不同岩性土壤对皂荚幼树生长及生物量的影响

The effects of soils from different parent rocks on the growth of Gleditsia sinensis young trees

采用实验生态学的方法对6种不同岩性发育的土壤对皂荚生长的影响进行了研究,结果表明:皂荚在灰质白云岩发育的土壤中生长状况最好,第3年树高可达209.3cm,最差为石英砂岩发育的土壤中情况,树高仅100.6cm,并且这种差异随时间越长越明显;地茎的生长与高生长规律一致,但变化幅度没有高生长的大;高、径生长的差异也反映在生物量上有差异,3年生皂荚的生物量,以灰质白云岩发育的土壤中最大为382.61g,石英砂岩发育的土壤中情况最差,生物量仅为170.69g。这一结果可指导黔中喀斯特地区进行森林植被恢复及树种选择。

The relationship between soils from 6 different parent rocks and the growth of Gleditsia sinensis was studied, using the method of experimental ecology. The results showed that the G. sinensis grew best on the limy dolomite with a 209.3 cm high after three years ,but poorly grew on the quartzy sandstone with only a height of 100.6 cm. The difference was 2. 08 times,and became more and more obvious with the time change. The principles of growth in diameter and height were consistent, but the extent of change was not as large as the height growth. The difference of height and diameter growth also presented a difference of biomass on these soils. The biomass of G. sinensis at three years old reached 382.61g on the limy dolomite, and the poor was only 170. 69g on the quartzy sandstone. It showed a difference of 2. 2 times. This result provided the theory basis for forest vegetation restoration and tree selection in Karst region of Guizhou province.