The function of improving productivity of ecosystem.
提高生态系统生产力的作用；
Nitrogen and phosphorus are the necessary mineral nutrition to trees. They determine the growth of individual, the development of community and the productivity of ecosystem in the nature.
氮、磷是树木必需的矿质营养，在自然界中它们影响着树木个体的生长、群落的发育及整个生态系统的生产力。
The productivity or fertility of such an ecosystem increases as the amount of organic material that can be broken down into nutrients increases.
随着分解为营养物的有机物质总量的增加，这种生态系统的生产力或肥沃度也增加。
Phosphorus (p) is one of the main limiting nutrients to the plant growth and net primary productivity (NPP) in terrestrial ecosystem.
磷元素是陆地植物生长和生态系统净初级生产力的主要限制因子之一。
Agricultural ecosystem is a complicated man-made ecosystem and the increase of its productivity is the main object of agricultural production.
农业生态系统是复杂的人工生态系统，提高其生产力是农业生产的主要目标。
The distribution pattern and productivity of terrestrial ecosystem are greatly affected by global warming.
随着未来全球变暖，将给这里的陆地生态系统分布格局和生产力带来巨大影响。
Grassland sandy desertification is one of the main reasons that the grassland ecosystem degradation and productivity decline continuously.
草地沙化是引起草地持续退化和生产力不断下降的主要原因之一。
Biomass is one of the criteria on measuring productivity of grassland, which represents the capacity of ecosystem on utilizing materials and energy.
生物量则是衡量草原生产力大小的标准之一，代表了生态系统利用物质和能量的能力。
Nitrogen cycling in farmland ecosystem is one of the key factors to affect agricultural productivity and at the same time it affects the environment.
农田生态系统中的氮循环是影响农业生产力的主要因素之一，同时也会对环境产生影响。
Soil organic matter is a very important part of forest ecosystem productivity, and is also a very important tache of biological cycling in forest ecosystem.
土壤有机质为森林生态系统生产力构成的重要部分，是森林生态系统生物循环中的重要环节之一。
Soil organic matter is a very important part of forest ecosystem productivity, and is also a very important tache of biological cycling in forest ecosystem.
土壤有机质为森林生态系统生产力构成的重要部分，是森林生态系统生物循环中的重要环节之一。
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