多效唑在土壤中降解、吸附和淋溶作用

STUDY ON DEGRADATION, ADSORPTION AND LEACHING OF PACLOBUTRAZOL IN SOILS

本文研究了植物生长调节剂多效唑(MET)在土壤中的环境引为,MET在土壤中降解较缓慢并随土壤环境条件而异,淹水厌氧条件比旱地好氧条件降解更缓慢,灭菌土壤中未见明显降解,微生物培养试验表明,MET对真菌有明显抑止作用,以MET为唯一营养源的培养基上能生长出几种放线菌,在三种供试土壤中,MET在高有机质含量的黑土中吸附常数远大于黄棕壤和潮土;MET的淋溶则在砂粒含量较高和有机质含量较低的潮土中最快,黑土最慢,黄棕壤居间.

This paper deals with the studies on degradation, adsorption and leaching of paclobutrazol, as a plant growth regulator, in soil. On the whole, paclo-biitrazol was shown to degrade rather slowly in all the three soils studied, but more slowly in flooded than in upland condition, and no distinct degradation was found in the sterilized soil. Experiment shows that fungi growth can be inhibited obviously by paclobutrazol. When culture media with paclobutrazol were the only nutrient source, several groups of microbes were growh and they were detected as actinomycetes such as lanvendulae, griseofusctis and micromonospore by using soil enrichment incubation. In the three soils tested the adsorption and leaching of paclobutrazol varied considerably. Thus, paclobutrazol had a comparatively higher adsorbing capacity in the black soil with a fairly high content of organic matter (6.5%) than in the yellow-brown earth and fluvo-aquic soil. However, paclobutrazol was leached the most rapidly in the fluvo-aquic soil due to its high content of sand(51.1%) and low content of organic matter(0.65%) , whereas it was leached the most slowly in the black soil, and the yellow-brown earth came intermediate.