| 塔里木河下游植被覆盖度变化与地下水质关系 |
| 摘要点击 2706 全文点击 2811 投稿时间：2009-04-11 修订日期：2009-07-25 |
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| 中文关键词 地下水质 覆盖度 胡杨 柽柳 塔里木河 |
| 英文关键词 groundwater quality vegetation coverage Populus euphratica tamarix ramosissima Tarim River |
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| 中文摘要 |
| 植被覆盖度的变化是地球内部作用与外部作用的共同结果，但在短期内主要受人类活动的影响.人类对自然植被覆盖度的影响最常见的就是通过对水分和水质状况的改变而影响植被覆盖度的变化.本研究基于2002～2007年间塔里木河下游地下水化学特征变化的监测资料和植被覆盖度的适时监测，探讨了植被覆盖度与地下水质之间的关系.结果表明,植被覆盖度在沿河道方向上，从A断面的>80%，下降到Ⅰ断面的不足10%;在垂直河道方向上表现为距离输水河道越近植被覆盖度越高的特点；地下水pH值也表现出沿河道方向从上段到下段，从距离河道近处向距离河道远处下降的变化趋势.回归分析发现，胡杨覆盖度随地下水pH值的升高而指数增加，柽柳覆盖度则随地下水pH值的增加而降低.胡杨和柽柳与地下水质的关系是造成胡杨主要分布于距离河道近处而柽柳则分布在远离河道处的因素之一. |
| 英文摘要 |
| The variations vegetation coverage is the result of conjunct effects of inner and outer energy of the earth,however,the human activity always makes the coverage of vegetation change a lot. Based on the monitoring data of chemistry of groundwater and the coverage of vegetation from 2002 to 2007 in the lower reaches of Tarim River, relations between vegetation coverage and groundwater chemistry were studied. It is found that vegetation coverage at Sector A was more than 80%,and decreased from sector to sector,the coverage of Sector Ⅰ was less than 10%. At the same sector, samples near to water source owned high coverage index,and samples far away from the river had low coverage index. The variations of pH in groundwater expressed similar regulation to vegetation coverage,that is, Sectors near the water source had higher pH index comparing than those far away. Regression between groundwater quality and vegetation coverage disclosed that the coverage of Populus euphratica climbed up along with increase of pH in groundwater,change of tamarix ramosissima coverage expressed an opposite trend to the Populus euphratica with the same environmental factors. This phenomenon can interpret spatial distribution of Populus euphratica and tamarix ramosissima in lower reaches of the Tarim River. |
