relative electron transport rate（ r ETR_（max）） and saturating photon flux（ E_k）,but in ABL and FCL,diurnal variation of submerged Hippuris vulgaris appeared to be a marked double-peak. The daily averages of r ETR_（max）,E_kof submerged Hippuris vulgaris in FCL was significantly greater than that of other two lakes,therefore submerged Hippuris vulgaris in FCL was a plant with a strong photosynthetic capacity for acclimation to high light intensity. By the path analysis between the biomass and water quality and r ETR_（max）,the results showed that biomass was determined by water nitrate（ NO-3） content,which was the most important factor,while conductivity was the limiting factor. The determined factor for r ETR_（max）was water temperature,while total hardness was the limiting factor.

关 键 词：湖泊水质 杉叶藻 生物量 

分 类 号：Q945.79[生物学—植物学]