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首页> 外文期刊>International journal of soil science >Soil Enzymes Activities in Irrigated and Rain-Fed Vertisols of the Semi-Arid Tropics of Sudan
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Soil Enzymes Activities in Irrigated and Rain-Fed Vertisols of the Semi-Arid Tropics of Sudan

机译：苏丹半干旱热带地区灌溉和雨养Vertisols土壤酶活性

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摘要

Soil management practices that involve intensive traditional ploughing and disking may affect soil quality. Soil enzymes activities were investigated from crop rotations in irrigated and rain-fed areas. Soil samples collected from long term (79 years), medium-term (46 years) and short-term (22 years) irrigated cotton (Gossypium hirsutum) schemes and rainfed cultivation of sorghum {Sorghum bicolor) and sesame (Sesamum indicum) in a semi-arid tropical Vertisol. Alkaline phosphatase was significantly higher in both short-term (661 mu g p-nitrophenol g~(-1) soil h~(-1)) and rain-fed cultivation (605-747 mu g p-nitrophenol g~(-1) soil h~(-1)). Long- and medium-term cultivation in the irrigated sector had significantly less protease activity [3.75-4.73 mug tyrosine g~(-1) soil (2 h~(-1))] compared to other cultivation systems [11.54-15.09 fig tyrosine g~(-1) soil (2 h~(-1))]. Except, long-term cultivation, there was a general separation in the activity of |3-glucosidase between irrigated [average of 21.9 mu g saligenin g~(-1) soil (3 h)~(-1)] and rainfed Vertisols [17.9 mu g saligenin g~(-1) soil (3 h)~(-1)]. Correlation analysis and Principal Component Analysis (PCA) revealed that only alkaline phosphatase activity was positively correlated with totalsoil N and carbon contents. These results may draw attention on the impact of intensive application of agro-chemicals (pesticides, herbicides and fertilizers) on soil health in the world biggest Gezira cotton scheme.
机译：涉及大量传统耕作和耕作的土壤管理实践可能会影响土壤质量。通过灌溉和雨育地区的作物轮作研究土壤酶活性。从长期（79年），中期（46年）和短期（22年）的灌溉棉花（Gossypium hirsutum）计划以及高粱（Sorghum bicolor）和芝麻（Sesamum indicum）的雨养栽培中收集的土壤样品半干旱热带眩晕。短期（661μg对硝基苯酚g〜（-1）土壤h〜（-1））和雨育栽培（605-747μg对硝基苯酚g〜（-1）两者中的碱性磷酸酶均显着较高）土壤h〜（-1））。与其他耕种系统相比，灌溉部门的中长期耕作的蛋白酶活性[3.75-4.73杯酪氨酸g〜（-1）土壤（2 h〜（-1））]明显较少[11.54-15.09图酪氨酸g〜（-1）土壤（2 h〜（-1））]。除了长期耕作外，| 3-葡萄糖苷酶的活性在灌溉的土壤中（平均21.9μg盐渍素g〜（-1）土壤（3 h）〜（-1））与雨养的Vertisols [一般]分离。 17.9μgsaligenin g〜（-1）土壤（3 h）〜（-1）]。相关分析和主成分分析（PCA）表明，仅碱性磷酸酶活性与土壤总氮和碳含量呈正相关。这些结果可能会引起人们的注意，即在世界上最大的Gezira棉花计划中，大量施用农药（农药，除草剂和化肥）对土壤健康的影响。

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