Aims

With the wide application of ⁷Be (Beryllium-7) in soil erosion investigations, retention and interception of ⁷Be by vegetation plays an important role in documenting soil ⁷Be redistribution, with a large impact on the interpretation of ⁷Be measurements. However, the dynamic and temporal changes in plants and the relationship with soil ⁷Be concentration remain unclear, and the significance of dead plants in ⁷Be interception is under-researched.

Methods

The samples of single plants (6 different species), compositive plants (including living and dead plants), along with soil reference on the Loess Plateau were collected individually to analyze the variations of ⁷Be concentration during the growth period from 2010 to 2012.

Results

The accumulation of ⁷Be per mass is significantly higher in leaves than stems. The ⁷Be activity per mass and per area in living plants with seasonal trends ranged from 173.9 to 703.1 Bq kg^–1 and 21.5 to 190.1 Bq m^–2, respectively, and in dead plants ranged from 381.8 to 964.5 Bq kg^–1 and 30.4 to 285.7 Bq m^–2. Precipitation accounted for the largest contribution to the accumulation of ⁷Be in plants, followed by plant growth, species and parts. Plants accounted for ⁷Be interception on slope up to 66% (living plants accounted for 7% ~ 31% and dead plants accounted for 6% ~ 44%). The interception of living plants is low at first, then increases with the accumulation of rainfall and biomass together.

Conclusions

Our results highlight that ⁷Be in plants (especially for the dead plants) is of great significance for ⁷Be in soil on the slope, and is controlled by precipitation, growth status and plant characteristics. The reference information obtained in this work will contribute to improving the accuracy of ⁷Be tracing technology, and broadening its scope.

中文翻译：

---

黄土高原植物7Be浓度变化及其对土壤7Be的意义——基于三年监测数据

目标

随着^{7 Be (Beryllium-7) 在土壤侵蚀调查中的广泛应用，植被对7} Be 的保留和截留在记录土壤⁷ Be 再分布方面发挥着重要作用，对⁷ Be 测量结果的解释产生了很大影响。然而，植物的动态和时间变化以及与土壤⁷ Be 浓度的关系仍不清楚，死亡植物在⁷ Be 截留中的意义尚待研究。

方法

分别采集黄土高原单株（6种）、复合株（包括活株和死株）及土壤参考样本，分析2010-2012年生长期^{7 Be浓度变化。}

结果

^每质量7 Be的积累在叶中显着高于茎。具有季节性趋势的活植物中每质量和每面积的⁷ Be 活度分别为 173.9 至 703.1 Bq kg ^-1和 21.5 至 190.1 Bq m ^-2，死植物中的 7 Be 活性范围为 381.8 至 964.5 Bq kg ^-1和 30.4至 285.7 Bq m ^–2。降水对植物中⁷ Be 积累的贡献最大，其次是植物生长、物种和部位。植物占⁷坡面截留率高达66%（活株占7%～31%，死株占6%～44%）。活植物的截获率先是低，然后随着降雨量和生物量的积累而增加。

结论

我们的研究结果表明，植物中的⁷ Be（尤其是死亡植物）对斜坡土壤中的⁷ Be 具有重要意义，并受降水、生长状况和植物特性的控制。在这项工作中获得的参考信息将有助于提高⁷ Be 追踪技术的准确性，并扩大其范围。