驼绒藜属植物蒸腾作用的某些特征

采用快速称重法测定了驼绒藜属 ( Ceratoides)植物 3个种 5个生态型蒸腾速率和失水率叶片离体 1 2分钟内的连续变化。结果发现 ,分段蒸腾速率 ( STR)和分段失水率 ( SDR)表现为无规则律动模式 ,其变幅和节奏具有不可预知性 ;平均蒸腾速率 ( ATR)表现为曲率较小的相对平滑的抛物线。ATR的线性分布较好地体现出植物间蒸腾速率调节能力的差异。华北驼绒藜的 2个生态型和驼绒藜宁夏生态型蒸腾作用的调节能力较强 ,而来自新疆的心叶驼绒藜和驼绒藜新疆生态型调节能力则较弱。不同植物 ATR的线性参数对温度、相对湿度和光照强度的敏感性差异很大。

Some characteristics in transpiration of Ceratoides spp.

Successional transperation rates(TR) and dehydration ratios(DR) within 12 minutes after leaf detached were measured on of 5 ecotypes,3 Ceratoides species by way of weighting leaf instantly. It was showed that subsectional TR and DR (STR and SDR) presented a random variability, the range and rhythm could not be expected. Average TR(ATR) curves were comparatively smooth parabola and with a unimportant curvature. The differentiation among plants in controlling TR potential could be exhibited well by the distribution of ATR's linear equation. 2 ecotypes of C.arborescens and C. latens showed a stronger controlling performance, however, another 2 species, came from the Xinjiang Uygur Autonomous Region, showed a little infirmatory. The great differences of ATR' linear equation parameters among plants were occurred, in response to air temperature, relative humidity and light intensity.