CAJ | 학술논문

对塔克拉玛干沙漠--绿洲过渡带骆驼刺(Alhagi sparsifolia Shap.)水分关系的研究表明:骆驼刺在夏季保持了正的膨压,一直较高较稳定的清晨水势说明植物水分恢复状况良好,植物得到了较好的水分供应;在7月,干旱胁迫造成的水分亏缺并未影响植株正常的蒸腾作用,因而干旱引起的水分胁迫并未威胁到植被的存在.骆驼刺对干旱胁迫的水分生理适应主要体现在叶水平上,表现为饱和枝条的渗透势(Πo)和膨压消失点的渗透势(Πp)的差值(ΔΠ)和相对含水量(RWC)在膨压消失点间更大的变化、渗透调节的产生、较高较稳定的饱和枝条水分与干物质之比(WCsat)和膨压消失点的相对含水量(RWCp),以及较低的共质体水在总水分中的相对含量(RWCsym).但形态学上的特征,主要表现为深而发达的根系和蒸腾面积的减少,才是骆驼刺适应极端干旱环境的主要途径.非定期的夏季一次性灌溉对地下水位很低地区的骆驼刺植被水分状况的恢复没有帮助.
대탑극랍마간사막--록주과도대락타자(Alhagi sparsifolia Shap.)수분관계적연구표명:락타자재하계보지료정적팽압,일직교고교은정적청신수세설명식물수분회복상황량호,식물득도료교호적수분공응;재7월,간한협박조성적수분우결병미영향식주정상적증등작용,인이간한인기적수분협박병미위협도식피적존재.락타자대간한협박적수분생리괄응주요체현재협수평상,표현위포화지조적삼투세(Πo)화팽압소실점적삼투세(Πp)적차치(ΔΠ)화상대함수량(RWC)재팽압소실점간경대적변화、삼투조절적산생、교고교은정적포화지조수분여간물질지비(WCsat)화팽압소실점적상대함수량(RWCp),이급교저적공질체수재총수분중적상대함량(RWCsym).단형태학상적특정,주요표현위심이발체적근계화증등면적적감소,재시락타자괄응겁단간한배경적주요도경.비정기적하계일차성관개대지하수위흔저지구적락타자식피수분상황적회복몰유방조.
Water relations of Alhagi sparsifolia Shap. at the transition zone between oases and sandy desert were studied in the southern fringe of Taklamakan Desert. Results showed that A. sparsifolia maintained the positive turgor during the summer. The steady high predawn water potential (ψP) indicated A. sparsifolia had sufficient hydration and water supply in growing season. In July, water deficit caused by drought stress had no effect on the transpiration of A. sparsifolia. Therefore, drought stress is not a main factor affecting the survival of plants. The physiological adaptation to drought of A. sparsifolia was shown mainly at the leaf level by significant difference (ΔΠ) and relative water content (RWC) between the osmotic pressure at full turgor and at turgor loss, by occurring of osmotic adjustment, by high percentage of dry mass-related water content (WCsat), by RWC at turgor loss point (RWCp) in stable level and low RWC of the saturated symplast (RWCsym). However, the morphological features of transpiring surface reduction and deep root system seem to be the main way for the plant to adapt to the extreme drought environment. Result also suggests that one time of irregular irrigation in summer will not be helpful to recover water status of A. sparsifolia in location where the water table is very low.