Spatial heterogeneity of regetation and productivity in semi-natural grassland

1.在不同放牧强度的半天然草地上进行了植被调查。在过去六年中，进行了调查，以确定在火、砍伐和不同放牧强度等人为干扰后的演替。根据贝塔二项分布对七年中获得的数据进行了分析。分析表明，在放牧强度较大的草地上，广泛分布的克隆植物占主导地位，导致草地植被异质性增强。与种子传播型植物相比，克隆植物使植被更具异质性。这一结果被提交给草原科学发表。(3)在上述调查的基础上，尝试了描述植物群落空间格局的格子模型。(4)利用本研究项目中购买的C/N分析仪对草地土壤碳/氮进行了分析，确定了草地土壤碳/氮的空间格局。东北国家农业研究中心进行了一系列草原调查。对这四年中取得的结果进行了分析和记录。放牧草地上的围栏使植被异质性增强，物种组成发生变化，物种多样性增加。

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.