Effects of simulated greenhouse effect on growth characteristics of Kobresia humilis

The method that the International Tundra Experiment(ITEX) adopted to simulate greenhouse effect was adopted to study the responses of Kobresia humilis in tiller number,leaf number,plant height,and biomass and importance value to temperature increase by means of the greenhouses that have five sizes that were labeled A,B,C,D and E in the increasing order.It was shown that the temperatures(soil surface temperature and soil temperature) increased as the sizes of the greenhouses increased and Greenhouse A had the highest earth temperature and soil temperature,which were 2.35℃ and 2.13℃ higher than those in the control greenhouse,respectively;Greenhouse E had the highest tiller number,and significantly and extremely significantly differed in tiller number from Greenhouses B and E,respectively,and the changes among greenhouses A～E appeared negatively correlated with the temperatures in the greenhouses and correlated with the earth temperatures in the greenhouses;the leaf numbers varied in the same manner as the tiller numbers and the changes among greenhouse A～E appeared extremely significantly negatively correlated with the temperature in the greenhouses;the leaf height above ground increased as the temperature increased and the leaf height aboveground in Greenhouse A was extremely significantly higher than those in Greenhouse E and control greenhouse,and the change among the treatments appeared extremely significantly correlated with the temperatures in the greenhouses;the biomass,importance values appeared negatively correlated with the temperature.