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Response of Gross Mineralization and Nitrification Rates to Banana Cultivation Sites Converted from Natural Forest in Subtropical China
Land ( IF 3.905 ) Pub Date : 2021-04-04 , DOI: 10.3390/land10040376
Xinghua Qin , Cheng Yang , Lin Yang , Erdeng Ma , Lei Meng , Tongbin Zhu

Evaluations of gross mineralization (MNorg) and nitrification (ONH4) can be used to evaluate the supply capacity of inorganic N, which is crucial in determining appropriate N fertilizer application. However, the relevant research for banana plantations to date is limited. In this study, natural forest and banana plantations with different cultivation ages (3, 7, 10, and 22 y) were chosen in a subtropical region, and the 15N dilution technique was used to determine the gross MNorg and ONH4 rates. The objective was to evaluate the effect of the conversion of natural forests to banana plantations on inorganic N supply capacity (MNorg + ONH4) and other relevant factors. Compared to other natural forests in tropical and subtropical regions reported on by previous studies, the natural forest in this study was characterized by a relatively low MNorg rate and a high ONH4 rate in the soil, resulting in the presence of inorganic N dominated by nitrate. Compared to the natural forest, 3 y banana cultivation increased the MNorg and ONH4 rates and inorganic N availability in the soil, but these rates were significantly reduced with prolonged banana cultivation. Furthermore, the mean residence times of ammonium and nitrate were shorter in the 3 y than in the 7, 10, and 22 y banana plantations, indicating a reduced turnover of ammonium and nitrate in soil subjected to long-term banana cultivation. In addition, the conversion of natural forest to banana plantation reduced the soil organic carbon (SOC), total N and calcium concentrations, as well as water holding capacity (WHC), cation exchangeable capacity (CEC), and pH, more obviously in soils subjected to long-term banana cultivation. The MNorg and ONH4 rates were significantly and positively related to the SOC and TN concentrations, as well as the WHC and CEC, suggesting that the decline in soil quality after long-term banana cultivation could significantly inhibit MNorg and ONH4 rates, thus reducing inorganic N supply and turnover. Increasing the amount of soil organic matter may be an effective measure for stimulating N cycling for long-term banana cultivation.

中文翻译:

亚热带天然林转换成香蕉的总矿化率和硝化率对种植地的响应

总矿化度(M Norg)和硝化作用(O NH4)的评估可用于评估无机氮的供应能力,这对于确定适当的氮肥施用至关重要。但是,迄今为止对香蕉种植园的相关研究是有限的。在这项研究中,在亚热带地区选择了不同种植年龄(3、7、10和22年)的天然林和香蕉种植园,并使用15 N稀释技术确定总M Norg和O NH4的比率。目的是评估天然林向香蕉种植园的转化对无机氮供应能力的影响(M Norg + O NH4)和其他相关因素。与先前研究报告的热带和亚热带地区的其他天然林相比,本研究中的天然林的特征在于土壤中的M Norg率相对较低,而O NH4率较高,导致存在以氮为主的无机氮。硝酸盐。与天然林相比,3年香蕉种植增加了M Norg和O NH4土壤中无机氮的利用率和无机氮的利用率,但是随着香蕉种植时间的延长,这些比例会大大降低。此外,铵态氮和硝酸盐的平均滞留时间在3年中比在7、10和22年的香蕉人工林中要短,这表明长期种植香蕉的土壤中铵态氮和硝酸盐的周转减少。此外,天然林向香蕉种植园的转化减少了土壤中的有机碳(SOC),总氮和钙浓度以及持水量(WHC),阳离子交换量(CEC)和pH,这在土壤中更为明显。长期种植香蕉。M Norg和O NH4香蕉和土壤中的有机碳和有机碳含量与有机碳和总氮浓度以及WHC和CEC呈显着正相关,这表明长期香蕉栽培后土壤质量的下降可能显着抑制M Norg和O NH4的含量,从而减少了无机氮的供应和周转。增加土壤有机质的量可能是刺激长期香蕉栽培中氮循环的有效措施。
更新日期:2021-04-04
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