3-5-3

AS we have seen ,producers are the source of all nutrients or food in an ecosystem for themselves and for consumer organisms. only the biomass represented by NPP is available as nutrients for consumers ,and they use only a portion of this amount.thus, the planet's npp ultimately limits the number of consumers that can survive on the earth. this is an important lesson from nature.

生產者是他們自己和消費者有機體在生態所有營養物食物的來源。只有生物量已NPP描述做為消費者可利用的營養物並且他們只使用這部份。因此行星上的NPP最後能限制在地球上存活消費者的數量。這是從自然中學到一個重要的課。

Peter Vitousek, Stuart Rojstaczer, and other ecologists estimate that humans now use, waste, or destroy about 20-32% of the earth's total potential NPP. This is a remarkably high value, considering that the human population makes up less than 1% of the total biomass of all of the earth's consumers that depend on producers for their nutrients.These scientists contend that this is the main reason why we are crowding out or eliminating the habitats and nutrient supplies of so many other species and degrading or destroying som of the ecosystem services they provide.

Peter Vitousek, Stuart Rojstaczer和其他生態科學家估計現在人類所使用、浪費或沒有用的佔地球全部的聲產比率20-32%，這是一個另人引人注目的高值。研究發現人類族群組成佔總生物量的1%，然而全部地球的消費者卻都依賴生產者給它們的營養。這些科學家認為主要的原因是我們排除棲息地和營養供應在許多其他的物種和破壞一些它們所提供的生態系統服務。