摘要
以10个不同杉木无性系幼林叶片为研究对象,在对研究地气候因子进行分析基础上,采用微波石蜡快速切片法制作叶片解剖结构,通过观测比较叶片8项解剖结构指标的差异规律,研究不同杉木无性系叶片解剖结构在大气增温背景下的响应特征。结果表明:(1)研究地2020年度夏季气温呈先上升后下降的趋势,降水量变化与之相反,呈现出明显的高温干旱现象。(2)不同杉木无性系叶片解剖结构相似,叶肉组织分化为栅栏组织和海绵组织,为典型异面叶;解剖结构指标除下表皮厚度外,其余指标在无性系间呈现出不同程度的改变,表现出对大气增温响应的形态可塑性差异。(3)相关性分析结果表明,叶片解剖结构指标之间存在一定自相关关系;气候因子中,月平均气温与栅栏组织呈极显著正相关关系(P<0.01),月均降水量与栅栏组织、海绵组织、栅海比均呈极显著正相关关系(P<0.01)。(4)根据主成分分析结果,筛选出海绵组织、栅栏组织、叶片厚度、表皮组织和角质层为表征杉木叶片解剖结构的典型指标,反映出在大气增温背景下杉木叶片解剖结构变化特征以抵抗强烈光照和减少水分散发的特性。(5)不同杉木无性系叶片可塑性指数均值排序结果为W2>P11>S4>P32>P41>P17>P18>S22>S23>洋061,表明不同杉木无性系对大气增温的生态适应性与之相对应。综上可见,不同杉木无性系对环境的适应能力存在差异,叶片具有较强的形态可塑性变化,当气温改变时,杉木可通过叶片解剖结构调整以应对不断增加的大气温度带来的高温干旱复合逆境胁迫,未来应充分重视气候变化对杉木人工林生长发育的影响。
Taking the needles of ten different Chinese fir clones in the young plantations as the object, the needle anatomical structures were made by microwave paraffin rapid section method, based on the analysis of climatic factors in the study area. By observing and measuring eight anatomical structure indexes of the needle samples, including upper epidermis cutical thickness, upper epidermis thickness, lower epidermis cutical thickness, lower epidermis thickness, palisade tissue thickness, spongy tissue thickness, leaf thickness, and vascular bundle thickness, the response characteristics of needle anatomical structure of different Chinese fir clones under the background of atmospheric warming were studied. The results show that:(1)the summer temperature of the study area increased firstly and then decreased in 2020. On the contrary, the change of precipitation showed obviously high temperature and drought.(2)The needle anatomical structures of different Chinese fir clones were similar. The mesophyll tissue differentiated into palisade tissue and spongy tissue, which were typical heterophyllous leaves. Except for the thickness of the lower epidermis, the other anatomical structure indexes showed different degrees of change among clones, showing morphological plasticity differences in response to atmospheric warming.(3)The results of correlation analysis showed that there was a certain correlation between anatomical structure indexes. Among the climatic factors, the monthly average temperature was significantly positively correlated with palisade tissue(P< 0.01), and the monthly average precipitation was significantly positively correlated with palisade tissue, spongy tissue and ratio of palisade tissue to spongy tissue(P<0.01).(4)According to the results of principal component analysis, sponge tissue, palisade tissue, needle thickness, epidermal tissue and cuticle were selected as the typical indicators to characterize the anatomical structure of Chinese fir needles, reflecting the characteristics of the anatomical structure change of Chinese fir needles under the background of atmospheric warming to resist strong light and reduce water emission.(5)The order of leaf plasticity index of different Chinese fir clones was W2>P11>S4>P32>P41>P17>P18>S22>S23>Yang061, which was similar to the ecological adaptability of different Chinese fir clones under atmospheric warming environment. In conclusion, there are differences in the environmental adaptability among different of Chinese fir clones, and the leaves have strong morphological plasticity changes. When the temperature changes, Chinese fir can respond to the combined stress of high temperature and drought caused by increasing atmospheric temperature through the anatomical structure adjustment of leaves. The future should pay full attention to the impact of climate change on the growth and development of Chinese fir plantation.
作者
李林鑫
陶长铸
林景泉
李明
马祥庆
吴鹏飞
LI Linxin;TAO Changzhu;LIN Jingquan;LI Ming;MA Xiangqing;WU Pengfei(Chinese Fir Engineering Technology Research Center qf State Forestry Administration,College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Fujian Shanghang Baisha Forestry Farm,Shanghang 364205,China)
出处
《生态学报》
CAS
CSCD
北大核心
2022年第20期8385-8397,共13页
Acta Ecologica Sinica
基金
国家自然科学基金项目(31971674,31870614)
福建省自然科学基金重点项目(2020J02029)
福州市科学技术局科技计划项目(2021-P-035)。
关键词
杉木
气候变化
针叶解剖结构
可塑性响应
变异系数
Cunninghamia lanceolata
climate change
needle anatomical structure
plasticity in response
variation coefficient
