马尾松毛虫越冬代幼虫空间分布格局研究

根据2008年广西沙塘林场马尾松毛虫越冬代幼虫虫口密度,采用分布型指数及回归模型法探讨了广西沙塘林场马尾松毛虫越冬代幼虫空间分布格局。结果表明,马尾松毛虫越冬代幼虫呈聚集分布,分布的基本成分为个体群。列出了林间调查最适抽样数及序贯抽样分析表,提出了马尾松毛虫越冬幼虫防治的上下限指标,为害虫综合治理提供了一定的理论依据。

马尾松毛虫越冬代幼虫空间分布格局研究(英文)

Based on the data of mean population density of overwintering larvae of Dendrolimus punctatus in Shatang forest farm in Guangxi Province, the spatial pattern of overwintering larva of D. punctatus were analyzed by the distribution index and regression model method. The results showed that the spatial pattern of overwintering larvae of D. punctatus assumed the aggregation pattern, the basic component of distribution was individual group. The optimal sampling number of forest survey and the sequential sampling analysis were presented, and the upper and low bound index for controlling D. punctatus were put forward to provide certain theoretical basis for integrated pest management.

桂中沙塘聚煤盆地大埔背斜构造对天然气储存的制约

为了桂中沙塘聚煤盆地的大埔背斜开展地下储气库项目选址和地质评价工作,对大埔背斜地层、形态和两翼断裂进行野外调查与室内综合分析。大埔箱状背斜褶皱,转折端平缓宽阔,使得储层三维空间规模相应较大。两翼的走向逆断层没有破坏背斜主体,砂岩储层原始容气率与渗透率低,燕山期强烈的南北向挤压作用,产生剪性节理,平行层理裂缝发育为主要容气构造、垂直层理裂缝较小为次要容气构造,喜马拉雅期差异性升降产生张性节理,连通剪性节理,为导气构造;导致孔隙率小于10%的储层,渗透率达到47.7×10-3μm 2,提升了储层品质;背斜高点虚脱形成气顶甜点区。盖层为泥页岩,矿物成分主要为水云母,极易压实,封闭条件良好。大埔背斜可能属于优质储气构造。