摘要
为了阐明丘陵沟壑区人工刺槐林群落不同植物水分利用机制的多样性及其与群落稳定性关系,以延安宝塔区公路山半阴坡刺槐林为研究对象,选择林内12种优势植物,并在林外选择相同植物。在植物生长旺盛期,系统地测定水分平衡参数(叶片水势、水分饱和亏缺、临界水分饱和亏缺等),通过对不同植物的水分参数的比较研究,结果表明:1)在林内、林外不同生境下,12种植物水势日变化曲线一致,但为了适应变化的环境,其水分参数都要进行调整。水分参数在相似生境下不同,在生境条件变化后也不同。2)根据不同植物黎明前水势、日最低水势、水分饱和亏缺等水分参数,利用聚类分析方法,将林内12种优势植物划分成4个水分适应类型,每一种植物均有其特殊的水分适应机制。
In order to clarify the relationship between community stability and diversity of water-using mechanism of various plants in Robinia pseudoacacia community in hilly and gully region during the vigorous growth period, an experiment was conducted to compare and analyze the water relation parameters （water potential, the natural water saturation deficiency, and the critical water saturation deficiency）of 12 dominant plants of R. pseudoacacia forests distributed on shade and semi-shade hillside in Yan＇an Gonglu Mountain. The results were as follows： （1） the daily changes of water potential of the same plant inside and outside in forest were almost the same among of 12 dominant species, but the absolute values of water parameter of the same plant species measured at the same time were different inside and outside the forest, indicating the ability of environmental adaption, and the water parameters were different both in similar habitats and different habitats; （2） strategies of the 12 dominant species were divided into 4 types by cluster analysis which identified significant patterns associated with 4 water parameters and responses in the forest. Each of these strategy types had a distinct water balance mechanism and parameter adjusting pat- tern.
出处
《西北林学院学报》
CSCD
北大核心
2011年第1期27-34,共8页
Journal of Northwest Forestry University
基金
国家十一五科技支撑课题(2006BAD09B03):植被优化配置与可持续建设技术
中科院科学院西部行动计划项目:黄土高原水土保持与可持续生态建设试验示范研究(KZCX2-XB2-05)
关键词
延安宝塔区
刺槐
优势种
水分生理
Baota District in Yan＇an
Robinia pseudoacacia
dominant species
water physiology
