毛竹尖胸沫蝉危害对毛竹枝叶黄酮和单宁含量的影响

毛竹尖胸沫蝉是近年出现的一种毛竹枝梢新害虫 ,经对毛竹受害与未受害枝、叶的黄酮、单宁含量测定 ,结果表明 :该虫对新梢的刺吸危害可极显著地增加受害枝条受害枝梢新叶 (A)和受害枝条未受害枝梢新叶 (B)的黄酮含量 ,每克干物质的黄酮含量比对照 [未受害枝条未受害枝梢新叶 (CK) ]分别增加 1 .990 6mg和 2 .2 75 6mg;但受害枝条受害枝梢 (D)和受害枝条未受害枝梢 (E)的黄酮含量却极显著地减少 ,每克干物质的黄酮含量比对照分别减少 1 .2 381 mg和 1 .1 579mg。与黄酮相同 ,该虫的危害也能极显著地增加受害梢新叶和受害枝条未受害枝梢新叶的单宁含量 ,每克干物质的单宁含量比对照分别增加 0 .42 91 mg和 3.1 981 mg;也极显著地减少受害枝条受害枝梢和受害枝条未受害枝梢的单宁含量 ,每克干物质的单宁含量比对照分别减少 3.62 74mg和 5.1 600 mg。毛竹枝叶受害引起这些次生物质含量的显著变化可能与诱导抗虫性有关 ,且这种诱导作用可在相邻枝梢及叶间传递。

Spatial modulation for electronic speckle patterns and its demodulation

A spatial modulation method for electronic speckle patterns is presented.Carrier fringes are produced by object tilting and the phase field of deformation is demodulated by Fourier transform.The principle is discussed.The system and some typical experimental results are offered.The results prove that by using object tilting method speckle patterns can be modulated very well and the out-of displacement of an object can be obtained effectively.