文献类型：期刊文献

中文题名：不同磷浓度下马尾松幼苗高生长和光合特征的变化

英文题名：Variations on the Height Growth and Photosynthetic Characteristics of Pinus massoniana Lamb.Seedlings along a Soil Phosphorus Content Gradient

作者：徐瑾[1] 雷蕾[1,2] 曾立雄[1,2] 刘娅惠[1] 万一[1] 倪妍妍[1,3] 简尊吉[1] 邓秀秀[4] 张佳佳[1] 肖文发[1,2]

第一作者：徐瑾

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]南京林业大学南方现代林业协同创新中心,江苏南京210037;[3]中国科学院武汉植物园,湖北武汉430074;[4]中国林业科学研究院华北林业实验中心,北京102300

年份：2023

卷号：36

期号：2

起止页码：91-100

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

基金：中央级公益性科研院所基本科研业务费专项资金“马尾松生长对低磷环境的响应机制”(CAFYBB2021QD002)。

语种：中文

中文关键词：马尾松;磷;光合作用;生长

外文关键词：Pinus massoniana;phosphorus;photosynthesis;growth

分类号：S791.248

摘要：[目的 ]研究马尾松幼苗在不同磷浓度下的高生长和光合特征响应,揭示马尾松对低磷环境的适应机制,为马尾松林经营管理和精准的生长模拟预测提供试验依据。[方法 ]以两年生马尾松幼苗为试验材料,培养基质以有效磷含量2.325mg·kg^(-1)为对照组(CK),另设无磷(0AP)、 1/8倍磷(1/8AP)、 1/4倍磷(1/4AP)、1/2倍磷(1/2AP)、2倍磷(2AP)和4倍磷(4AP)等磷浓度梯度,经过2021年5月—11月的培养,分析马尾松幼苗高生长和光合特征参数的差异。[结果 ]马尾松幼苗株高的相对生长增量(RHI)和光合参数受到生长时间和磷浓度的影响。5—6月的RHI显著高于7—8月和9—10月,4AP条件下的RHI显著高于1/8AP。株高相对生长速率与磷浓度显著正相关(P<0.05),且随磷浓度的升高而线性增高。净光合速率(Pn)、气孔导度(Gs)、胞间CO_(2)浓度(Ci)和蒸腾速率(Tr)均受到磷浓度、生长时间及其交互作用的显著影响(P<0.05),且各光合参数值均在7—9月最高。Pn和Ci与幼苗RHI显著正相关;生长时间对RHI、Pn、Gs和Ci具有促进作用。[结论 ]马尾松幼苗的高生长和光合特征参数在不同磷浓度下差异显著,马尾松幼苗在低磷环境下通过调节光合作用和高生长动态变化,对低磷环境产生了一定适应机制。
[Objective]To study the response of Pinus massoniana seedlings of height growth and photosynthetic characteristics under different phosphorus concentrations,reveal the adaptation mechanism of P.massoniana to low phosphorus environment,and provide experimental basis for the management and accurate growth simulation prediction of P.massoniana forest.[Method]From May 2021,to November 2021,two-year-old seedlings of P.massoniana were planted in 7 different soil phosphorus concentrations,including control group(2.325 mg·kg^(?1),CK),no phosphorus group(0AP),with an eighth of CK(1/8AP),a quarter of CK(1/4AP),a half of CK(1/2AP),two times of CK(2AP),and four times of CK(4AP);and then the growth and photosynthetic parameters were tested.[Result]Relative height increment(RHI)and photosynthetic parameters of P.massoniana seedlings were affected by growing times and soil phosphorus concentrations.RHI during from May to June(RHI5-6)was higher than that from July to August(RHI7-8)and September to October(RHI9-10).RHI5-6 of 4AP was significantly higher than that of 1/8AP.Relative growth rate of seedlings was positively correlated with soil phosphorus concentrations(P<0.05),and linearly increased with phosphorus concentrations.Net photosynthetic rate(Pn),conductance to H2O(Gs),intercellular CO_(2) concentration(Ci),and transpiration rate(Tr)were significantly affected by soil phosphorus content,growing time and their interaction.And all of them reached their peak in July to September.Pn and Ci were positively correlated with RHI.Growing time had a promoting effect on RHI,Pn,Ci and Gs.[Conclusion]The height growth and photosynthetic parameters of P.massoniana seedlings are significantly affected by soil phosphorus concentrations.P.massoniana seedlings have a special adaptive mechanism to the low-phosphorus environment by regulating photosynthesis and the dynamic changes of height growth.