土水肥耦合下五叶地锦光合日变化特征

Diurnal Variation Characteristics of Photosynthesis in Parthenocissus quinquefolia under Soil Water Fertilizer Coupling

矿山岩质边坡植被恢复困难,为探究土水肥耦合对五叶地锦光合特征的影响,试验地点选在石家庄市鹿泉区一废弃石灰岩采石场,以五叶地锦幼苗为研究对象,采用L_(16)(4)^(5)正交表进行3因素4水平设计,测定其光合指标及光合有效辐射(PAR)、温度(Ta)、空气相对湿度(RH)、大气CO_(2)浓度(Ca)等环境因子日变化参数,分析土水肥耦合下五叶地锦光合特征与环境因子的关系。结果表明:(1)Pn、E、WUE值在W_(1)N_(1)耦合下与同一土层厚度下的其他处理存在差异,随着土层厚度增加,水分减少,Pn、E、WUE、gs值减小;(2)Pn、WUE、CO_(2)值在S_(1)N_(1)耦合下与同一水分条件下的其他处理存在差异,随着水分减少,Pn、E减小,与土层厚度和施肥量无关,WUE、gs值在低土层厚度和高施氮耦合下增加,CO_(2)值在中度土层厚度和无氮肥耦合下增加。(3)Pn、WUE、gs、CO_(2)值在S_(1)W_(1)耦合与同一施氮条件下的其他处理存在差异,随着施肥量的增加,Pn、E、gs值在高土层厚度和高水分耦合下增加;WUE、Ci值在低土层厚度和低水分耦合下增加。(4)Pn、E、gs与PAR呈显著正相关;PAR与Ta、Ta与RH、Ca与RH呈显著相关。综合表明,合理的土水肥耦合能促进五叶地锦的生长及光合作用,且在S_(4)W_(1)N_(4)处理下耦合效果最佳。

It is difficult to restore the vegetation of rocky slopes in mines,in order to investigate the effect of soil-water-fertiliser coupling on the photosynthetic characteristics of Parthenocissus quinquefolia,the test site was selected in an abandoned limestone quarry in Luquan District,Shijiazhuang City,and the seedlings of Parthenocissus quinquefolia were used as the research objects,and a three-factor,four-level design using L_(16)(4)^(5) orthogonal table was carried out to measure the photosynthetic indexes and the photosynthetically active radiation(PAR),Temperature(Ta),relative humidity(RH),atmospheric CO_(2)concentration(Ca)and other environmental factors were measured to analyse the relationship between the photosynthetic characteristics and environmental factors under soil-water-fertilizer coupling.The results showed that(1)Pn,E and WUE values differed from other treatments under W_(1)N_(1) coupling with the same soil thickness and decreased with increasing soil thickness and decreasing moisture;(2)Pn,WUE and CO_(2)values differed from other treatments under S1N1 coupling with the same moisture condition,and decreased with decreasing moisture,and were related to soil thickness and fertiliser application,WUE,gs values increased under low soil thickness and high N application coupling,and CO_(2)values increased under moderate soil thickness and no N fertiliser coupling.(3)Pn,WUE,gs,and CO_(2)values differed in the S_(1)W_(1) coupling from other treatments under the same nitrogen application condition,and with increasing fertiliser application,Pn,E,and gs values increased at high soil thickness and high moisture coupling;WUE and Ci values increased at low soil thickness and low moisture coupling.(4)Pn,E,gs were significantly and positively correlated with PAR;PAR was significantly correlated with Ta,Ta with RH,and Ca with RH.Comprehensively,it showed that reasonable soil-water-fertiliser coupling could promote the growth and photosynthesis of Parthenocissus quinquefolia,and the coupling effect was best under the S_(4)W_(1)N_(4) treatment.