Species richness counts & climate and tree measurements

Species richness, location, Openness and Circumference data was collected in the field. Climate data was obtained from BioClim. Columns: Country: Norway or Sweden. OakID: Unique tree identifier number. UTM33_X and UTM33_Y: co-ordinates for each tree location in UTM33. Circumference: Girth of the tree at breast height. Openness: Openness of tree canopy (see paper for description). MeanTempWarmestQuart - mean temperature during the warmest quarter of the year. MeanPrecipWarmestQuart - mean precipitation during the warmest quarter of the year. NorthernSpecialist - OtherGeneralist: species richness counts per tree. See paper for category descriptions.

本数据集的物种丰富度、样点位置、林冠开阔度（Openness）与胸径周长（Circumference）数据均通过野外实地采集获得；气候数据取自BioClim数据集。数据集包含以下列：
1. 国家（Country）：取值为挪威或瑞典；
2. OakID：树木唯一识别编号；
3. UTM33_X与UTM33_Y：每棵树样点在UTM33坐标系下的坐标值；
4. Circumference：树木胸径处的树干周长；
5. Openness：树木林冠开阔度，详细说明参见相关论文；
6. MeanTempWarmestQuart：年度最暖季度的平均气温；
7. MeanPrecipWarmestQuart：年度最暖季度的平均降水量；
8. NorthernSpecialist - OtherGeneralist：单棵树木对应的物种丰富度计数，物种分类的详细说明参见相关论文。