摘要
抗寒锻炼期间对11年生樟子松(Pinus sylvestris L.var.mongolica Litv.)幼树枝叶进行人工低温处理,以1年生针叶和茎的相对电导率作变化曲线,结合Logistic方程计算樟子松针叶和茎的低温半致死温度(LT50),以此评价其抗寒性;并测定了针叶和茎的干物质含量及针叶最大光化学效率(Maximum photochemical efficiency of photosystem,Fv/Fm),对干物质含量和Fv/Fm与抗寒性的相关性进行分析。结果表明:①随着抗寒锻炼的进行,樟子松针叶和茎的抗寒性逐步增强,抗寒锻炼初期的9月针叶的抗寒性强于茎的抗寒性,而抗寒性达最强的3月茎的抗寒性强于针叶的抗寒性;②这些器官的干物质含量与抗寒性为多项式相关;针叶的荧光参数Fv/Fm与抗寒性为线性相关。
Eleven-year-old Pinus sylvestris L. var. mongolica Litv. saplings were sampled with artificial low-temperature treatments during frost hardening. To measure the frost hardiness of needles and stems, the relative electrolyte leakage variation curves of one-year-old needles and stems were measured and combined with logistic equation to calculate their semi-lethal low temperatures. The dry matter contents of needles and stems, and the maximum photochemical efficiency of photosystem Fv/Fm were measured in order to find their correlations with frost hardiness. The results indicated that： （~） Frost hardiness of needles and stems in P. sylvestris L. var. rnongolica Litv. saplings increased during frost hardening. Frost hardiness in needles was hardier than that of stem in September during the early stage of frost hardening; while in the end of frost hardening in March the frost hardiness in stems was hardier than that of needles.The correlation between dry matter contents of needles and stems and frost hardiness had polynomial equation relationship; the Fv/Fm of needles correlated linearly with frost hardiness.
出处
《河北农业大学学报》
CAS
CSCD
北大核心
2013年第1期46-49,共4页
Journal of Hebei Agricultural University
基金
国家林业局948项目(2011-4-08)
关键词
抗寒性
电导法
含水量
半致死温度
叶绿素荧光
frost hardiness
electrical conductivity
water content
semi-lethal temperature
chlorophyll fluorescence
