不同灌水量对幼龄胡杨光合特性日变化的影响及其与环境因子的关系  

Effects of Different Irrigation Rates on Diurnal Changes of Photosynthetic Characteristics of Young Populus euphratica and Its Relationship with Environmental Factors

作　　者：马旭 韩炜[1,2] 武胜利 吕婷[1,2] MA Xu;HAN Wei;WU Sheng-li(School of Geographic Science and Tourism,Xinjiang Normal University,Urumqi,Xinjiang 830054;Key Laboratory of Lake Environment and Resources in Arid Areas of Xinjiang/Xinjiang Normal University,Urumqi,Xinjiang 830054)

机构地区：[1]新疆师范大学地理科学与旅游学院,新疆乌鲁木齐830054 [2]新疆干旱区湖泊环境与资源重点实验室/新疆师范大学,新疆乌鲁木齐830054

出　　处：《安徽农业科学》2023年第13期102-108,共7页Journal of Anhui Agricultural Sciences

基　　金：新疆维吾尔自治区科技支撑专项“塔里木河中下游胡杨生态修复研究与示范”(HY-2.3);新疆师范大学“十三五”校级重点学科(地理学)招标课题项目(17SDKD0704);植物地理学课程思政建设实践研究。

摘　　要：[目的]了解幼龄林胡杨在不同灌水量下的光合日变化特性以及幼龄林在T3[38 kg/(株·次)]处理下,净光合速率(Pn)与环境因子光合有效辐射(PAR)、胞间CO_(2)浓度(Ci)、大气温度(Ta)、空气湿度(RH)的关系。[方法]以3、5、7年生胡杨为研究对象,研究3、5、7年生胡杨不同灌水量下的Pn、气孔导度(Gs)、Ci、蒸腾速率(Tr)、水分利用效率(WUE)的日变化有变化。应用相关性分析、逐步回归分析、通径分析研究幼龄林Pn和环境因子之间的差异。[结果]不同水分条件下胡杨幼苗的Pn、Tr日变化曲线呈单峰型,Ci呈“凹单峰”型。3、5、7年生胡杨的Pn日均值在T3处理[29 kg/(株·次)]下达到最大值;在T2、T3处理下3种龄林WUE、Gs波动较大;Tr随着PAR和Ta的升高呈上升趋势,峰值出现的时间因灌水量的影响而不一致。通径分析显示,在T3处理下,各环境因子对Pn都具有显著的影响,其决策系数表现为PAR>RH>Ta>Ci。3年生胡杨PAR为决策变量,RH、Ta为限制变量,5、7年生胡杨PAR为决策变量,Ci和Ta为限制变量。[结论]不同灌溉量对幼龄林胡杨的光合特性有显著影响,适量的灌溉,增加胡杨的Pn,随着林龄的增加,胡杨的光合作用越强。[Objective]To understand the diurnal variation characteristics of photosynthesis of young Populus euphratica under different irrigation and the relationship between net photosynthetic rate(P n)and environmental factors-photosynthetic effective radiation(PAR),intercellular CO_(2) concentration(C i),atmospheric temperature(T a)and air humidity(RH)under T 3 treatment.[Method]Taking 3,5 and 7-year-old Populus euphratica as the research object,the diurnal changes of net photosynthetic rate(P n),stomatal conductance(G s),intercellular CO_(2) concentration(C i),transpiration rate(T r)and water use efficiency(WUE)of 3,5 and 7-year-old Populus euphratica under different irrigation rates were studied;correlation analysis,stepwise regression analysis and path analysis were used to study the differences between P n and environmental factors in young forest.[Result]Under different water conditions,the diurnal variation curves of P n and T r of Populus euphratica seedlings showed a single peak,and the intercellular CO_(2) concentration(C i)showed a“concave single peak”.The daily mean of P n and WUE of 3,5,7-year-old Populus euphratica reached the maximum under T 3 treatment[29 kg/(plant·time)];the transpiration rate showed an upward trend with the increase of PAR and T a.Path analysis showed that under T 3 treatment,all environmental factors had a significant impact on P n,and the order of decision coefficient was PAR>RH>T a>C i.PAR of 3-year-old Populus euphratica is the decision variable,RH and T a are the limiting variables,PAR of 5 and 7-year-old Populus euphratica is the decision variable,C i and T a are the limiting variables.[Conclusion]Different irrigation rates have significant effects on the photosynthetic characteristics of young Populus euphratica.Appropriate irrigation increases the P n of Populus euphratica.With the increase of forest age,the photosynthesis of Populus euphratica is stronger.

关 键 词：不同灌溉量 幼龄胡杨 光合特性 日变化 逐步回归分析 通径分析 

分 类 号：Q948.1[生物学—植物学]