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首页> 外文期刊>Plant and Soil >UPTAKE OF SALINE GROUNDWATER BY PLANTS - AN ANALYTICAL MODEL FOR SEMI-ARID AND ARID AREAS
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UPTAKE OF SALINE GROUNDWATER BY PLANTS - AN ANALYTICAL MODEL FOR SEMI-ARID AND ARID AREAS

机译：植物对地下水的吸收-半干旱和干旱地区的分析模型

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An analytical model, based on unsaturated zone water and solute balances, was developed to describe the uptake of saline groundwater by plants in dry regions. It was assumed that: i. initially, the profile had low water and salt contents to some depth; ii. both water and solutes move upwards from the water table by piston flow due only to plant water extraction; iii, the uptake of water concentrates solutes in the soil solution until some threshold salinity is reached, above which plants can no longer extract water due to osmotic effects; iv. uptake of the groundwater does not affect the water table level; and v. uptake of groundwater is only limited by transmission of groundwater through the soil, Model predictions were compared with measurements of groundwater uptake made over 15 months at five sites in a Eucalyptus forest in a semi-arid area, using independently measured model parameters. Depth and salinity of groundwater, and soil type varied greatly between sites. Predicted groundwater uptake rates were close to measured values, generally being within similar to 0.1 mm day(-1). Sensitivity analysis showed that groundwater depth and salinity were the main controls on uptake of groundwater, while soil properties appeared to have a lesser effect. The model showed that uptake of groundwater would result in complete salinisation of the soil profile within 4 to 30 yr at the sites studied, unless salts were leached from the soil by rainfall or flood waters. However, a relatively small amount of annual leaching may be sufficient to allow groundwater uptake to continue. Thus groundwaters, even when saline, may be important sources of water to plants in arid and semi-arid areas.
机译：建立了基于不饱和带水和溶质平衡的分析模型，以描述干旱地区植物对盐分地下水的吸收。假定：i。最初，剖面中的水和盐含量较低，达到一定深度; ii。水和溶质都仅通过植物水提取而通过活塞流从地下水位向上移动; iii。吸收水分使溶质浓缩在土壤溶液中，直到达到一定的盐度阈值为止，在此阈值以上，植物由于渗透作用不能再提取水; iv。吸收地下水不影响地下水位; v。地下水的吸收仅受地下水通过土壤的传输的限制，使用独立测量的模型参数，将模型预测与在半干旱地区的桉树森林中五个地点超过15个月的地下水吸收测量值进行了比较。地点之间的地下水深度和盐度以及土壤类型差异很大。预测的地下水吸收率接近测量值，通常在0.1毫米天（-1）之内。敏感性分析表明，地下水深度和盐度是控制地下水吸收的主要控制因素，而土壤特性似乎影响较小。该模型表明，在所研究的地点，地下水的吸收将导致土壤剖面完全盐化，除非盐因降雨或洪水从土壤中浸出。但是，每年较少的淋洗量足以使地下水持续吸收。因此，即使在盐水中，地下水也可能是干旱和半干旱地区植物的重要水源。

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