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首页> 外文期刊>Soil Research >Deep drainage rates of Grey Vertosols depend on land use in semi-arid subtropical regions of Queensland, Australia
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Deep drainage rates of Grey Vertosols depend on land use in semi-arid subtropical regions of Queensland, Australia

机译：灰色Vertosols的深层排水速率取决于澳大利亚昆士兰州半干旱亚热带地区的土地利用

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Changes in land use can affect the soil water balance and mobilise primary salinity. This paper examines changes in soil chloride (Cl) and deep drainage under pasture and annual cropping on five gilgaied Grey Vertosols in southern inland Queensland, Australia, comparing them to remnant native vegetation. Transient soil Cl mass-balance (CMB) was used for crop and pasture sites, as it is suitable for determining the long-term, low rates of drainage since clearing some 40-50 years ago. Steady-state CMB was used for native vegetation.Large masses of salts and Cl were stored under native vegetation (31-103 t/ha of Cl to 3.2 m), and deep drainage was low (0.10-0.27 mm/year). The Cl profiles were generally of a normal shape for matrix flow (e. g. no bypass flow). Soil Cl was lost under cropping (average 65% lost to 1.4 m) and pasture (32%) compared with native vegetation. This lost Cl was not stored within the top 4-5m of soil, indicating movement of water below 4-5m. Deep drainage averaged 10 mm/year under cropping for both gilgai mounds and depressions (range 2.7-25 mm/year), and 3.3 and 5.1 mm/year under pasture for mounds and depressions, respectively. Subsoil (depth 1.5-4+ m) was generally dry under native vegetation and wetter under cropping and pasture. Deep drainage over the last 40-50 years was stored in the unsaturated zone (to deeper than 4+ m), indicating a long time lag between land-use change and groundwater response. Steady-state CMB greatly underestimated drainage for crop and pasture sites.
机译：土地利用的变化会影响土壤水分平衡并调动主要盐分。本文研究了澳大利亚昆士兰州南部内陆的五种镀银灰色Vertosols在牧场和一年生作物下土壤氯化物（Cl）和深层排水的变化，并将其与残留的原生植被进行了比较。暂时性土壤Cl质量平衡（CMB）用于作物和牧场，因为它适合于确定大约40至50年前的长期，低排水率。稳态CMB用于原生植被，大量盐和Cl被存储在原生植被下（31-103 t / ha的Cl至3.2 m），深层排水量低（0.10-0.27 mm /年）。对于基质流（例如，没有旁通流），Cl轮廓通常具有正常形状。与天然植被相比，耕作导致土壤Cl的流失（平均损失65％，至1.4 m）和牧场损失（32％）。失去的氯没有储存在土壤的最高4-5m内，表明水在4-5m以下移动。 gilgai丘和洼地的平均深水排水量为每年10毫米/年（范围为2.7-25 mm /年），而牧场和洼地的排水深度分别为3.3和5.1 mm /年。底土（深度1.5-4 + m）通常在天然植被下干燥，而在种植和牧场下则湿润。在过去的40至50年中，深层排水被存储在非饱和区（深度大于4 + m），这表明土地利用变化与地下水响应之间存在较长的时间间隔。稳态CMB大大低估了农作物和牧场的排水量。

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