【摘要】：采用室內(nèi)培養(yǎng)法,設(shè)置不施生石灰和生石灰用量0.3、0.9、1.8、2.4、4.8 g/kg,共6個(gè)用量梯度,研究不同生石灰用量對(duì)酸性土壤pH值動(dòng)態(tài)變化、有效養(yǎng)分含量的影響及土壤pH值與有效養(yǎng)分含量之間的相關(guān)性。結(jié)果表明,生石灰的施入,可以顯著提高土壤pH值,改善土壤酸度。培養(yǎng)到第90 d,生石灰用量4.8、2.4、1.8g/kg處理較對(duì)照分別提高了2.88、1.16和0.74個(gè)pH單位。施用生石灰對(duì)土壤全氮含量影響不大,但對(duì)土壤無(wú)機(jī)氮影響顯著。生石灰用量在0~2.4 g/kg范圍內(nèi),土壤硝態(tài)氮含量隨生石灰用量的增加而顯著增加,增幅為12.4%~146.8%,當(dāng)生石灰用量2.4 g/kg時(shí),土壤硝態(tài)氮含量顯著降低。土壤銨態(tài)氮的變化趨勢(shì)則剛好相反,隨著生石灰用量的增加而減少;土壤有效磷含量隨著生石灰用量的增加先升高后降低;對(duì)于土壤速效鉀來(lái)說(shuō),當(dāng)生石灰用量0.9 g/kg,其含量隨著石灰用量的增加而顯著降低,降幅為2.9%~21.7%。施用生石灰可以顯著提高土壤有效Ca含量,且隨生石灰用量的增加而顯著增加,增幅為32.3%~543.0%。生石灰的施用顯著降低了土壤有效Fe、Mn、Cu、Zn的含量,且當(dāng)生石灰用量≥2.4 g/kg時(shí),土壤有效Mn、Zn含量均已處于極其缺乏的狀況。土壤pH值與土壤全氮、銨態(tài)氮、速效鉀、有效Fe、Mn、Cu、Zn呈顯著線性負(fù)相關(guān),與有效Ca呈極顯著線性正相關(guān),與土壤硝態(tài)氮、有效磷和有效Mg則符合二次函數(shù),各相關(guān)系數(shù)均達(dá)到極顯著水平。土壤養(yǎng)分與土壤酸度有著較好的相關(guān)性,在施用石灰改良酸性土壤時(shí),要特別注意其施用量及土壤有效Mn、Zn等微量元素的及時(shí)補(bǔ)充。
[Abstract]:The effects of different quicklime dosage on the dynamic change of pH value of acid soil, the effect of available nutrient content and the correlation between soil pH value and available nutrient content were studied by using indoor culture method without quicklime and quicklime 0.3, 0.9, 1.8, 2.4, 4.8 g 路kg ~ (- 1). The dynamic change of pH value of acid soil, the effect of available nutrient content and the correlation between soil pH value and available nutrient content were studied. The results showed that the application of quicklime could significantly increase soil pH value and improve soil acidity. On the 90th day, the amount of quicklime was 4.8, 2.4 and 1.8 g / kg higher than that of the control by 2.88, 1.16 and 0.74 pH units, respectively. The application of quicklime had little effect on soil total nitrogen content, but had significant effect on soil inorganic nitrogen. When the amount of quicklime was in the range of 0 鈮，

本文編號(hào)：2515711