文献类型：期刊文献

中文题名：变叶海棠及其伴生植物峨眉小檗的水分利用策略

英文题名：Water use strategies of Malus toringoides and its accompanying plant species Berberis aemulans

作者：徐庆[1] 王海英[1] 刘世荣[1]

第一作者：徐庆

机构：[1]中国林业科学研究院森林生态环境与保护研究所

年份：2011

卷号：31

期号：19

起止页码：5702-5710

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金资助项目(30771712;31170661);国家科技部"十一五"林业科技支撑资助课题(2006BAD03A04)

语种：中文

中文关键词：变叶海棠;峨眉小檗;氢稳定同位素;水分利用策略;降水

外文关键词：Malus toringoides; Berberis aemulans; hydrogen stable isotope; water utilization strategies; precipitation

分类号：S661.401.9

摘要：变叶海棠(Malus toringoides)是分布在我国四川省甘孜州炉霍县亚高山地区的野生植物种,其嫩叶可制茶,为一种纯正的天然保健珍品。它根系发达、抗逆性强,也是川西亚高山干旱地区退化植被生态恢复的良好树种。运用氢稳定同位素示踪技术,比较分析了变叶海棠和伴生植物峨眉小檗(Berberis aemulans)茎水与其潜在水源(降水、土壤水和河水)的δD值,结果表明:变叶海棠与峨眉小檗植物水主要来源于降水和深层土壤水。生长在河边的变叶海棠并不利用河水。在干季,降水10—20 mm后,变叶海棠对降水的利用率为33.50%—70.06%,而峨眉小檗为26.17%—45.17%;在雨季,降水10—25 mm后,变叶海棠对降水的利用率为40.64%—69.01%,而峨眉小檗为28.44%—71.41%;无论干季还是雨季,两种植物在雨后对降水利用的格局相似,但变叶海棠对降水的利用率皆显著高于峨眉小檗(P<0.01)。两种植物水分利用策略与其根系分布相一致。为川西甘孜州亚高山干旱地区退化植被生态恢复的树种选择以及变叶海棠的扩繁与利用提供科学理论依据。
Water is often the main limiting factor for plant growth in arid and semi-arid areas.Plants of different life-forms have different water use patterns and strategies,which reflect the balance and interrelationships between species characteristics and water distribution.These water use patterns and strategies may be subject to great variability in response to climate change.Malus toringoides is a native tree species of the sub-alpine arid areas in Luhuo County of Ganzi Region in Sichuan Provence.It is often used for ornamental horticulture because of its beautiful tree form,and for vegetation restoration along dry river valleys and south-facing hillsides in degraded ecosystem because of its well-developed root system and its drought tolerance to water-stressed conditions.M.toringoides also has other commercial values;its young new leaves can be processed to make tea with natural and green nutrients that can be used as health supplement.Berberis aemulans is a shallow root species and lives often in close association with M.toringoides as an accompanying species.The growth and reproduction of M.toringoides are increasingly affected by severe shortage of water in the arid area due to changing climate.Therefore,it is of importance to examine water use patterns of M.toringoides and Berberis aemulans.In this study,we used hydrogen stable isotope composition（δD） to examine water utilization pattern of M.toringoides and B.aemulans.Stable isotope techniques is considered as an effective tools to help understanding relationships between plants and their environment conditions and provides quantitative information about water use strategies and efficiencies of plants.By comparing δD value of water in xylem of M.toringoides and B.aemulans with potential water sources（rainfall,soil water,and river water）,the results showed that the water utilization source for M.toringoides and B.aemulans was mainly from rain water and soil water from deep layers of the soil profile.M.toringoides did not take up river water even though it grew on river banks.After a rain event of 10—20 mm in the dry season,M.toringoides had a precipitation utilization rate of 33.50%—70.06%,while B.aemulans was 26.17%—45.17%.After a rain event of 10—25 mm in the wet season,M.toringoides and B.aemulans had rain utilization rates of 40.64%—69.01% and 28.44%—71.41%,respectively.The results showed that the utilization rates of precipitation were not significantly different（P0.05） between the two seasons for either of the two plant species.After rain events,the water use patterns of M.toringoides and B.aemulans were similar regardless of the dry or wet season,and the utilization rate of precipitation of M.ertoringoides was significantly higher than that of B.aemulans（P0.01）.The water use patterns of M.toringoides and B.aemulans were consistent with the distribution patterns of their root systems： well-developed for M.toringoides and shallow for B.aemulans.Consequently,the two species can co-exist in the same vegetation communities.The results can contribute to in-depth understanding of growth,breeding and improvement,propagation of M.toringoides.In addition,we recommend that M.toringoides and B.aemulans be used together for ecological vegetation restoration by taking advantage of their co-beneficial water use strategies with different water sources.