【摘要】 基于国际冻原计划(ITEX)模拟增温效应对植物影响的研究方法,将温棚按从小到大的顺序设为A、B、C、D、E 5个梯度水平,研究了矮嵩草(Kobresia humilis)植株的分蘖数、叶片数、高度、生物量以及重要值对温度升高的响应。结果表明:温度(地表温度和地温)随温棚的减小而升高,最高的A温棚内地表温度和地温分别比对照提高2.35℃和2.13℃;分蘖数在E温棚中增加最多,且分别与B、A温棚间差异分别达到显著水平和极显著水平,A~E温棚间分蘖数的变化与棚内温度呈负相关,且与地温呈显著相关;叶片数的变化趋势与分蘖数一致,A~E温棚间叶片数与温度呈极显著负相关;叶片高度随温度的增加而升高,A温棚极显著高于E温棚和对照,处理间叶片高度变化与温度呈极显著正相关;生物量、重要值与温度呈显著负相关。更多还原

【Abstract】 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.更多还原