论文部分内容阅读
地下水是干旱区天然植被耗水的主要来源,通过潜水蒸发来研究天然植被的生态需水是一条有效的途径．为了研究塔里木河流域的生态需水,根据1989-1996年阿克苏水平衡站裸地潜水蒸发资料,分析了潜水蒸发、潜水埋深和水面蒸发的关系,以潜水蒸发极限强度为控制条件,以潜水蒸发与水面蒸发呈非线性关系这一客观规律为基础,建立了充分反映潜水蒸发规律的裸地潜水蒸发计算模式．根据2003-2004年柽柳生长条件下纯粹由蒸散发引起潜水位下降时期潜水埋深和土壤水分资料,计算了柽柳生长条件下的潜水蒸发量,建立了柽柳生长条件下潜水蒸发计算模型．以柽柳植被系数为纽带,可实现裸地和柽柳生长条件下潜水蒸发的互换计算．研究结果表明所建模型计算精度较高,适用于塔里木河流域．
Groundwater is the main source of water consumption of natural vegetation in arid regions. It is an effective way to study the ecological water demand of natural vegetation by diving evaporation. In order to study the ecological water requirement in the Tarim River Basin, the relationship between submersion evaporation, submerged depth and water surface evaporation was analyzed according to the submarine groundwater evaporation data from 1989 to 1996 in Aksu Water Balance Station. Based on the objective law of non-linear relationship between evaporation and water surface evaporation, a model for calculating the phreatic water evaporation that fully reflects the law of evaporation is established. According to the data of submerged depth and soil moisture caused by evapotranspiration during the period of tamarix growth under tundra growth in 2003-2004, the phreatic water evaporation of tamarisk was calculated, and the calculation model of phreatic water evaporation was established. Taking the Tungliu vegetation index as a link, the interchange calculation of the submersion evaporation under bare soil and Tamarix can be realized. The results show that the proposed model has high calculation accuracy and is suitable for the Tarim River Basin.