Lasiognatha cellifera was one of the main defoliators for the Aegiceras corniculatum which was main tree of mangrove, and identified as new record of species in China L. cellifera had 7 generations per year in Zhangzh...Lasiognatha cellifera was one of the main defoliators for the Aegiceras corniculatum which was main tree of mangrove, and identified as new record of species in China L. cellifera had 7 generations per year in Zhangzhou area, Fujian Province and overwintered as pupa in the rolled leaf. Adult moth emerged in last-May, mating and laying egg on back of leaf soon. Egg period lasted 5d, larvae period lasted 13～17d, pupa periods lasted about 6d but overwinter-pupa lasted about 150d, adult moth life-span was 4～5d. The periods were related to the diversification of temperature, and the periods decreased with the increase of temperature. A. corniculatum in the front of seashore were harmed seriously for the reason that they growed weakly and L. cellifera was not adept in flying. Protecting natural enemies such as bird, parasitism etc., alluring adult moth, spraying Dimilin Ⅲ in 2 000 concentration when it occurred seriously will control L. cellifera effectively.展开更多
Latoia lepida is one of the main defoliators for the mangrove forest. The survey in the forest revealed that L.lepida principally distributed on the middle and upper parts of crown, the position soaked by seawater for...Latoia lepida is one of the main defoliators for the mangrove forest. The survey in the forest revealed that L.lepida principally distributed on the middle and upper parts of crown, the position soaked by seawater for short time gradually decreased from the internal beach to the external beach, the average injured percentage was 46.3% on the internal beach (high tide position), and the average injured percentage was only 13.8% on the external beach (middle tide position). The seawater soak-resistant experiment indicated that the influence of different soak times existed the extremely marked different on L.lepida survival rate, the population mortality rate increased with the increase of soaking time after soaking for more than 4 h, the population mortality reached the peak at the time of soaking for 8 h, and then the population survival rate stabilized to a certain level. The difference was not obvious among various-generation larval adversity resistance, the difference was evident among various-instars larval adversity resistance, the adversity resistance of larvae on seawater soaking was the main reason for the larval population distribution law and the large outbreak of L.lepida in the forest.展开更多
文摘Lasiognatha cellifera was one of the main defoliators for the Aegiceras corniculatum which was main tree of mangrove, and identified as new record of species in China L. cellifera had 7 generations per year in Zhangzhou area, Fujian Province and overwintered as pupa in the rolled leaf. Adult moth emerged in last-May, mating and laying egg on back of leaf soon. Egg period lasted 5d, larvae period lasted 13～17d, pupa periods lasted about 6d but overwinter-pupa lasted about 150d, adult moth life-span was 4～5d. The periods were related to the diversification of temperature, and the periods decreased with the increase of temperature. A. corniculatum in the front of seashore were harmed seriously for the reason that they growed weakly and L. cellifera was not adept in flying. Protecting natural enemies such as bird, parasitism etc., alluring adult moth, spraying Dimilin Ⅲ in 2 000 concentration when it occurred seriously will control L. cellifera effectively.
文摘Latoia lepida is one of the main defoliators for the mangrove forest. The survey in the forest revealed that L.lepida principally distributed on the middle and upper parts of crown, the position soaked by seawater for short time gradually decreased from the internal beach to the external beach, the average injured percentage was 46.3% on the internal beach (high tide position), and the average injured percentage was only 13.8% on the external beach (middle tide position). The seawater soak-resistant experiment indicated that the influence of different soak times existed the extremely marked different on L.lepida survival rate, the population mortality rate increased with the increase of soaking time after soaking for more than 4 h, the population mortality reached the peak at the time of soaking for 8 h, and then the population survival rate stabilized to a certain level. The difference was not obvious among various-generation larval adversity resistance, the difference was evident among various-instars larval adversity resistance, the adversity resistance of larvae on seawater soaking was the main reason for the larval population distribution law and the large outbreak of L.lepida in the forest.
文摘通过滨海木麻黄基干防护林带的小气候效应及梯度变化规律的定位观测研究,结果表明:林带内的月平均温度与空旷地相比平均降低0.7℃,年平均气温的垂直梯度变化为林冠上部最高,1.5m 处次之,林冠中部最低,变化梯度为0.4℃;空旷地空气的绝对湿度均高于带内。林带内外平均相对湿度相差甚微,仅为0.8%,湿度的垂直梯度变化为林冠中部最大,林冠上部次之,而以林内近地层为最小,绝对湿度的变化梯度为0.6 mb,相对湿度的变化梯度为3.1%。林带土壤的年平均温度随土壤深度的增加而降低,冬春季节土壤温度随深度的增加而降低,至10 cm 后土壤温度又随深度而增加,夏秋季节土壤温度随深度的增加而一直降低。晴天照度均明显高于阴天,晴天空旷地的照度是阴天的2.6倍,照度在林带内呈明显的梯度变化,林冠层中部最小,林带下部次之,而在林冠上部照度最大。
