CAJ | 학술논문

应用部分根区干燥(PRD)技术,研究分根交替灌水(APRI)、分根固定灌水(FPRI)与全根系均匀灌水(BPRI)对盆栽棉花的生长、光合和水分利用效率的影响.结果表明:APRI黎明前与正午的叶水势均明显高于FPRI,而与BPRI无显著差异.APRI在叶片水分状况未变化时,显著降低了气孔导度,在维持光合作用不变的情况下,减少蒸腾量,瞬时水分利用效率与FPRI和BPRI相比分别提高了35.86%和63.51%.APRI处理的棉株在干旱复水后由于补偿效应,叶片生长速率和总叶面积较同等灌水量的FPRI分别提高了67.42%和27.16%.同时,干湿交替刺激APRI处理棉株的吸收根生长,其干重是FPRI的1.39倍.分根交替灌水在节水50%条件下,比同水量固定灌水处理的水分利用效率显著提高.
응용부분근구간조(PRD)기술,연구분근교체관수(APRI)、분근고정관수(FPRI)여전근계균균관수(BPRI)대분재면화적생장、광합화수분이용효솔적영향.결과표명:APRI려명전여정오적협수세균명현고우FPRI,이여BPRI무현저차이.APRI재협편수분상황미변화시,현저강저료기공도도,재유지광합작용불변적정황하,감소증등량,순시수분이용효솔여FPRI화BPRI상비분별제고료35.86%화63.51%.APRI처리적면주재간한복수후유우보상효응,협편생장속솔화총협면적교동등관수량적FPRI분별제고료67.42%화27.16%.동시,간습교체자격APRI처리면주적흡수근생장,기간중시FPRI적1.39배.분근교체관수재절수50%조건하,비동수량고정관수처리적수분이용효솔현저제고.
In this experiment, using partial root-zone drying technique (PRD) with pot-grown cotton plants, we compared the plant growth, photosynthesis and water use efficiency with water stress under alternative partial root-zone irrigation (APRI),fixed partial root-zone irrigation (FPRI), and both partial root-zone irrigation (BPRI). It was found that the pre-dawn and midday leaf water potential in APRI and BPRI were approximately same, but higher than that in FPRI. Furthermore, the stomatal conductance in APRI decreased without obvious change in leaf water status, and transpiration rate declined significantly without much reduction in photosynthetic rate, therefore the photosynthesis water use efficiency improved by 35.86% and 63.51% respectively, as compared to that in FPRI and BPRI treatments. The results also revealed that the leaf growth rate and total leaf area in APRI increased by 67.42% and 27.16%, respectively, compared to that in FPRI at the same irrigation levels according to compensating effects. Further analysis revealed that cotton developed more feeder roots in APRI by using dry-wet alternative irrigation method, the dry mass of feeder roots improved 1.39 times compared to that of FPRI. With 50% reduction of water amount, APRI significantly improved the water use efficiency than FPRI.