胡杨(Populus euphratica)与柽柳(Tamarix ramosissima)径向生长特征对比  

Comparison of Intra-annual Stem Radial Growth Characteristic between Populus euphratica and Tamarix ramosissima

作　　者：田全彦 肖生春[1] 彭小梅[1] 肖洪浪[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《中国沙漠》2015年第6期1512-1519,共8页Journal of Desert Research

基　　金：国家自然科学基金面上项目(41471082;40971032)

摘　　要：基于对额济纳旗胡杨(Populus euphratica)和柽柳(Tamarix ramosissima)生长季树干的径向生长变化监测,以及气温、空气相对湿度和地下水位等环境因子的同步监测,利用突变检验和相关分析方法,对两树种日-季节尺度径向生长时间节点、阶段等特征及其环境因子响应模式进行了对比研究。结果显示:在两树种径向生长变化特征方面,日尺度上,胡杨每日径向生长最大值点出现和结束时间均比柽柳早3h左右;季节尺度上,胡杨进入快速生长阶段的时间迟于柽柳,并且比柽柳结束要早,持续时间短于柽柳。在环境响应机制方面,胡杨日收缩极值(eMDV)、日膨胀极值(iMDV)和日净生长量(ΔR)阶段变化平均值为柽柳的3倍以上,变化幅度也相对较大;两树种上述径向生长参数与气温和地下水埋深等因子日-季节尺度的响应模式基本一致,快速生长期的地下水位变化影响更为显著,尤其对于柽柳。研究结果对于荒漠河岸林可持续发展及内陆河流域水资源管理具有重要意义。Using the point-dendrometer,the stem radius variation of Populus euphratica and Tamarix ramosissima were measured during the growing season,in Ejina Oasis,arid northwest China.The environmental factors,such as air temperature,relative air humidity and groundwater level,were monitored synchronously.Using the Regime Shift Detection,different growing phrases of the two species were detected.The relationship between the environmental factors and the diurnal stem radial variation was investigated through correlation analysis.The results showed that,the time of P.euphratica reached the start and the end of daily maximum value were 3 hours earlier than T.ramosissima.The time of P.euphratica entered the rapid growth phase was later than T.ramosissima,and the ending time was earlier.The mean value of eMDV,iMDV andΔRof P.euphratica were 3times larger than T.ramosissima,and the amplitudes of the three parameters were larger for P.euphratica.It is similar of the relationship between those three parameters of the two species and the environmental factors.A more significant correlation has been found between the groundwater level and the three parameters in rapid growth phase,especially for the T.ramosissima.The research results have significant implications for the sustainable development of desert riparian forests and the water resources management in the inland river basin.

关 键 词：胡杨(Populus euphratica) 柽柳(Tamarix ramosissima) 日-季 

分 类 号：S792.11[农业科学—林木遗传育种] S793.5[农业科学—林学]