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分析了青藏高原（东北部）现代植物（全部为Ｃ３植物）全木混合样的碳同位素组成（其δ１３Ｃ值分布范围一般为－２３５‰～－３０８‰，平均值为－２６６‰），对影响其变化的各种环境因素进行了探讨。研究表明，降雨量及大气压力是影响该区植物δ１３Ｃ值变化的最重要环境因素。一方面，降雨量增大，空气相对湿度增大，植物的δ１３Ｃ值降低（偏负）；另一方面，大气压力降低，植物的δ１３Ｃ值增大（偏正）。可见，植物中保存着自然环境变化的大量信息。
The carbon isotope compositions of all-wood mixed samples of modern plants (all C3 plants) in the Qinghai-Tibet Plateau (northeastern part of China) are analyzed (their δ13C values are generally -235 ‰ ~ -308 ‰ with an average of -26 6 ‰), discusses the various environmental factors that affect their changes. Studies have shown that rainfall and atmospheric pressure are the most important environmental factors that affect the δ13C value of plants in this area. On the one hand, the δ13C values of plants increased (decreased) when the rainfall increased and the relative humidity of the air increased. On the other hand, the atmospheric pressure decreased and the δ13C values of plants increased (positively). It can be seen that plants contain a great deal of information about the changes in the natural environment.