Vertical Distribution of Monochamus monochamus in Infected Bursaphelenchus xylophilus Tree Trunks
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摘要:
目的 松褐天牛是典型的钻蛀性害虫,林间天牛种群密度调查及其防治极为困难。了解松褐天牛在松材线虫病枯死树上的垂直分布情况,旨在为松褐天牛的林间虫情调查和危害程度估计提供一种方便快捷的简易方法。 方法 采用随机抽取、逐株逐段调查统计法,于2015-2017年在江西省赣州市峰山国家森林公园系统调查了松褐天牛在松材线虫病死树上的产卵刻槽、侵入孔和羽化孔的垂直分布并分析了它们间的数量关系情况。 结果 松褐天牛产卵刻槽,在株高 < 8 m时,主要分布在树干中段,占全株的46.07%,而株高≥8 m时,主要分布在树干下段,占53.687%;幼虫侵入孔和成虫羽化孔在病树上的数量分布:树干中段>下段>上段,中段均占50%左右;产卵刻槽、侵入孔和羽化孔的数量与树干高度呈正相关关系。伐桩上没有发现产卵刻槽,且侵入孔、羽化孔数量也极少,分别占总株侵入孔数、羽化孔数的0.54%、0.29%。树干下段虫孔数量(即下段产卵刻槽、侵入孔和羽化孔数量)与整株羽化孔数量均呈极显著相关关系,但根据下段侵入孔数量来推算整株羽化孔的数量更为准确、可靠。 结论 根据下段侵入孔数量来推算整株羽化孔的数量,是松褐天牛林间虫情调查的一种方便快捷方法。 Abstract:Objective Population density of the typical borer pest, Monochamus alternatus, in the Bursaphelenchus xylophilus forest was investigated to seek effective means for detecting and controlling the difficult-to-manage infestation. Method The vertical distributions of oviposition grooves, invasion (entry) and eclosion (exit) holes of M. alternatus inside the infected tree trunks were obtained by systematic random sampling and tree-by-tree, section-by-section close observation on evidence of infestation on trees at Fengshan National Forest Park in Ganzhou, Jiangxi from 2015 to 2017.The data were analyzed for correlations among them. Result The oviposition tracks left on the trunks by M. monochamus constituted 46.07% of the total in the section half way above ground level on a tree less than 8 m high. For the trees equal or taller than 8 m, 53.687% of the marks were found in the lower part of a trunk. The quantitative distribution of larval invasion and adult eclosion holes on the diseased trees ranked in the order of middle section > lower section > upper section. Of which, approximately 50% were in the middle section of a tree trunk. The total number of oviposition grooves and invasion and eclosion holes correlated with tree height. No oviposition groove was observed on dead tree stumps, and few invasion and eclosion holes were found which amounted to merely 0.54% and 0.29%, respectively, of the total. The number of boreholes (i.e., the combined total of oviposition grooves and invasion and eclosion holes) in the lower part of the trunk significantly correlated with the number of eclosion holes in the entire tree. However, it was more accurate and reliable to estimate the total number of eclosion holes on a tree by using the count of invasion holes in the lower section. Conclusion Using the invasion hole count in lower trunk section to estimate the total number of eclosion holes on a infested tree was considered a convenient, quick and reliable way for studying the M. monochamus infestation in a B. xylophilus forest. -
表 1 松褐天牛虫孔在松材线虫病疫木上的分布
Table 1. Distribution of M. alternatus boreholes on infected pine trees
项目
Item株高
Height/m伐桩
Stumps(5 cm)下段
Lower segment中段
Middle segment上段
Upper segment合计
Total产卵槽数/个
Number of oviposition slots< 8 0 20.55±16.18Bb 34.97±36.51 A b 20.39±11.73B a 75.90±62.41 b ≥ 8 0 81.38±47.97Aa 50.47±22.93ABa 19.75±9.72 B a 151.59±56.24a 侵入孔数/个
Number of intrusive holes< 8 0.66±0.83 a 9.29±6.91 C b 15.84±10.35 A b 11.52±4.10 B a 36.65±19.69 b ≥ 8 0.19±0.40 b 35.03±19.77Ba 49.88±34.27 A a 18.88±13.86C a 103.81±58.62a 羽化孔数/个
Number of eclosion holes< 8 0.29±0.46 a 5.45±3.71 Cb 9.39±4.96 A b 7.25±3.03 B b 22.10±10.27 b ≥ 8 0.10±0.30 b 18.00±9.75 Ba 26.31±16.85 A a 11.03±7.57 BCa 55.34±28.02 a 注:表中同一行不同大写字母表示差异显著(P < 0.05),相同项目下的每一列不同小写字母表示差异显著(P < 0.05);表中数字为“平均值±标准差”。
Note:Different capital letters on a same row indicate significant differences (P < 0.05). Different lowercase letters on a same column indicate significant differences (P < 0.05). Datas are mean±SD.表 2 产卵刻槽、侵入孔和羽化孔数量间的关系分析
Table 2. Correlations among numbers of oviposition grooves, invasion and eclosion holes on diseased tree trunks
株高
Height/m项目
Item比例
Proportion相关系数
RP值
Sig.回归方程
Regression equation< 8 产卵刻槽数x1与侵入孔数x2
No of oviposition scars (x1) and No of entrance holes (x2)1:0.483 0.918 0.000 x2=0.290x1 + 14.665 产卵刻槽数x1与羽化孔数x3
No of oviposition scars (x1) and No of exit holes (x3)1:0.291 0.720 0.000 x3=0.119x1 + 13.100 侵入孔数x2与羽化孔数x3
No of entrance holes (x2) and No of exit holes (x3)1:0.603 0.911 0.000 x3=0.475x2 + 4.677 ≥ 8 产卵刻槽数x4与侵入孔数x5
No of oviposition scars (x4) and No of entrance holes (x5)1:0.685 0.848 0.000 x5=0.884x4-30.263 产卵刻槽数x4与羽化孔数x6
No of oviposition scars (x4) and No of exit holes (x6)1:0.365 0.721 0.000 x6=0.359x4 + 0.863 侵入孔数x5与羽化孔数x6
No of entrance holes (x5) and No of exit holes (x6)1:0.533 0.950 0.000 x6=0.454x5 + 8.207 表 3 下段虫孔数量与整株羽化孔数量相关性的回归分析
Table 3. Regression analysis for correlation between numbers of boreholes on lower section and total eclosion holes on a diseased-tree trunk
项目
Item相关系数
R决定系数
R2F值
Ft值
tP值
Sig.回归方程
Regression equation整株羽化孔数y
No of emergent holes in the whole plant下段刻槽数x1
No of grooves in lower section (x1)0.834 0.695 139.118 11.795 0.000 y=0.477x1+14.4675 下段侵入孔数x2
No of entrance holes in lower section (x2)0.928 0.861 377.493 19.429 0.000 y=1.270x2+10.588 下段羽化孔数x3
No of exit holes in lower section (x3)0.941 0.886 473.915 21.770 0.000 y=2.610x3+8.116 -
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