摘要
植物净光合速率(P_n)与叶性状的环境响应,对理解异质性生境中植物叶片物理构建与生理代谢的关系具有重要意义。采用线性回归的方法,按照芦苇种群地下水埋深和地表水水位变化规律设置:Ⅰ(地下水埋深0.3—0.6 m)、Ⅱ(地下水埋深0—0.3 m)、Ⅲ(地表水水位0—0.3 m) 3个梯度,研究了土壤水分影响下芦苇(Phragmites australias)的P_n与叶面积(LA)、叶厚度的关系。结果表明:随着土壤水分的增加,湿地植被群落的高度、盖度和地上生物量呈逐渐增大的趋势,芦苇的LA、叶片P_n呈现逐渐增加的趋势,而叶厚度呈减小趋势;在样地(Ⅰ)和样地(Ⅲ)芦苇的P_n与LA之间分别存在极显著负相关和正相关关系(P <0.01),而与叶厚度之间分别存在极显著正相关和负相关关系(P<0.01);在样地(Ⅱ),芦苇的P_n与LA之间呈显著正相关关系(P<0.05),与叶厚度之间仅呈显著负相关关系(P<0.05)。随着土壤水分的增加,芦苇选择了增大叶面积、减小叶厚度,相应增大P_n的生存策略,体现了芦苇种群在异质生境中较强的叶片表型可塑性,从而更好地适应特殊的湿地生境。
The environmental response of plant net photosynthetic rate and leaf traits has great significance to understanding the relationship between the physical structure and physiological metabolism of plant leaves under different habitat conditions. There were two main goals in this study：（1） To evaluate the relationship between the net photosynthetic rate and leaf characteristics of Phragmites australis in different soils; （2） to determine the main reasons for this relationship. The study site was located in the national wetland park conservation areas in Jiayuguan city, Gansu Province, China（39°54＇10.55″-39°56＇42.26″ N, 98°25＇56.98″-98°29＇25.23″ E）. The sample area was divided into three levels based on the variation rule of groundwater depth and surface water level in reed populations：I （groundwater depth：0.3-0.6 m）, Ⅱ （groundwater depth：0-0.3 m）, Ⅲ （surface water level：0-0.3 m）. According to the ＂Z＂ order curve, six （2×2 m） reed samples were selected per plot, for a total of 18 samples （3×6）. Then, community traits （height and aboveground biomass）, soil moisture and soil electrical conductivity （EC） were determined and six individuals of P. australis were taken to the laboratory to measure the leaf thickness. In addition, the leaf net photosynthetic rate （Pn）, transpiration rate （Tr） and other parameters of the reeds were measured in each plot. Quadrat survey methods were used to determine the relationship between the net photosynthetic rate and leaf traits of the reeds. The results indicated that, with the increase of soil moisture, the wetland community height gradually increased, as well as the coverage, aboveground biomass, leaf area and net photosynthetic rate. However, the leaf thickness and soil EC gradually decreased. A highly significant negative and positive correlation （P 〈 0.01） between Pn and LA at height and low moisture（I, Ⅲ） was observed, respectively. There was a significant positive correlation bet
作者
张晶
赵成章
李雪萍
任悦
雷蕾
ZHANG Jing;ZHAO Chengzhang;LI Xueping;REN Yue;LEI Lei(College of Geography and Environmental Science,Northwest Normal University,Research Center of Wetland Resources Protection and Industrial Development Engineering of Gausu Province,Lanzhou 730070,China)
出处
《生态学报》
CAS
CSCD
北大核心
2018年第17期6084-6091,共8页
Acta Ecologica Sinica
基金
国家自然科学基金项目(41461013
91125014
41361010)
甘肃省生态学重点学科基金项目
关键词
净光合速率
叶厚度
叶面积
芦苇
嘉峪关草湖国家湿地公园
土壤含水量
net photosynthetic rate
leaf thickness
leaf area
Phragmites australis
National Grass Lake Wetland Pack ofJiayuguan
soil moisture
