[An ecological stoichiometry model based on the size of Nitraria tangutorum].

Ecological stoichiometry provides a new method for understanding the characteristics, driving forces and mechanisms of C, N and P coupled cycles. However, there are few reports on the variation in ecological stoichiometry of plants during their growth. In this study, we fitted the total elemental mass of different module based on the size of Nitraria tangutorum, and derived the ecological stoichiometry models of different module and whole ramet by measuring the biomass and nutrient concentrations of the current-year stems in 2017, 2-year-old stems, more than 2-year-old stems, leaves, roots and layerings of N.

sp. nov., isolated from farmland soil.

A Gram-stain-positive, aerobic, non-motile and coccoid-shaped bacterium, designated XNB-1, was isolated from farmland soil in Taian, Shandong province, China. Strain XNB-1 contained iso-C and iso-C as the predominant fatty acids. The diagnostic diamino acid of the peptidoglycan was ornithine, and the interpeptide bridge was l-Orn←Gly←d-Glu.

sp. nov., isolated from farmland soil.

A Gram-stain-positive, strictly aerobic, non-motile, non-spore-forming and rod-shaped bacterium, designated as strain G-1, was isolated from farmland soil sampled in in Fuyang, Anhui Province, PR China. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain G-1 was closely related to 2-36 (97.7 % similarity).

Pedobacter agrisoli sp. nov., isolated from farmland soil.

A Gram-stain-negative, aerobic, non-motile, non-spore-forming and rod-shaped bacterium, designated YHM-9, was isolated from soil in Yangquan, Shanxi Province, PR China. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain YHM-9 belonged to the genus Pedobacter and shared the highest similarity (97.4 %) to the type strain Pedobacter lignilitoris W-WS13.