木本植物对汞耐性的研究

土培与水培相结合的模拟试验结果表明:当年生木本植物对汞具有较强的耐受性,并依不同种而呈现差异。其中加拿大杨>晚花杨>旱柳>辽杨。加拿大杨体内汞的耐受阈值约为95—100ppm,每株体内最大汞吸收积累总量约为6779μg。超过耐受限度,植物生长发育将出现显著抑制伤害。根细胞壁对汞的亲合吸附,根系脱氢酶活性的提高,以及过氧化物同工酶含量与谱带的增加可直接或间接地有助于植物对汞耐性的增强。

STUDY ON THE TOLERANCE OF WOODY-PLANTS TO MERCURY

The simulating tests by using soil and solution cultivation showed that annual woody-plants have certain tolerance to mercury and the tolerant capacity varies with different tree species. The order is as follows.populus canadensts>populus xeura-mericana>salix matsudaria>populus nummowiczii.In the P.canadensis, the tolerant threshold cocentration to mercury is about 95-100ppm and the maximum absorbed amount of mercury is about 6779Hg. Above the threshold, the growth and development of the plants appear evident injures. The affinity adsorption of root cell wall to mercury, the rising of dehydrogen ase activities in root system,and the increase in the amount and the spectral band of peroxidease series may be directly or indirectly helpful for woody-plants to inciease Hg-tolerance.