摘要
为了解氮梯度加载对闽楠幼苗生长及叶绿素荧光特性的影响,对2年生闽楠幼苗进行模拟试验。在7个氮水平:N0(0 g·m^(-2)·a^(-1)1)、N1(5 g·m^(-2)·a^(-1)1)、N2(10 g·m^(-2)·a^(-1)1)、N3(15 g·m^(-2)·a^(-1)1)、N4(20 g·m^(-2)·a^(-1))、N5(25 g·m^(-2)·a^(-1)1)、N6(30 g·m^(-2)·a^(-1)1)培养6个月后,测定闽楠幼苗的生长指标和叶绿素荧光参数变化。结果表明:随着氮浓度增加,闽楠幼苗苗高、地径和全株生物量均呈现增→减→增的变化规律,苗高在N1时达到峰值(142.41 cm)、地径和全株生物量在N2时达到峰值(15.31 mm、192.22 g),较对照处理分别提高48.33%、28.55%、114.58%;不同氮梯度加载处理一定程度促进了闽楠幼苗叶片叶绿素总量的增长,其中N2、N3组幼苗叶绿素总量显著高于N0(P<0.05),而N6组幼苗叶绿素总量值显著低于N0(P<0.05);随氮强度增加,闽楠的最大光化学效率(F_v/F_m)、潜在光化学活性(F_v/F_o)、实际光化学效率(Yield)呈现增→减→增的变化趋势,而光化学猝灭系数(q_P)、非光化学猝灭系数(qN)呈现减→增→减的变化趋势,从叶绿素荧光参数的角度出发,N3～N4为最佳施氮浓度区间,适当增加供氮水平可显著提高闽楠幼苗的光合效率。
This study was aimed at understanding the effects of nitrogen gradient loading on the growth and chlorophyll fluorescence characteristics of Phoebe bournei seedlings through a simulated experiment on two-year-old P. bournei seedlings under seven nitrogen levels, N0 (0 g · m^-2 · a^-1 ), N1 (5 g · m ^-2 · a^-1 ), N2 (10 g · m ^-2 · a^-1 ), N3 (15 g · m ^-2 · a ^-1 ), N4 (20 g · m^-2 · a ^-1 ), N5 (25 g · m ^-2 · a ^-1 ), and N6 (30 g · m^-2 · a^-1 ) after 6 months of planting. The results showed that with an increase in nitrogen concentration, seedling height, ground diameter, and whole plant biomass showed an increase-decrease-increase pattern. Seedling height reached the maximum at N1 (142.41 cm), ground diameter and whole plant biomass reached the maximum at N2 (15.31 mm and 192.22 g, respectively ), and these growth indices increased by 48.33%, 28.55%, and 114.58%, respectively, compared with the control group. Different nitrogen gradient loading treatments promoted an increase in total chlorophyll content in the leaves of P. bournei seedlings;the total chlorophyll content in leaves of the N2 and N3 groups was significantly higher and that of the N6 group was significantly lower than in the leaves of the N0 group ( P <0.05). With an increase in nitrogen intensity, the maximum photochemical efficiency ( F v/ F m), potential photochemical activity ( F v/ F o), and actual photochemical efficiency (Yield) of P. bournei seedlings showed an increase-decrease-increase trend, and the photochemical quenching coefficient ( q P) and nonphotochemical quenching coefficient ( q N) showed a decrease-increase-decrease trend. From the perspective of chlorophyll fluorescence parameters, N3 and N4 were the optimum concentration ranges of N for P. bournei seedlings;the photosynthetic efficiency of P. bournei seedlings could be significantly improved by an appropriate increase in nitrogen supply.
作者
李彬
洪滔
陈欣凡
马义龙
苏少川
吴承祯
LI Bin;HONG Tao;CHEN Xinfan;MA Yilong;SU Shaochuan;WU Chengzhen(College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China;Key Lab for Forest Ecosystem Processes and Management in Fujian Province, Fuzhou, Fujian 350002, China;Jianyang Forestry Adiministration of Nanping, Nanping, Fujian 354200, China;College of Ecology and Resources Engineering, Wuyi University, Wuyishan, Fujian 354300, China)
出处
《森林与环境学报》
CSCD
北大核心
2019年第3期241-247,共7页
Journal of Forest and Environment
基金
国家"十三五"重点研发计划项目(2017YFD0601304)
福建农林大学科技创新专项基金项目(CXZX2016045)
关键词
氮梯度加载
闽楠
幼苗生长
叶绿素荧光参数
nitrogen gradient loading
Phoebe bournei
seedling growth
chlorophyll fluorescence parameter
