初级生产

底层营养盐通量对水层初级生产所需无机N的贡献为14%、对无机P有负的贡献（表现为净吸收）。

The sediment nitrogen release contributes to 14 % requirement of inorganic N for the primary production in the water column whereas net absorption of phosphate makes a negative contribution .

细根年净生产量20～1317g·m-2·a-1，占林分总净初级生产量的3%～84%，大部分在10%～60%；

Annual fine-root net primary production ( NPP ) was 20 ~ 1317 g · m - 2 · a - 1 , amounting to 3 % ~ 84 % of total stand NPP , mostly 10 % ~ 60 % .

海洋初级生产过程中原核生物和真核生物的作用

The roles of prokaryote and eukaryote in marine primary production processes

铁在海洋初级生产过程中的作用

The Role of Iron in Primary Productivity in the Sea

这一次，初级生产商是最大的受益者。

This time , primary producers are the biggest beneficiaries .

西双版纳原始热带湿性季节雨林生物量及净初级生产

Biomass and net primary production of primary tropical wet seasonal rainforest in Xishuangbanna

杉木人工林群落净初级生产的能量结构特征

Characteristics of Energy Structure of Net Primary Production in Chinese Fir Plantation Community

1981&2000年内蒙古中部地区植被净初级生产量变化研究

Study on Net Primary Production Variations in the Central Part of Inner-Mongolia during 1981-2000

西双版纳热带次生林净初级生产量的初步研究

A preliminary study on the net primary production of the secondary tropical forest in Xishuangbanna

近些年该水库鱼类对生长季节的初级生产量的利用率为O.61%。

The utilization rate of the primary production in growth season by fishes was 0.61 % .

连续放牧群落净初级生产量高于禁牧群落，为超补偿生长。

The primary production under CG is higher than the FG and appeared as over-compensatory growth .

四墩子草地农业生态系统初级生产太阳能转化率偏低（0.056%）；

The efficiency of solar energy conversion into the primary production was lower ( 0.056 % ) .

氮是陆地生态系统植物光合作用和初级生产过程中最受限制的元素之一。

Nitrogen was one of the most limited elements of plant photosynthesis and primary production processes in terrestrial ecosystems .

水生植被是湖泊生态系统的重要组成部分，具有显著的初级生产功能和环境生态功能。

As the important section of lake-ecosystem , hydrophytic vegetation is of the function of primary production and ecosystem .

对地上部分净初级生产量和植物种子的消费率分别为5.65%和68.14%；

Consumption efficiency on the total aboveground net primary production and plant seeds was 5.56 % and 68.14 % respectively .

支持湖泊和池塘中食物链的有机物和能量的主要来源是通过本地光合作用进行的内部初级生产。

Whole-lake carbon-13 additions reveal terrestrial support of aquatic food webs Ecosystems are supported by organic carbon from two distinct sources .

县域经济的发展在很大程度上还处于依赖区内初级生产要素的低级发展阶段，高等生产要素发育较少，对经济的推动作用还没有显现出来。

The development of county economy on a great degree depends on regional elementary product factor , advanced product factor developed slowly .

归纳了草群的组成及结构特征，总结了草地初级生产能力的特点，阐述了温性干草原初级生产能力分布的空间规律、季节动态及年动态，提出了合理利用这类草地的建议。

The seasonal and annual dynamics of grassland primary productivity are summarized . The technical system fro rational utilization of grassland is suggested .

初级生产、加工、分发和销售中良好的控制与操作，对安全食品的生产来说都必不可少。

Good controls and practices during primary production , processing , distribution and sale are all essential to the production of safe food .

高层区的地层渗透率和溶解气体比预期的都要高，这表明了高效的初级生产不需要大规模地生产砂。

Higher than expected formation permeability and dissolved gas in the upper zone suggest that massive sand production may not be required for effective primary production .

森林-草地生态系统有它的农学含义，涉及前初级生产层、植物生产层、动物生产层和后动物生产层四个生产层的许多方面。

ABSTRACT The forest-grassland ecosystem in agronomy refers to the various aspects of the pre-primary production , plant production , animal production and post-animal production stages .

由于对食品和石油等大宗商品的需求缺乏弹性，这些商品价格下降的速度甚至比整体价格水平更快，使初级生产商陷入了困境。

Since demand for commodities , including food and oil , was inelastic , their prices fell even faster than the overall price level , causing distress among primary producers .

秋季异养细菌生产力与初级生产的比值明显高于春季，且东海高于黄海。

The ratio of BP : PP was higher in fall than it was in spring and it was higher in the East China Sea than it was in the Yellow Sea .

结果表明，该地区养羊牧业生态系统中初级生产中光能利用率为0.13%，次级生产中饲料转化率为2.7%，都属于偏低水平。

The results show that the utilization rate of solar energy is 0 . 13 % in the section of primary production and ratio of second production is 2 . 7 % .

通过测定杉木人工林群落的生物量和各组分的热值，探讨了该群落净初级生产的能量积累和分布。

The biomasses and caloric values of each component or organ of Chinese fir plantation communities were measured in order to discuss the energy storage and distribution of net primary production in the community .

初级生产主要控制因素为营养盐的变化，河流输送的营养盐对本区海洋初级生产力的影响较大，陆源物质的输送是南黄海初级生产力变化的主要控制因素。

The nutrients transported by rivers influenced greatly the marine primary productivity of the study area . The input of terrigenous materials is the main controlling factor of the primary productivity in the South Yellow Sea .

从外部市场环境看，中国虾产品的竞争优势表现在充足的初级生产要素和日渐成熟的国内消费市场，竞争劣势表现在高级生产要素不足、相关产业发展滞后以及国内与国际市场需求的差异。

From the market environment , the advantage comes from primary production element and mature consumption market . The disadvantage is from advanced production element , correlative industry and the different demand between interior and international market .

通过溶解态铝与营养盐含量的统计分析表明，罗纳河中的溶解态铝与初级生产之间不存在相关关系，它的含量主要受界面吸附过程控制。

Statistical data analysis shows that there is no correlation between the dissolved aluminum and nutrients , the most important process controlling the concentration of aluminum is dominated by the adsorption / desorption reaction between the interfaces .

大气沉降补充的营养盐占年初级生产所需氮、磷的6%和1.5%，为河流输入营养盐的3～5倍。

The nutrients compensated by the atmospheric sedimentation account for 6 % of nitrogen and 1.5 % of phosphorus consumed by the annual primary production , which are 3 to 5 times the nutrients discharged by the rivers .

其中，硒有利于浮游植物的生长；锑和砷通过磷的吸收途径被浮游植物摄取；碲和锡抑制浮游植物的生长，因此这些元素在一定程度上控制浮游植物初级生产的规模。

Among these elements , Se was required for the normal growth and development of phytoplankton ; Sb and As were assimilated by phytoplankton via the phosphate uptake pathway ; Te and Sn could inhibit the growth of phytoplankton .