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中文摘要：
以库尔勒香梨为试材,设置高温干旱、灌水、喷水3个处理,研究高温和干旱对库尔勒香梨光合特性和叶绿素含量的影响。结果表明：高温干旱条件下库尔勒香梨叶片的净光合速率变化呈＂双峰型＂,受气孔限制且有＂午休＂现象;蒸腾速率和气孔导度变化趋势相同,呈凹型;细胞间二氧化碳浓度可能受净光合速率的影响呈现出中午降低的趋势。灌水处理下库尔勒香梨叶片的净光合速率变化呈＂单峰型＂;蒸腾速率与气孔导度变化趋势一致;细胞间二氧化碳浓度变化幅度较小,可能是由于气孔发生了不均匀关闭。高温干旱处理导致库尔勒香梨叶片的叶绿素a、叶绿素b、叶绿素的总含量降低。而灌水和喷水处理,则显著提高了叶绿素的含量。
英文摘要：
Taking Korla fragrant pear as materials,the effect of high temperature and drought on photosynthetic characteristics and chlorophyll content in Korla fragrant pear were measured under different treatments,including high temperature and drought,watered,sprayed.The results showed that the variation curve of Korla fragrant pear leaf net photosynthetic rate presented double-apex with a phenomenon of photosynthetic‘noon breaking＇and stomatal limitation in the high temperature and drought condition.The variation curves of stomata conductance and transpiration rate showed the same,which displayed a hollow pattern.The variation curves of intercellular CO2 may be influenced by the net photosynthetic rate showed a decreasing trend at noon.The variation curve of Korla fragrant pear leaf net photosynthetic rate presented single-apex in the watered condition.The variation curves of stomata conductance and transpiration rate showed the same.The variation curves of intercellular CO2 appeared smaller changed which may be influenced by stomatal occurred uneven.High temperature and drought trees led to a prominent drop in the contents of Chl a,Chl b and Chl a＋b.In a word,the watered and sprayed treatment could improve the chlorophyll content.
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