Wang Yang, Cerling T E, Effland W R
Department of Geology and Geophysics, University of Utah, 84112, Salt Lake City, UT, USA.
Department of Agronomy, Iowa State University, 50011, Ames, IA, USA.
Oecologia. 1993 Sep;95(3):365-369. doi: 10.1007/BF00320990.
Stable isotope ratios of pedogenic carbonate and organic matter were measured in a prairie-transition-forest soil biosequence near Ames, Iowa to determine the vegetation succession. The modern vegetation is dominated by non-native C plants which have been introduced by agricultural practices. The δC values of soil organic matter from the prairie and forest endmembers indicate C and C dominated ecosystems, respectively, during the accumulation of soil organic matter. Pedogenic carbonate from all soils, including rare pedogenic carbonate from the forested soil, has an average δC of-2.0‰, indicating that the carbonate formed under a C vegetation. These results indicate that the ecosystem was a C-dominated prairie and therefore suggest a recent arrival of forests and other C plants in the area. This study also implies that the primary features of the transitional Lester soil series, which has soil properties intermediate between Alfisols and Molisolls, formed under prairie conditions and were overprinted by an invading forest.
在爱荷华州埃姆斯附近的一个草原 - 过渡 - 森林土壤生物序列中，测量了成土碳酸盐和有机质的稳定同位素比率，以确定植被演替情况。现代植被以通过农业实践引入的非本地C4植物为主。草原和森林端元土壤有机质的δ13C值分别表明，在土壤有机质积累期间，该生态系统分别以C3和C4为主。所有土壤中的成土碳酸盐，包括来自森林土壤中罕见的成土碳酸盐，平均δ13C为 -2.0‰，表明碳酸盐是在C3植被下形成的。这些结果表明，该生态系统曾是以C3为主的草原，因此表明该地区森林和其他C4植物是近期才出现的。这项研究还表明，具有介于淋溶土和软土之间土壤性质的过渡性莱斯特土壤系列的主要特征，是在草原条件下形成的，并被入侵的森林覆盖。
