Temporal and spatial variations ofδ~(15)N andδ~(13)C of particulate organic matter were investigated in Liuxihe reservoir,a subtropical oligo-mesotrophic reservoir during May-December in 2008. δ~(13)C_(POM) varied from -23.6‰to -31.8‰,with an average of -26.5‰,close toδ~(13)C terrestrial C_3 plants with an average -27‰.
本文于2008年5月至12月对流溪河水库颗粒有机物δ~(15)N和δ~(13)C的时空变化研究发现:δ~(13)C_(POM)在-23.6‰～-31.8‰之间,平均值为-26.5‰,与C_3植物δ~(13)C(-27‰)非常接近。
参考来源 - 流溪河水库颗粒有机物碳氮稳定同位素时空变化·2,447,543篇论文数据，部分数据来源于NoteExpress
Objective To analyze the temporal and spatial variations of radon concentration by measuring in some LABS and typical buildings in Chengdu.
目的通过对成都某几个氡气观测实验室以及代表性建筑物的氡浓度测量，分析氡浓度的时间变化特点和垂直变化特点。
In order to evaluate the effect of different tillage types on soil moisture, the paper analyses the temporal and spatial variations of soil moisture under plough tillage and no-tillage.
为了揭示农牧交错地区不同农田耕作方式对其水分环境的影响过程及规律，选择翻耕地和免耕地两种土地耕作类型，分析不同耕作方式下土壤水分的时空变化情况。
Spatial and temporal variations in the air movement are desirable for fresh environments.
空气运动随空间和瞬时而变化是新鲜环境的要求。
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