CAJ | 학술논문

在盆栽条件下，研究调亏灌溉对小桐子幼树形态特征与水分利用的影响。设置2种调亏水平：重度亏缺W1（田间持水量的25％～45％）和轻度亏缺W2（田间持水量的45％～65％）；3种亏水处理时间：D1（亏水120 d ）、D2（亏水90 d ）和D3（亏水60 d ）；CK为常规灌溉（田间持水量的65％～85％）。结果表明：亏水度对小桐子幼树的株高、茎粗、壮苗指数、叶面积、基茎截面积、干物质质量和水分利用效率的影响趋势表现为轻度调亏处理＞重度调亏处理；对根冠比和胡伯尔值的影响趋势表现为：重度调亏处理＞轻度调亏处理。亏水时间对小桐子幼树的株高、茎粗、壮苗指数、叶面积、基茎截面积、干物质质量和水分利用效率的影响趋势表现为60 d＞90 d＞120 d；对根冠比和胡伯尔值的影响趋势均表现为120 d＞90 d＞60 d。与正常灌水相比，轻度调亏60 d的处理节约灌溉用水11．2％，其叶干重和叶柄干重显著下降，根系、茎秆和总干重下降并不明显，而粗高比和根冠比显著提高，因此，灌溉水利用效率和壮苗指数显著增加7．8％和8．1％。可见，苗后期轻度亏水不仅具有明显的壮苗作用，而且促进水分利用效率显著增大。
재분재조건하，연구조우관개대소동자유수형태특정여수분이용적영향。설치2충조우수평：중도우결W1（전간지수량적25％～45％）화경도우결W2（전간지수량적45％～65％）；3충우수처리시간：D1（우수120 d ）、D2（우수90 d ）화D3（우수60 d ）；CK위상규관개（전간지수량적65％～85％）。결과표명：우수도대소동자유수적주고、경조、장묘지수、협면적、기경절면적、간물질질량화수분이용효솔적영향추세표현위경도조우처리＞중도조우처리；대근관비화호백이치적영향추세표현위：중도조우처리＞경도조우처리。우수시간대소동자유수적주고、경조、장묘지수、협면적、기경절면적、간물질질량화수분이용효솔적영향추세표현위60 d＞90 d＞120 d；대근관비화호백이치적영향추세균표현위120 d＞90 d＞60 d。여정상관수상비，경도조우60 d적처리절약관개용수11．2％，기협간중화협병간중현저하강，근계、경간화총간중하강병불명현，이조고비화근관비현저제고，인차，관개수이용효솔화장묘지수현저증가7．8％화8．1％。가견，묘후기경도우수불부구유명현적장묘작용，이차촉진수분이용효솔현저증대。
A pot-grown experiment was conducted to investigate the effects of regulated deficit irrigation on morpho-logical characteristics and water use of Jatropha curcas L .Two water deficit levels were set as severe water deficit W1 (soil moisture maintained at 25% ~45% of field capacity ) and moderate water deficit W2 (soil moisture maintained at 45% ~65% of field capacity ) and three water deficit time levels (D1:120 d ,D2:90 d ,and D3:60 d ) were designed in the study .Control treatment was full irrigation (soil moisture maintained at 65% ~85% of field capacity ) .Results showed that effects of light water deficiency were more apparent than those of severe water deficiency on plant height , stem diameter ,healthy index of seedlings ,total leaf area ,xylem cross-sectional area of basal shoot ,total dry mass ,and water use efficiency of Jatropha curcas L .However ,severe water deficit level seemed to have affected the root-shoot ratio and Huber value of Jatropha curcas L .more than light water deficit level .Effects of water deficit time on plant height , stem diameter ,healthy index of seedlings ,total leaf area ,xylem cross-sectional area of basal shoot ,total dry mass ,and water use efficiency of Jatropha curcas L .were in the following order:60 d>90 d>120 d .Additionally ,effects of wa-ter deficit time on root-shoot ratio and Huber value of Jatropha curcas L .were as 120 d>90 d>60 d .Compared with the control ,W2D3 treatment saved irrigation water by 11 .2% ,leaf and petiole dry mass were significantly reduced ,and root ,stem ,and total dry mass dropped slightly .Nevertheless ,base stem diameter-plant height ratio and root-shoot ratio became significantly increased .As a result ,irrigation water use efficiency and healthy index of sapling were significantly increased to 7 .8% and 8 .1 .% ,respectively .It is clear that light water deficit level t the late stage of seedling develop-ment not only increased the healthy index ,but significantly promoted water use efficiency .