CAJ | 학술논문

介绍了稳定氢、氧、碳同位素技术在定量区分植物水分来源及利用效率研究中的应用。以往大量研究结果表明，由于植物根系在吸收水分过程中没有发生同位素分馏，所以通过比较和分析植物木质部水分及其可利用水源的氢氧同位素δ值，就可以定量判断植物的水源；植物在光合作用过程中会产生碳同位素的分馏，从而使得植物叶片中的碳同位素组成能够成为指示植物水分利用效率的一个间接指标，是目前研究植物叶片长期水分利用效率的最佳方法；稳定同位素技术作为安全的示踪剂，有助于人类了解植物的生理生态功能，随着该技术的不断完善和研究的不断深入，同位素技术将会在生态学研究的许多领域得到广泛的应用。
개소료은정경、양、탄동위소기술재정량구분식물수분래원급이용효솔연구중적응용。이왕대량연구결과표명，유우식물근계재흡수수분과정중몰유발생동위소분류，소이통과비교화분석식물목질부수분급기가이용수원적경양동위소δ치，취가이정량판단식물적수원；식물재광합작용과정중회산생탄동위소적분류，종이사득식물협편중적탄동위소조성능구성위지시식물수분이용효솔적일개간접지표，시목전연구식물협편장기수분이용효솔적최가방법；은정동위소기술작위안전적시종제，유조우인류료해식물적생리생태공능，수착해기술적불단완선화연구적불단심입，동위소기술장회재생태학연구적허다영역득도엄범적응용。
This paper described the application of stable hydrogen,carbon and oxygen isotopes techniques in tracing sources of plant water and water use efficiency.Since the process that plant roots uptake water is non-frac-tionating,plant xylem water has the same composition of stable hydrogen and oxygen isotopes as soil water utilized by the plant.By analyzing the composition of hydrogen and oxygen isotopes of plant xylem water and potential sources of water,we could quantitatively determine the contributions of the sources to plants.For the study of water use efficiency,there were many researches showed that the composition of stable carbon isotopes of leaves can be an indirect indicator of plant water use efficiency.Photosynthesis is one of the most significant processes of carbon iso-tope fractionation in nature.So,stable carbon isotopes techniques had become the best way to study the long-term water use efficiency of plant leaves presently.As a safe tracer material,stable isotopes technique will help people to understand the plant’s ecophysiological process.Anyway,with the continuous improvement of techniques,sta-ble isotope techniques will be widely used in many areas of ecology.