Changes in Ecosystem Carbon Following Afforestation of Native Sand Prairie
Changes in Ecosystem Carbon Following Afforestation of Native Sand Prairie
复制标题
原生沙草原造林后生态系统碳的变化
DOI：
10.2136/sssaj2012.0327
复制
发表时间：
2013
影响因子：
2.9
通讯作者：
E. Paul
中科院分区：
文献类型：
--
作者：
N. Mellor;J. Hellerich;R. Drijber;S. Morris;M. Stromberger;E. Paul
确定碳(C)作为植被和残留物输入的函数的动态对于预测生态系统功能和全球碳循环的变化很重要。为了评价不同类型土地管理对土壤碳含量和周转率的影响，对内布拉斯加州国家森林的东部红柏(Juniperous Virginiana)、黄松(Pinus Ponderosa)人工林和原生草原的凋落物和土壤样品进行了分析。1m深度以下土壤全碳含量以雪松林最大。松树生态系统在乔木生物量和凋落物中储存了更多的C，但从土壤中流失了更多的草原原生C。土壤碳含量为原始的82%，雪松林下的草原碳含量保持在原来的82%，而松树林下的土壤碳含量保持在∼的45%。土壤阳离子含量总体上以雪松最高，松树最低。雪松土壤中碳含量与钙含量呈极显著正相关。微生物群落脂肪酸谱的差异与植被类型有关，营养物质解释了∼剖面变化的60%。我们的研究表明，退耕还林后土壤碳和养分含量的变化取决于种植的树种、植物凋落物的特性和植物-土壤系统中的阳离子循环。
Determining the dynamics of carbon (C) as a function of vegetation and residue inputs is important for predicting changes in ecosystem functions and the global C cycle. Litter and soil samples were analyzed from plantations of eastern red cedar (Juniperous virginiana) and ponderosa pine (Pinus ponderosa) and native prairie at the Nebraska National Forest to evaluate the impact of different types of land management on soil C contents and turnover rates. Total soil C to a depth of 1 m was greatest in the cedar stands. Pine ecosystems stored more C in the tree biomass and litter but lost more native prairie C from the soil. The soil ¹³C content showed 82% of the original, and prairie C remained under cedars compared with ∼45% under pine. Soil cation contents were greatest overall in cedar soils and lowest in pine. The C content in cedar soils was strongly related to Ca content. Differences in microbial community fatty acid profiles were related to vegetation type, and nutrients explained ∼60% of the variation in profiles. Our research indicates that changes in soil C and nutrient content following conversion from prairie to forest are dependent on tree species planted, characteristics of the plant litter, and cation cycling in the plant–soil system.