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首页> 外文期刊>Archives of Agronomy and Soil Science >Soil nutrient stoichiometries and enzymatic activities along an elevational gradient in the dry-hot valley region of southwestern China
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Soil nutrient stoichiometries and enzymatic activities along an elevational gradient in the dry-hot valley region of southwestern China

机译：中国西南部干热谷地区高地梯度土壤养分化物质与酶活性

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摘要

Changes in vegetation type and climate associated with elevation can strongly affect the soil properties, but their effects on soil nutrient stoichiometry and enzymatic activities have rarely been studied. The contents of soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), available nitrogen (AN), available phosphorus (AP) and available potassium (AK) and activities of six soil enzymes involved in C, N and P cycles were measured along an elevational gradient in the dry-hot valley region of China. C:P, N:P ratios first increased and then decreased with elevation, with the highest values of 89.57 and 4.07, respectively. AN:AP and AN:AK ratios increased linearly with elevation. Absolute enzymatic activities (i.e. per unit of oven-dried soil) tended to increase slightly with elevation, and specific enzymatic activities (i.e. per unit of SOC), except for phosphatase, first significantly decreased and then increased with elevation. A redundancy analysis showed that variations of soil nutrient content and stoichiometry were explained 76.1% by absolute and specific enzymatic activities. The elevational gradient was associated with a shift in nutrient limitation for ecosystem functions and processes, and the specific enzymatic activities responded more clearly than the absolute enzymatic activities to the elevational gradient in this dry-hot valley region.
机译：植被类型和与升高相关的气候变化会强烈影响土壤性质，但它们对土壤养分化学计量和酶活性的影响很少。土壤有机碳（SOC），总氮（TN），总磷（TP），可用氮（AN），可用磷（AP）和可用钾（AK）和六种土壤酶活性的含量，N，N沿着中国干热谷地区的高度梯度测量P循环。 C：P，N：P比率首先增加，然后用升高减少，分别为89.57和4.07的最高值。 AN：AP和A：AK比率随着高度线性增加。绝对酶活性（即，每单位烘箱干燥的土壤）往往以升高略微增加，并且除磷酶除外，特定的酶活性（即，每单位SOC），首先显着降低，然后用升高增加。冗余分析表明，通过绝对和特异性酶活性解释了土壤营养含量和化学计量的变化76.1％。高度梯度与生态系统功能和方法的营养限制的转变相关，并且特定的酶活性比在该干热谷地区的高梯度中的绝对酶活性更清楚地响应。

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