24种连蕊茶在夏季极端高温干旱条件下的耐旱潜力评价

Evaluation of Potential Drought-resistance for 24 Species in Sect. Theopsis under Extreme High Temperature and Drought in Summer

2013年6-9月．华东地区发生的极端高温干旱给园林植物的生长造成了严重影响。通过田间旱害调查及相关生理指标测定．采用叶片耐旱指数和生理指标的平均隶属函数值聚类分析方法．对浙江省金华市国际山茶物种园连蕊茶组（Sect．Theops括1的24个种进行了耐旱潜力综合评价。结果表明：24种连蕊茶的耐旱潜力可分为强、较强、中等及弱4类，其中第一类耐旱潜力强，包括小卵叶连蕊茶、七瓣连蕊茶、长尖连蕊茶、贵州连蕊茶、大萼连蕊茶；第二类耐旱潜力较强，包括细萼连蕊茶、微花连蕊茶、黄杨叶连蕊茶、尖连蕊茶、岳麓连蕊茶、小长尾连蕊茶、钟萼连蕊茶、蒙自连蕊茶、川鄂连蕊茶、长管连蕊茶、大花尖连蕊茶；第三类耐旱潜力中等。包括荔波连蕊茶、披针萼连蕊茶、细叶连蕊茶、肖长尖连蕊茶、柃叶连蕊茶、细尖连蕊茶；第四类为耐旱潜力弱，包括毛花连蕊茶、川滇连蕊茶。

Ornamental plants in the East China were seriously affected by the extreme high temperature and long drought period from June to September in 2013. In this experiment, 24 12-year-old species from Sect. Theopsis in the Jinhua International Camellia Species Garden were evaluated for their potential of drought-resistance through the field investigation and 4 relevant physiological index analysis. The results showed that 24 species could be classified into 4 categories based on the drought-resistance, the first category with strong drought- resistance including C. parvi-ovata, C. septempetala, C. acutissima, C. costei, and C. macrosepala; the second category is drought-resistance including C. tsofui, C. minutiflora, C. buxifolia, C. cuspidata, C. handelii, C. parvicaudata, C. eampanisepala, C. forrestii, C. rosthorniana, C. elongata and C. cuspidata var. grandiflorac; the third category to moderate drought-resistance including C. lipoensis, C. lancicalyx, C. parvilimba, C. subacutissima, C. euryoides and C. parvicuspidata; while the fourth category with weaker drought-resistance including C. fraterna and C. tsa/i, on the basis of comprehensive evaluation.