Mean apparent nest density (number/ha) and standard errors (in parentheses) for obligate grassland birds in tree row edge and grassland interior habitats on the control and removal sites.

Mean apparent nest density (number/ha) and standard errors (in parentheses) for obligate grassland birds in tree row edge and grassland interior habitats on the control and removal sites.对照组与移除组样地内，树行边缘及草原内部生境中专性草原鸟类的平均表观巢密度（单位：每公顷巢数）及其标准误（标准误数值标注于括号内）。