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NBPT在土壤中的降解及其影响因子

李涛1,2;石元亮1;李学文3;林国林3   

  1. 1中国科学院沈阳应用生态研究所,沈阳 110016;2中国科学院研究生院,北京 100039;3沈阳农业大学土地环境学院, 沈阳 110161

  • 收稿日期:2005-12-29 修回日期:2006-05-07 出版日期:2006-09-10 发布日期:2006-09-10

Degradation and its affecting factors of NBPT in soil

LI Tao1,2; SHI Yuanliang1; LI Xuewen3; LIN Guolin3   

  1. 1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;2Graduate University of Chinese Academy of Sciences, Beijing 100039, China; 3College of Land and Environment, Shenyang Agricultural University, Shenyang 110161, China

  • Received:2005-12-29 Revised:2006-05-07 Online:2006-09-10 Published:2006-09-10

摘要: 采用实验室培养方法研究了NBPT在土壤中的降解动态。结果表明,在未灭菌的土壤中,NBPT的半衰期为7.2~7.6 d,远远小于在灭菌土壤中22.4 d的半衰期;随着环境温度增高(20 ℃上升至30 ℃),NBPT降解速度略有提升(半衰期由7.6 d缩短至6.5 d);NBPT在黑暗条件下降解半衰期为4.5 d,而在光照条件下的半衰期为5.9 d。可见,几种试验因子对土壤中NBPT的降解均有不同程度的影响。其中土壤微生物是影响NBPT降解的主要因素,有利于土壤中微生物生长的环境因素,如偏酸的土壤,对土壤中NBPT的降解有促进作用。而葡萄糖则可能因为增加了土壤颗粒的团聚性及其还原性能,增加了土壤对NBPT的吸附而抑制了NBPT的降解。

关键词: 林窗, 林缘, 林墙, 热力作用面, 表面温度

Abstract: The incubation test showed that the half-life of NBPT was 7.2~7.6 d in non-sterilized soil, and 22.4 d in sterilized soil. When the temperature was raised from 20 ℃ to 30 ℃, the degradation rate enhanced slightly, and the half-life was shorted from 7.6 d to 6.5 d. Light intensity also had some influence on the degradation of NBPT, with the half-life of 4.5 d and 5.9 d in dark and light, respectively. Microorganism was the critical factor of NBPT depletion in soil. Environmental factors favorable for microbial growth, such as acid soil, could also enhance the degradation of NBPT in soil. Glucose could inhibit the degradation of NBPT, because it could increase soil aggregation, and thus, increase the adsorption of NBPT by soil.

Key words: Canopy gap, Edge of forest, Woody wall, Thermal active surface, Surface temperature