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The gas exchange characteristics of four shrubs on the northern slope of Kunlun Mountain
Authors
张希明
朱军涛
+3 more
李向义
杨尚功
林丽莎
Publication date
15 December 2011
Publisher
Abstract
在自然条件下对昆仑山北坡4 种灌木塔里木沙拐枣( Calligonum roborowasikii) 、驼绒藜( Ceratoides latens) 、合头草( Sympegma regelii) 和昆仑绢蒿( Seriphidium korovinii) 的气体交换、水势的季节变化特征及生长季末δ13 C 值进行了比较研究。 结果表明: 驼绒藜、塔里木沙拐枣和合头草气体交换日变化为单峰曲线,昆仑绢蒿为双峰曲线; 其中塔里木沙拐枣属高光合、高蒸腾型,水分利用效率最高; 合头草属低光合、低蒸腾型; 驼绒藜属高光合、低蒸腾型; 昆仑绢蒿属低光合、高蒸腾,水分利用效率最低。驼绒藜光合速率8 月日变化, 10: 00 - 12: 00,16: 00—20: 00 两个时段,Pn下降,主要决定因素均为非气孔因素。沙拐枣6月光合速率日变化, 12: 00 - 14: 00 时,Pn 下降,主要受气孔导度因素影响; 16: 00 - 20: 00 时,Pn下降,可能是同时受气孔和非气孔因素的影响。从耐旱机理可以将4 种灌木归类: 塔里木沙拐枣和昆仑绢蒿属于高水势延迟脱水耐旱机理; 驼绒藜和合头草属于低水势忍耐脱水机理。用δ13C 表征植物水分利用效率时,只有部分物种有很好的一致性
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Last time updated on 29/11/2016