發(fā)布時間：2019-06-29 20:22

【摘要】：以內(nèi)蒙古溫帶草原為對象,研究了不同比例和水平的氮磷輸入對土壤pH和化學(xué)計(jì)量學(xué)特征的影響。結(jié)果表明,與不添加氮磷的對照相比,添加氮磷的土壤pH在氮輸入大于30g·m~(-2)的情況下顯著降低(P0.05),而在不施加磷肥只施加氮肥的情況下,10g·m~(-2)氮輸入也顯著降低了土壤pH(P0.05),而且顯著低于添加磷肥的處理(P0.05)。另外,與高比例和水平的氮磷輸入相比,低比例和水平的氮磷輸入顯著降低土壤大量元素(鉀、鈣和鎂)、微量元素(鐵、錳、銅和鋅)和毒性元素(鋁和錳)(P0.05),而且還降低土壤N∶P。可能是由于該地區(qū)土壤磷含量低,低氮高磷輸入緩解植物生長受磷限制,促進(jìn)植物生長的同時,降低土壤養(yǎng)分。由此可見,根據(jù)當(dāng)?shù)赝寥鲤B(yǎng)分和氮輸入的量,適量添加磷可以緩解外源氮輸入對土壤pH和化學(xué)計(jì)量學(xué)特征的影響。
[Abstract]:The effects of nitrogen and phosphorus inputs on soil pH and chemometrics characteristics in temperate grasslands of Inner Mongolia were studied. The results showed that compared with the control without nitrogen and phosphorus, the pH of soil added with nitrogen and phosphorus decreased significantly when the nitrogen input was more than 30g 路m ~ (- 2) (P 0.05), and the input of 10 g 路m ~ (- 2) nitrogen also decreased the soil pH significantly when the nitrogen fertilizer was not applied (P 0.05), and was significantly lower than that of the treatment with phosphate fertilizer (P 0.05). In addition, compared with high proportion and level of nitrogen and phosphorus input, low proportion and level of nitrogen and phosphorus input significantly decreased a large number of elements (potassium, calcium and magnesium), trace elements (iron, manganese, copper and zinc) and toxic elements (aluminum and manganese) (P 0.05), and also decreased soil N 鈮，

本文編號：2508085