石漠化地区土壤侵蚀作用的大气成因10Be同位素地球化学示踪研究

我国西南石灰岩地区喀斯特石漠化现象相当严重且有蔓延趋势。长时间尺度土壤侵蚀速率测定有助于了解岩石风化历史和土壤的长期稳定性。本项目拟通过联合利用大气沉降成因的宇宙射线成因核素10Be和其稳定同位素9Be对我国喀斯特石漠化地区进行的长时间尺度土壤侵蚀速率测定，开发10Be-9Be耦合示踪技术，为石漠化地区的防治提供基础数据资料。利用活性10Be/9Be比值研究小流域地表侵蚀作用可为研究石灰岩地区化学风化作用提供一个新的视野。开展不同环境条件（如酸雨）以及土地利用方式对石漠化地区土壤侵蚀速率的影响研究可为这类地区的可持续发展提供科学方法和依据。

The karst rocky desertification is a very serious environmental issue in the southwestern China and there is trend of spreading. Determination of the long-term soil erosion rate helps to understand the history of the long-term rock weathering process and stability of the soil. The project intends to estimate the long-term soil erosion rate in hill slope and the Earth surface denudation rate on a small catchment scale by joint application of cosmogenic nuclide 10Be and its stable isotope 9Be in China’s karst rock desertification areas, and to develop atmospheric origin 10Be-9Be coupling tracer technique, so as to provide basic data and information for the prevention and treatment of rocky desertification. The Earth surface denudation rate on a small catchment scale determined by active 10Be/9Be ratio method may provide a new perspective of the investigation of chemical weathering process in limestone areas. Investigations on factor affecting soil erosion rate such as environmental conditions (eg. acid rain) and land use in the rocky desertification area may provide scientific methodology and basis for sustainable development of such areas.