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Fine root biomass and soil properties following the conversion of miombo woodlands to shifting cultivation lands
Catena ( IF 6.2 ) Pub Date : 2020-06-05 , DOI: 10.1016/j.catena.2020.104693
Tarquinio Mateus Magalhães , Faruk Pires Semedo Mamugy

Fine root (Fr) biomass, soil organic matter (SOM), and soil organic carbon (SOC) and soil total nitrogen (STN) stocks are affected by land use. Conversion of woodland to agricultural land is reported to result in depletion of SOC and STN stocks. However, information on Fr biomass, and SOC and STN stocks changes following conversion of miombo woodlands to shifting cultivation lands is lacking and might be highly variable depending on the shifting cultivation system practiced. Swidden agriculture is the most complex and multifaceted form of agriculture in the world and it is a highly diverse land use system. It was expected that conversion of miombo woodlands to shifting cultivation lands would result in decreased Fr biomass, soil organic matter (SOM), and SOC and STN stocks as a result of the removal of the trees, soil burning, and other vegetation disturbances typical of this agricultural system. The results showed that the conversion of miombo woodlands to swidden agriculture lands did not impact SOM, SOC and STN stocks; however, it led to a loss of 52% of Fr biomass. In miombo woodlands, Fr biomass and the soil properties (SOM, SOC, STN) were significantly dependent on basal area (m2 ha−1). In swidden agriculture lands, they were dependent on stump cross-sectional area (m2 ha−1). Shifting cultivation lands have the potential to store as much organic matter, C and N in the soil as miombo woodlands, depending on the form of shifting cultivation practiced. Further researches are required on different forms of shifting cultivation practices and its impacts on soil properties.



中文翻译:

苗博姆林地转变为耕地后,细根生物量和土壤特性

土地利用会影响细根(Fr)生物量,土壤有机质(SOM),土壤有机碳(SOC)和土壤总氮(STN)储量。据报告林地转为农业用地导致SOC和STN库存减少。但是,缺乏有关Fr生物量以及SOC和STN储量的信息,这些数据是在将Miombo林地转换为轮作耕地后发生变化的,取决于实践的轮作耕作制度,该信息可能会高度可变。轮作农业是世界上最复杂和多方面的农业形式,它是高度多样化的土地利用系统。预计因树木砍伐,土壤焚烧,森林砍伐,以及该农业系统典型的其他植被干扰。结果表明,将Miombo林地转变为湿耕农地并没有影响SOM,SOC和STN存量。然而,这导致Fr生物量损失52%。在Miombo林地,Fr的生物量和土壤特性(SOM,SOC,STN)显着依赖于基础面积(m2  ha -1)。在湿润的农业土地上,它们取决于树桩截面积(m 2  ha -1)。轮作耕地有可能在土壤中储存与密欧博林地一样多的有机物,碳和氮,具体取决于轮作耕种的形式。还需要对不同形式的轮作栽培实践及其对土壤特性的影响进行进一步研究。

更新日期:2020-06-05
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