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Our results confirmed batatasin-III as a stable compound capable of inhibiting germination and/or mean root elongation in all of the tested species, but this effect was modified by growth substrate. Surprisingly, the measured batatasin-III content of E. nigrum leaves (mean value 19.7 �� 10.8 (SE) mg g?1) and humus (mean value of 1 �� 1.5 (SE) ��g g?1) did not predict the inhibitory effect on mean root elongation. Although http://www.selleckchem.com/products/Everolimus(RAD001).html batatasin-III was found to be phytotoxic to all the tested species, we conclude that this substance alone should not be used as a proxy for the allelopathic effect of E. nigrum. ""Plantations are established for a variety of purposes including wood production, soil and water conservation, and carbon sequestration. However, their implications for species diversity are considerably debated. To assess restoration effect of species diversity in plantations after 50 years�� natural restoration, understory herb species diversity of Chinese pine (Pinus tabulaeformis) plantations were characterized and compared with secondary growth oak (Quercus wutaishanica) forests by additive partitioning across three different nested spatial scales (subplot, plot and site scales) in the middle of the Loess Plateau, northwestern China. Whether these two forest types demonstrate different structuring processes was also examined by quantifying the relative contributions of space and the environment on community composition. http://www.selleck.cn/products/Bortezomib.html Overall, the two forests displayed similar accumulation of species diversity across spatial scales. The contribution of species diversity components increased with the spatial scale, and both http://www.selleckchem.com/products/PD-0332991.html forests displayed lower alpha diversity at the subplot scale but higher beta diversity at the plot and site scales. There was no significant difference in alpha or beta diversity between the two forests at any of the three scales, but in species compositions at the subplot and plot scales (p