马尾松诱导化学物质变化的时空动态

研究了受害程度不同的马尾松针叶内诱导化学物质在时间序列上的变化和局部受害后空间序列上的变化。结果发现：受害马尾松针叶内次生代谢物质（单宁、酚类物质）含量随时间的变化而不断上下波动，先增加，后逐渐降低，恢复到原来的水平；营养物质（可溶性糖）含量先降低，后逐渐恢复到原来水平。反映了马尾松受害后的应激反应是一种快速、间断、被调节的过程。危害程度的强调对马尾松诱导化学物质的变化有一定的影响。中度的危害（针叶损失50％）所诱导产生的次生物质最多，轻度（针叶损失25％）或重度（针叶损失75％）的危害所诱导产生的次生代谢物质较低。以7年生（共5个轮枝）的马尾松作为实验材料，对第3轮枝进行剪叶75％，在空间序列上，观察其余各轮枝松针内化学物质的变化。发现第3轮枝受害后马尾松其余各轮针叶内也产生诱导化学物质含量变化，并且因轮枝部位的不同，其诱导产生的变化也不相同。说明松针所产生的诱导化学物质含量的变化是全株性的、异质性的。

Spatial-tempetial trends of induced chemical change in pine Pinus massoniana

Experiments were carried out to study induced chemical change in the pine needles damaged to different degrees with time and in space after partial plant damage.The contents of secondary metabolites (Tannins and phenolics) in damaged pine constantly fluctuaed with time,which increased at first and descended later,then returned to normal.In turn,the content of soluble sugar decreased at first and then returned to normal.Also,the degree of damage effected on the induced chemical change. The more secondary metabolites in moderately damaged pines (loss needles 50%) than that in both slight damaged pines (loss needles 25%) and serious damaged pines (loss needles 75%) were induced.On basis of seven year pine P.massoniana (five round branches),chemical change in needles of round branch 1,2,4,5 were observed after 75% needles of third round branch was clipped.The content of nutrients and secondary metabotiles in different round branches differed significantly.Induced chemical changes varied,depending on positions of round branch.The changes occurred in whole plant heterogenously.