| 摘要: |
| 地球上９８％的氮素存在于原生岩（火成岩）中，但其对氮素循环贡献甚微；大气圈中的气态氮仅是地球中总氮素质量的１．９％，但实际上是供应所有生命需要的唯一氮源；生物圈中的氮量很小，然而全球植物初级净产物中９０％～９７％的氮在生物圈内循环。氮素在生物圈中的循环主要包括增加、损失和转化３个途径，这种循环因生态系统而不同。 |
| 关键词: 氮素，循环，氮素分布，地圈，气圈，生物圈 |
| DOI： |
| 分类号:S154 |
| 基金项目: |
|
| Geobiological Distribution of N and Its Cycle |
|
Zhang Chi Li Shengxiu Wang Changcun,Zhang Chi Li Shengxiu Wang Changcun,Zhang Chi Li Shengxiu Wang Changcun
|
| Abstract: |
| The primary (igneous) rocks of the earth's crust hold approximately 97.8% of the global N.However,these rocks contribute very little to the cycling of N.Although gaseous N in the atmosphere represents only 19% of the earth's total N mass,it
has apparently contributed virtually the sole source of N for nutrition of all forms of
1ife.In comparison with N contained in the atmosphere and lithosphere,the quantities
present in the biosphere are very small.However,on a global scale,90一97% N content
of the net primary production of plant is derived from recyeling of N within the biosphere.The N cycling in the biosphere include 3 ways in the main;additions,losses and
transformations,and the cycling varies with different ecosystems. |
| Key words: N eycling ,N distribution ,lithosphere ,atmosphere, biosphere |
