| 干旱胁迫条件下胡杨茎流与茎直径变化分析——以塔里木河下游英苏断面为例 |
| |
| 引用本文： | 何斌,李卫红,陈永金,徐长春,袁素芬,陈亚宁.干旱胁迫条件下胡杨茎流与茎直径变化分析——以塔里木河下游英苏断面为例[J].干旱区地理,2007,30(2):223-230. |
| |
| 作者姓名： | 何斌 李卫红 陈永金 徐长春 袁素芬 陈亚宁 |
| |
| 作者单位： | 中国科学院新疆生态与地理研究所,新疆,乌鲁木齐,830011 |
| |
| 基金项目： | 中国科学院知识创新项目，国家自然科学基金(90502007,30500081)资助 |
| |
| 摘 要： | 应用先进的PHYTALK植物生理生态监测系统对塔里木河下游英苏断面胡杨的茎流、相关环境因子以及茎直径的日变化进行了监测。结果表明:在极端干旱区塔里木河下游的胡杨茎流日变化表现多峰值,且夜晚仍保持一定流速;茎流变化受太阳辐射、风速和大气温度影响明显,而其它环境因子如空气湿度、土壤湿度等影响则不大;同时,日变化中,不同时段起主导作用的因子不尽相同。胡杨茎直径对植株水分状况响应灵敏,夜晚植株组织含水充足,茎直径相对较大,白天植株失水,茎直径减小;胡杨随着干旱胁迫程度的增加,茎直径日最大值和最小值都显明显下降趋势。
|
| 关 键 词： | 胡杨 茎流 茎直径 干旱胁迫 塔里木河 |
| 收稿时间： | 2006-07-12 |
| 修稿时间： | 2006-11-09 |
Variation of sap flow and stem diameter under drought stress——A case study Yingsu Section |
| |
| HE Bin,LI Wei-hong,CHEN Yong-jin,XU Chang-chun,YUAN Su-fen,CHEN Ya-ning.Variation of sap flow and stem diameter under drought stress——A case study Yingsu Section[J].Arid Land Geography,2007,30(2):223-230. |
| |
| Authors: | HE Bin LI Wei-hong CHEN Yong-jin XU Chang-chun YUAN Su-fen CHEN Ya-ning |
| |
| Institution: | Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences, Urumqi 830011, Xinjiang , China |
| |
| Abstract: | The sap flow rate of Populus euphratica,relative environmental factors and the variation of stem diameters have been observed for 3 days at Yingsu in the lower reaches of Tarim river with advanced PHYTALK system.The results showed the following regularities: the diurnal variation of sap flow rate of Populus euphratica appears multi-peaks;there is still sap flow in night;the net radiation,air temperature and wind speed play critical role to affect sap flow;however,soil humidity and air humidity have minor influence on it;furthermore,during the diurnal variation of sap flow,different periods have different determinants;the variation of stem diameters could respond sensitively to plant moisture content condition;the water of plant tissue is abundant at night but scarce at daytime,accordingly the stem diameter is thicker at night than at daytime;moreover,the maximum and minimum of stem diameter decreased during drought period. |
| |
| Keywords: | Populus euphratica sap flow stem diameter drought stress the Tarim river |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
