内蒙古臭柏不同分布区生长与生态因子的关联分析

Using the Grey System Theory for analysis of relationship between Sabina vulgaris growth and ecological factors

为了探讨臭柏Sabina vulgaris生长及其影响因素，运用灰色系统理论中的关联分析法，分析了内蒙古自治区主要天然分布区内臭柏生长与生态因子的关系。结果表明：①内蒙古不同天然分布区内，臭柏可在年平均气温为一5．0℃以上，极端最低气温-43．0℃以上，极端最高气温38．6℃以下．年平均降水量180mm以上的干旱、半干旱地区生长；各地区新梢平均年生长量为7．7～14．6cm；②根据关联分析，各个生态因子对臭柏生长量的影响程度不同。其影响大小顺序从大到小依次为≥10℃积温、年降水量、极端最高气温、极端最低气温、年蒸发量、海拔高度和年平均气温。因此，在干旱区造林生产实践及臭柏引种推广过程中，在关注年降水量的同时，热量因子的影响不容忽视，尤其是≥10℃积温对臭柏生长产生重要的影响。

To study growth and influencing factors of Sabina vulgaris, habitat and growth conditions for regions of natural distribution in Inner Mongolia were surveyed, and the relationship between growth and ecological factors were analyzed with Grey System Theory. Results showed that （1） S. vulgaris could grow in arid and semiarid areas with an average annual temperature 〉 - 5.0 ℃, an extreme minimum temperature 〉 - 43.0 ℃, an extreme high temperature 〈 38.6 ℃, and an average annual rainfall 〉 180 mm. Also, the average annual shoot growth was between 7.7 and 14.6 cm. （2） According to Grey System Theory, the order of factors affecting S. vulgaris growth were： ≥ 10 ℃ accumulated temperature 〉 annual precipitation 〉 extreme maximum temperature 〉 extreme minimum temperature 〉 annual evaporation 〉 altitude 〉 average annual temperature. So for afforestation through introduction and dissemination of S. vulgaris in arid areas, annual precipitation should be considered, but the heat factor should not be ignored, especially the ≥ 10 ℃C accumulated temperature. [Ch, 2 fig. 2 tab. 14 ref.]