英语翻译The slowness of decomposition of humic substances is a factor in the decomposition lag and oxygen accumulation in an ecosystem that has been stressed.In general appearance,humus is a dark,often yellow-brown,amorphous or colloidal substanc

英语翻译The slowness of decomposition of humic substances is a factor in the decomposition lag and oxygen accumulation in an ecosystem that has been stressed.In general appearance,humus is a dark,often yellow-brown,amorphous or colloidal substanc
英语翻译
The slowness of decomposition of humic substances is a factor in the decomposition lag and oxygen accumulation in an ecosystem that has been stressed.In general appearance,humus is a dark,often yellow-brown,amorphous or colloidal substance that difficult of characterize chemically.No great difference in the physical properties or chemical structure of humus exist between different terrestrial ecosystems,but studies suggest that marine humic materials have a different origin and hence a different structure.This difference is related to the fact that there are no lignin-rich,woody plants in the sea,so humic compounds are derived fron less aromatic algal chemicals.
In chemical terms,humic substances are condensations of aromatic compounds combined with the decomposition products of proteins and polysaccharides.A model for the molecular structure of humus derived from lignocellulose is shown in Figure 2-15.The phenolic benzene rings and the side-chain bonding make there compounds recalcitrant to microbial decomposition.Ironically,many of the toxic materials that humans are now adding to the environment,such as herbicides,pesticides,and industrial effluents,are derivatives of benzene and are cousing serious trouble because of their low degradability and their toxicity.
The overall energy budget of an ecosystem reflects a balance between income and expenditure,just as in hte bank account.The ecosystem gains energy through the photosynthetic assimilation of light by green plants and transport of organic matter into the ecosystem fron external sources.More will be said regarding this balance between production.
这个专业性有点强 估计真的要是达人才可以翻译的了 小弟在此谢过 求比这两个专业点的

英语翻译The slowness of decomposition of humic substances is a factor in the decomposition lag and oxygen accumulation in an ecosystem that has been stressed.In general appearance,humus is a dark,often yellow-brown,amorphous or colloidal substanc
腐殖质的物质的分解的缓慢是一个在一已经被强调的生态系中分解减慢和氧积累中因素.从普遍外表看来,腐殖质是一黑暗,常常黄色-棕色,无固定形状的或者胶体的物质那样困难的刻划性格用化学.禁止伟大在腐殖质的物理特性或者化学结构中差异在不同陆地生态系之间存在,但是研究建议海洋腐殖质的材料有一不同起源和因此一不同结构.这差异是和事实事实上没有在大海中木素-丰富,树木茂盛的植物,所以腐殖质的化合物是得到fron不那么水藻的芳香的化学制品有关.
在化学条款中,腐殖质的物质是把芳香的化合物与蛋白质和多糖的分解产品结合起来的凝聚.一个来自木素纤维素的腐殖质的分子的结构的模范被在图2-15中展示.酚的苯环和侧链-屏蔽接地那里使化合物变得难以微生物的分解的.具有讽刺意味,很多中毒的材料,现在人正给例如除莠剂,杀虫剂和工业流出的水流环境添加的由于他们的低降解性和他们的毒力是苯的派生物和正共同使用严肃麻烦.就象,在hte银行帐户记述中一生态系的总能量估算反映出一在收入和费用之间平衡.生态系通过经过绿色植物光和变为生态系fron运输有机物质的光合的吸收获得能源外部来源.更多将被关于这在生产之间平衡说.