CAJ | 학술논문

采用盆栽控水的方法,研究了不同程度干旱胁迫对麻疯树幼苗叶片光合特性及植株生长的影响.结果表明:麻疯树幼苗叶片相对含水量(LRWC)、苗高生长量(△H)、地径生长量(△D)、净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)均随胁迫时间的增加而下降;水分利用效率(WUE)在轻度和中度干旱胁迫下升高,重度干旱胁迫下极显著降低(P<0.01);胞间CO_2浓度(C_i)在轻度和中度干旱胁迫下有所降低,重度干旱时极显著上升(P<0.01).说明在轻度和中度干旱胁迫下麻疯树幼苗光合能力下降的主要原因是气孔限制,而重度干旱胁迫下光合能力下降的主要原因是非气孔限制.在轻度和中度干旱时麻疯树幼苗以降低光合生长和蒸腾耗水、提高水分利用效率来适应环境、维持生命,但长势变弱,而严重干旱时麻疯树幼苗的生长受到土壤水分的严重限制.
채용분재공수적방법,연구료불동정도간한협박대마풍수유묘협편광합특성급식주생장적영향.결과표명:마풍수유묘협편상대함수량(LRWC)、묘고생장량(△H)、지경생장량(△D)、정광합속솔(Pn)、기공도도(Gs)화증등속솔(Tr)균수협박시간적증가이하강;수분이용효솔(WUE)재경도화중도간한협박하승고,중도간한협박하겁현저강저(P<0.01);포간CO_2농도(C_i)재경도화중도간한협박하유소강저,중도간한시겁현저상승(P<0.01).설명재경도화중도간한협박하마풍수유묘광합능력하강적주요원인시기공한제,이중도간한협박하광합능력하강적주요원인시비기공한제.재경도화중도간한시마풍수유묘이강저광합생장화증등모수、제고수분이용효솔래괄응배경、유지생명,단장세변약,이엄중간한시마풍수유묘적생장수도토양수분적엄중한제.
Water-controlling pot experiment was carried out to study the effects of drought stress on photosynthetic characteristic and growth of Jatropha curcas L.seedlings. The results showed that leaf relative water content (LRWC), height growth (△H), basal diameter growth (△D), net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) were decreased with the increment of stress time. The water use efficiency (WUE) was increased under mild and moderate drought stress, and dramatically reduced under severe drought stress. The intercellular CO_2 concentration (C_i) was decreased under mild and moderate drought stress, and markedly increased under severe drought. This indicated that the decrease of photosynthetic capacity of J.curcas L.seedling under mild and moderate drought stress is mainly due to stomatal limitation, while that under severe drought stress is mainly due to non-stomatal limitation. J.curcas L.seedling could accommodate mild and moderate drought stress environment and sustain life by decreasing Pn and Tr, and increasing WUE, and the growth became weaker on those conditions;however, it could be seriously limited by soil moisture under severe drought stress.