论文部分内容阅读
1.冻害后植株表现症状去冬今春武汉出现干冻,油橄榄植株冻后症状表现不一,冻害症状出现的时间也迟早不一。通过现场观察有如下几种不同表现: (1)不抗寒品种的叶片受冻后,有的很快脱落,有的在lO天以后才开始慢慢落叶。 (2)叶片基本上没有受冻,一年生小枝有细小的皮裂,整个枝条皮裂不成线,芽多数冻死。 (3)大枝或主杆受冻后,皮呈褐色的块状或环状冻块,春暖后,冻块症状表现尤为明显,由于组织冻死,皮层失水,冻块呈凹形。 (4)冻后有一部分主枝和主杆,虽皮层外部仍呈现绿色,但形成层和木质部已变
1. Frost damage the performance of the plant symptoms Winter to spring and winter this year, Wuhan appears frozen, cold symptoms of olive plant performance, frost damage symptoms appear sooner or later. Observed by the scene there are several different performance: (1) not cold-resistant varieties of leaves after freezing, some quickly fall off, and some began to slowly decay after 10 days. (2) The leaves are basically not frozen, the annual branchlets have small peels, the entire branch of the skin does not break, the majority of buds freeze to death. (3) After the big branch or the main rod is frozen, the skin is brown or lumpy block. After the spring is warm, the symptom of the frozen block is especially obvious. Because the tissue is frozen to death, the cortex is dehydrated and the frozen block is concave. (4) There are some main branches and main rods after freezing, although the outer layer of the cortex still appears green, but the formation layer and the xylem have been changed