Near-Surface Soil Nutrient Changes over Time under Native Prairie and Managed Agriculture in Arkansas

• 作者: Marya McKee
• 来源期刊: 自然资源(英文)
• 学科: 农学
• 关键词: Long-Term Study Soil Properties Ozark Highlands Grand Prairie
• 年，卷（期）: 2020,（6）
• 页码范围: 243-256
• 页数: 14页
• 分类号: S15

摘要

Landuse change from native prairie to managed agriculture can have substantial impacts on soil nutrient properties. Nutrient release from soil organic matter decomposition is the soil’s inherent source of long-term fertility</span><span style="font-family:Verdana;font-size:12px;">;</span><span style="font-family:Verdana;font-size:12px;"> thus it is imperative to understand the effects of continued landuse over </span><span style="font-family:""><span style="font-size:12px;font-family:Verdana;">time to avoid mistaking actual soil property changes with simple inter-annual </span><span><span style="font-size:12px;font-family:Verdana;">variability from one year to the next. The objective of this study was to evaluate the effects of landuse (</span><i><span style="font-size:12px;font-family:Verdana;">i.e.</span></i><span style="font-size:12px;font-family:Verdana;"> managed agriculture and native prairie) in two contrasting physiographic regions (</span><i><span style="font-size:12px;font-family:Verdana;">i.e.</span></i><span style="font-size:12px;font-family:Verdana;"> the Ozark Highlands region of northwest Arkansas and the Grand Prairie region of east-central Arkansas) on the change in extractable soil nutrients over a 15-yr period from 2001 to 2016. Extractable soil Ca, Mg, and Zn increased at least two times more over time (</span><i><span style="font-size:12px;font-family:Verdana;">P</span></i><span style="font-size:12px;font-family:Verdana;"> < 0.05) under cultivated agriculture in the Grand Prairie than under native prairie in the Grand Prairie or either landuse in the Ozark Highlands. </span></span></span><span style="font-family:Verdana;font-size:12px;">Averaged across landuse</span><span style="font-family:""><span style="font-size:12px;font-family:Verdana;">, extractable soil S increased nine times more over time (</span><i><span style="font-size:12px;font-family:Verdana;">P</span></i><span style="font-size:12px;font-family:Verdana;"> < 0.05) in the Ozark Highlands than in the Grand Prairie, while extract