Study on Population Distribution, Morphological Structure and Physiological-Biochemical Characteristics of \u3cem\u3eDactylis glomerata\u3c/em\u3e in Different Geographical Areas of Tianshan Mountains of Xinjiang in China

As one important cool-season grass with high resource value, Dactylis glomerata has many characteristics such as good adaptability, high nutritional value and so on. It is one of the major cultivated species planted in high quality artificial grassland in the world. Xinjiang is one of the major areas have rich germplasm resource of wild Dactylis glomerata, and it is a natural gene pool. In order to protect and make good use of wild plant resources, this study focused on the distribution patterns, distribution regulation, morphological structure and physiological-biochemical characteristics of wild Dactylis glomerata grown in different geographical areas of Tianshan mountain of Xinjiang. It is aims to reveal the effects of geographical space and habitat on the population distribution in, morphological structure and physiological-biochemical characteristics of Dactylis glomerata

R2R^2 corrections to holographic heavy meson dissociation

In this paper, we study the $R^2$ corrections to the spectral functions of heavy mesons in Gauss-Bonnet gravity. We discuss the effect of Gauss-Bonnet parameter $\lambda_{GB}$ on the 1S states and 2S states of charmonium and bottomonium. It is found that $\lambda_{GB}$ reduces the height and increases the width of the 1S states peak. The 2S states of charmonium and bottomonium dissociate gradually as increasing $\lambda_{GB}$. It is obvious that $\lambda_{GB}$ enhances the dissociation of charmonium and bottomonium.Comment: 13 pages, 4 figure