Soil Quality Differences Under Native Tallgrass Prairie Across a Climosequence in Arkansas
Soil Quality Differences Under Native Tallgrass Prairie Across a Climosequence in Arkansas
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阿肯色州气候层序原生高草草原下的土壤质量差异
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
E. Gbur
中科院分区：
文献类型：
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作者：
K. Brye;Charles P. West;E. Gbur
气候，特别是湿度和温度，影响植物生长和养分循环；因此，气候也影响草原的发展。在大平原和更湿润的森林之间的生态过渡区进行的研究相对较少。由于湿度和温度影响许多生态系统过程，南方森林地区湿润的气候对土壤生物地球化学循环的影响与草地土壤不同。本研究的目的是评估阿肯色州湿温带（欧扎克高地）高草草原和湿亚热带（大草原）气候制度之间过渡地带的土壤质量和选定土壤性质之间的关系。不同地理区域间10 cm以上土壤的物理、化学和生物特性存在显著差异。土壤总氮(N)和总碳(C)、可提取磷和可提取锰、电导率和土壤有机质浓度之间的线性关系在不同地理区域之间存在显著差异。土壤总氮和总碳随土壤容重的增加而减少。总碳与容重的关系因地理区域而异，而总氮与容重的关系则无显著差异。相对温暖湿润气候下的天然高草草原土壤有机质浓度、C:N比和许多可提取养分均较高，且所选土壤性质之间的关系与相对凉爽干燥气候下不同。这项研究的结果表明，草原的保护、恢复和管理实践应根据气候制度而有所不同。
Abstract Climate, specifically moisture and temperature, influences plant growth and nutrient cycling; thus, climate also influences prairie development. Relatively little research has been conducted in the ecological transition zone between the Great Plains and the more humid forests. Since moisture and temperature affect many ecosystem processes, the wetter climate of the southern forest region should influence soil biogeochemical cycling quite differently from that in grassland soils. The objective of this study was to evaluate soil quality and the relationships between selected soil properties across a climosequence in a transition zone between tallgrass prairie in humid-temperate (Ozark Highlands) and humid-subtropical (Grand Prairie) climate regimes in Arkansas. Soil physical, chemical and biological properties of the upper 10 cm differed significantly between physiographic regions. Linear relationships between total soil nitrogen (N) and carbon (C), extractable phosphorus and manganese, electrical conductivity and soil organic matter concentration differed significantly between physiographic regions. Total soil N and C decreased with increasing soil bulk density in both physiographic regions. The relationship between total C and bulk density differed by physiographic region, while the relationship between total N and bulk density did not. Soil organic matter concentration, C:N ratio, and many extractable nutrients, were higher and relationships between selected soil properties differed under native tallgrass prairie in a relatively warm and wet climate than that in a relatively cooler and drier climate. The results of this study suggest that prairie preservation, restoration and management practices should differ depending on climate regimes.