Spatial heterogeneity of regetation and productivity in semi-natural grassland

1.在日本栃木县西那须野不同放牧强度的半天然草地上进行了植被调查。在过去的六年里，进行了调查，以确定在人为干扰，如火灾，切割和不同的放牧强度后的演替。根据β-二项分布分析了7年期间获得的数据。分析表明，强放牧强度使草地植被的异质性增强，这是因为在强放牧强度的草地上，广泛分布的克隆植物占优势。与种子传播植物相比，克隆植物使植被更加异质。该结果已提交给GRASSLAND SCIENCE出版。(3)在上述调查的基础上，尝试建立了描述植物群落空间格局的格点模型。(4)利用自行购置的C/N分析仪对草地土壤C/N进行分析，确定其空间格局.东北农业研究中心进行了一系列的草地调查。对这四年中取得的成果进行了分析和记录。放牧地的刈割增加了植被的异质性，改变了物种组成，提高了物种多样性。

1. At the semi-natural grasslands different in grazing intensity, which are located in Nishinasuno, Tochigi, Japan, vegetation surveys were carried out. Surveys to determine the succession after artificial disturbances such as fire, cutting and different grazing intensities have been carried out during the past six years. Data obtained during the seven years were analyzed based on beta-bimomial distribution. The analyse clarified that a strong intensity of grazing made grassland vegetation more heterogeneous because in the grassland with a strong grazing intensity, clonal plants which widely dispersed dominated. Clonal plants makes vegetation more heterogeneous compared with seed-dispersal plants. This result was submitted to GRASSLAND SCIENCE for publication. (3) Based on the surveys mentioned above, a lattice model describing the spatial pattern of the plant community was tried. (4) Soil carbon/nitrogen in the grassland were analysed to determine the spatial pattern using a C/N analyser purchased in this research project.2. A series of grassland survey has been carried out at the Tohoku National Agricultural Research Center. Results obtained during these four years were analyzed and documented. Dings on grazing pasture made vegetation more heterogeneous, changed species composition, and made species diversity high.