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mixed pine forests
相关语句
  相似匹配句对
     GROWTH OF MIXED STAND OF PINE AND SPRUCE
     欧洲赤松—云杉混交林分生长的研究
短句来源
     The Development of Pine and Oak Mixed Forest and Its Ecologic Function
     松栎混交林的形成及其生态功能研究
短句来源
     and 6. mixed.
     (6)混合型。
短句来源
     MIXED STROKE
     混合性中风
短句来源
     The Characteristics of Photosynthesis of Slash Pine in Different Type of Mixed Forests
     不同混交模式防护林中湿地松的光合特性
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  mixed pine forests
The former mixed pine forests have been almost entirely replaced by aspen/birch forests.
      
Ground layer carbon and nitrogen cycling and legume nitrogen inputs following fire in mixed pine forests.
      


Studies on the spatial construction and distribution of masson pine caterpillar (Dendrolimus punctatus (Walker)) pupae and its parasitic natural enemy guilds for the overwintering generation in three pine forests (i.e., the pure masson pine stands of high and the low damage level, and the Pinus elliottii P.massoniana P.taeda mixed pine forest) were carried out using geostatistics. The results of analysis reveal spatial distributions of pupae and its parasitic natural enemy...

Studies on the spatial construction and distribution of masson pine caterpillar (Dendrolimus punctatus (Walker)) pupae and its parasitic natural enemy guilds for the overwintering generation in three pine forests (i.e., the pure masson pine stands of high and the low damage level, and the Pinus elliottii P.massoniana P.taeda mixed pine forest) were carried out using geostatistics. The results of analysis reveal spatial distributions of pupae and its parasitic natural enemy guilds semivariograms. The semivariogram of pupae was described by spherical model in the mixed pine forest, indicating an aggregated spatial arrangement. In the pure masson pine stands of high damage, semivariogram of pupae was fitted by an exponential model, also indicating an aggregated spatial arrangement. In the low damage stands. semivariogram was linear with 0.423 intercept and a very low slope (0.003814), indicating random or uniform spatial pattern. The semivariograms of parasitic natural emenies guilds in three pine forests were linear with little slope, showing random or uniform distribution. The results and methods are applicable to the temporal and spatial dynamics of insect population and the insect pest ecological control.

应用地学统计学(geostatistics)的原理和方法研究了3种松林中马尾松毛虫越冬代蛹及其寄生天敌群子的空间结构和空间相关性。结果表明,湿地松-马尾松-火炬松混交松林中蛹的半变异函数曲线为球形,其空间格局为聚集型。受害程度高的马尾松纯林中,蛹的半变异函数曲线为指数形,空间格局为聚集型。受害程度低的纯马尾松林中,蛹的半变异函数曲线是一条截距为0.423、斜率为0.003814的直线,表明为随机或均匀型的空间格局。3种松林中蛹的寄生天敌群子的半变异函数均为近乎水平的直线,属随机或均匀型的空间格局。这些结果和方法可应用于种群时空动态格局及自然控制机理的研究。

The growth and development of the massonpine caterpillar, Dendrolimus punctatus Walker was measured after being fed on pine needles from massonpine and slash pine in different pine forests. Shorter developmental period, higher mortality, greater pupation rate, emergence and fecundity were observed in pine caterpillars fed on massonpine needles compared to those fed on slash pine needles. Also, the food consumption and utilization of pine caterpillars fed on massonpine...

The growth and development of the massonpine caterpillar, Dendrolimus punctatus Walker was measured after being fed on pine needles from massonpine and slash pine in different pine forests. Shorter developmental period, higher mortality, greater pupation rate, emergence and fecundity were observed in pine caterpillars fed on massonpine needles compared to those fed on slash pine needles. Also, the food consumption and utilization of pine caterpillars fed on massonpine needles were higher than those fed on slash pine needles. Massonpine caterpillars had greater potential to improve their growth and development and enhance their fecundity and feeding efficiency when fed on massonpine needles or slash pine needles from pure pine forest compared to those fed on needles from mixed pine forest. Moreover, the management implications for pine caterpillars of mixed pine forest are discussed.

为探讨混交林中松树对害虫的生态调控作用机制 ,研究了不同林分类型下马尾松林和湿地松林对马尾松毛虫生长发育的影响。结果表明 ,取食马尾松针叶的马尾松毛虫与取食湿地松针叶的相比 ,其发育历期缩短 ,死亡率降低 ,幼虫及蛹(雌、雄 )重增加 ,化蛹率、羽化率和产卵量均提高 ;且其幼虫的代谢量 (取食量与排泄量 )更大 ,对食物的利用与消耗的各项指标均高。取食不同林分类型下的同一种松树 (马尾松或湿地松 )针叶的马尾松毛虫 ,以取食纯林松针的幼虫生长发育更快 ,死亡率更低 ,化蛹率、羽化率和产卵量更高 ,对食物的利用、转化和消耗率更强。混交林中的松针不利于马尾松毛虫的生长发育和种群增长

The population dynamics of Dendrolimus punctatus was analyzed by investigation of the larva occurrence numbers,damaged area and percent of trees with larva in five different pine forest from 1992 to 2001.The results showed that the greatest larva numbers,highest infest,and shortest outbreak period of D.punctatus were occurred in pure pine forest,while less in the mixed pine forest with cedar,and the least in the mixed pine forest with broad-leaved trees.

通过对1992~2 0 0 1年5种不同混交林型的马尾松林内各代幼虫发生量,受害面积和有虫株率的系统调查,研究了各种不同林型的松林对马尾松毛虫种群动态的影响。结果表明,不同树种混交的马尾松林对马尾松毛虫的种群动态有较大的影响。马尾松毛虫在马尾松纯林中发生量多,为害最严重,暴发周期最短;在与杉木等混交的马尾松林中发生次之;而在与阔叶树混交的马尾松林中平均每株虫口数少,发生与危害率及有虫株率均较其它林型小,不易引起松毛虫暴发为害。

 
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