湿地松粉蚧为害对湿地松生长的影响

    EFFECTS OF Oracella acuta (HOMOPTERA:PSEUDOCOCCIDAE) ON THE GROWTH OF Pinus elliottii

    • 摘要: 根据林木被害状划分湿地松的受害等级,并在此基础上测定了湿地松受害后的生长情况。结果显示,严重受害林分主梢、侧梢生长分别下降23.7%和25.8%,严重被害木树高,胸径、当年生地叶鲜重、材积生长分别下降26.8%、30.3%、47.6%和335%,对粉蚧侵入后连续5年的材积测定表明,第2年和第3年材积生长显著下降,第5年受害较轻,5年材积累计损失3.964m^3/hm^2。

       

      Abstract: Studied the influence of the loblolly mealybug, Oracella acuta , on the growth of the slash pine, Pinus elliottii , in Guangdong province.The damage degree of the slash pine is divided by the symptom of damaged pine.The results showed that growths of height and lateral shoots were reduced by 23.7% and 25.8% respectively in heavily damaged stands .Height growth,diameter growth at breast height,fresh weight of one year old needles,volume growth of severely damaged trees declined by 26.8%,30.3%,47.6% and 33.5% respectively. In the heavy damaged stands which have been infested by O.acuta for five years, the results showed that the volume of damaged trees dropped within five years in which the second and third year had great difference compared with the contrast, and the growth of the slash pine was less affected in the fifth year. The total volume loss of damaged stands amounted to 3 964 m 3 per hectare during the five years.

       

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