摘要
采用对数正态分布模型,基于2006年黑河下游的野外实测数据,建立了研究区胡杨和柽柳植被盖度与地下水埋深的模型,并模拟了研究区的潜在植被.结果表明:黑河下游胡杨的最适宜地下水位和平均地下水位分别为2.6和3.6m,柽柳则分别为2.0和3.0m;胡杨的高盖度分布区主要集中在河道两侧的区域,而柽柳则可以在研究区的大部分区域以较高的盖度生存,对于研究区当前的地下水埋深而言,柽柳应该是最适宜生存的物种之一;研究区胡杨和柽柳的潜在植被空间分布与现状分布的相似性分别为43.4和55.6,导致相似程度不高的主要原因为土壤中存在的石膏盐盘层阻碍了土壤水分的垂直运动.
Based on the 2006 investigation data in lower reaches of Heihe River, and by using loga- rithmic normal distribution model, the models about the vegetation cover of Populus euphratica and Tamarix ramossima and the groundwater level in study area were built, and the potential plant of the study area was simulated. The results showed that in the lower reaches of Heihe River, the optimal groundwater level and mean groundwater level for P. euphratica were 2.6 m and 3.6 m, and those for T. ramossima were 2.0 m and 3.0 m, respectively. The high cover P. euphratica distribution area was mainly concentrated in the near-banks of Donghe River and Xihe River, while higher cover T. ramossima was distributed in most parts of the study area. From the aspect of current groundwater level, T. ramossima should be the adaptive species in the study area. The similarities between the potential and actual spatial distribution of P. euphratica and T. ramossima were 43.4% and 55.6%, respectively, and the main reason for the lower similarity was that there existed a gypsum salt pan in soil, which blocked the vertical movement of soil water.
出处
《应用生态学报》
CAS
CSCD
北大核心
2008年第12期2687-2692,共6页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(40671067
30770387)
中国科学院寒区旱区环境与工程研究所冰川学冻土学特殊学科点资助项目(J0630966)
关键词
黑河下游
地下水波动带
地下水位
潜在植被
胡杨
柽柳
lower reaches of Heihe River
water table fluctuant beh
groundwater level
potentialplant
Populus euphratica
Tamarix ramossima.
