宁夏大罗山自然保护区种子植物区系特征

The Features of Seeds Flora in the Da Luo Mountain Nature Reserve in the Desert Land of Ningxia

据统计，大罗山自然保护区种子植物有65科、164属、263种。其中裸子植物有3科、6属、7种；被子植物有62科、158属、256种。植物区系的基本特点：（1）植物区系成分中温带成分占优势；（2）植物区系成分以年青性为主而兼有古老性；（3）植物区系的垂直分异显著；（4）该地是多种植物分布区的边缘地带，植物区系具有明显的脆弱性；（5）该地植物区系的个性特征不明显。

According to our investigation, there are 65 families, 164 genera and 263species in Da Luo Mountain Nature Reserve of Ningxia. In which there are 3 families, 6 genera and 7 Gymnospermae species, 62 families, 158 genera and 256 angiospermae species.The basic features of the seeds flora are as follows: (1)The temperate floristic elementsoccupy a dominant position in Da Luo Mountain. (2)The floristic compositions are young andlittle ancient. (3)The floristic elements change as the height of the mountain ascending. (4)Da Luo Moumtain is ail external zone of many plants species distribution. (5)The characterof the plant flora is not obvious.