通过四合木异地播种生长量比较、以及四合木对土壤的适应性和对水热综合因子的适应性分析,得到如下结果:(1)四合木生长量高低的顺序为乌海区的东胜土(12.12g)〉乌海区的乌海土(10.62g)〉东胜区的乌海土(3.10g)〉东胜区的东胜土(2.59g)。同一地区不同土壤间四合木生长量之间没有差异(P≥0.05),不同地区相同土壤间的生长量之间却有十分显著的差异,说明了土壤条件对四合木的生存影响是次要的,气候条件是保证四合木生存的最重要的条件。(2)四合木分布区与异地保护区之间9种土壤微量元素具有差异,但由于四合木植株中的微量元素含量均高于土壤中的有效量,说明四合木对微量元素具有富集作用,土壤微量元素含量不是四合木成活与生长的限制因子。(3)四合木分布区与异地保护区之间各月平均温度差异显著;全年气温日较差以及温暖指数、寒冷指数、湿润指数和水热综合因子指数差异显著;生长季地表地温昼夜温差具有特殊性,这可能是异地保护不易成功的限制因子之一。
This study was conducted from May, 2002 to September, 2003 by comparing the growth of Tetraena mongolica Maxim in ex situ seeding area and analyzing the adaptabilities of T. mongolica to soil and climate factors. Some results were shown below: Firstly rank of T. mongolica growth was Dongsheng soil in Wuhai area (12.17g), local soil in Wuhai area (10.57g), Wuhai soil in Dongsheng area (3.10g), and local soil in Dongsheng area (2.59g). There was no significant difference among soil derived from the same area in terms of the amount of growth (p≥0.05). However, the growth of T. mongolica showed more significant difference in the same soil from different areas. Consequently, the survival of T. mongolica was most likely to be determined by climate other than by soil. Secondly content of available N, P, and K showed significant differences between T. mongolica distribution area and their ex situ conservation area. However it contributed little to the growth of T. mongolica. The amount of 9 kinds of trace elements was higher in T. mongolica than in soil, which suggested that this plant had the ability to accumulate trace elements. Therefore the content of 9 trace elements although they showed significant differences. Impacted little on the survival and growth of T. mongolica There were significant differences between T. mongolica distribution area and their ex situ conservation area in annual mean precipitation ( 157.89 〈 381.d8mm, p≤ 0.05), monthly mean precipitation (p ≤ 0.05), annual mean temperature ( 9.84 〉 6.16℃, p≤ 0.05 ), monthly mean temperature ( p ≤ 0.05 ), warm index ( 97.6467 〉 68. 2267,p≤ 0.05), cold index ( - 39. 5200 〈 - 53.1200, p≤ 0.05 ), humidity index ( 1. 6151 〈 5. 6610, p ≤ 0.05 ), and integrated index of precipitation and temperature ( 13.6031 〈 32.6013, p≤0.05). In the distribution area of T. mongolica, the mean day-to-night difference in surface atmosphere temperature is around 12℃. However, this difference fo