应用生态学报2012，Vol.23Issue(12)：3325-3330,6.
短期围栏封育对荒漠草原沙化灰钙土有机碳组分及物理稳定性的影响
Effects of short-term fencing on organic carbon fractions and physical stability of sandy sierozem in desert steppe of Northwest China
摘要
Abstract
In order to explore the change patterns of organic carbon fractions and physical stability of sandy sierozem in desert steppe at the early stage of fencing, 0-40 cm soil samples were collected from a 5-year fenced desert steppe (inside the fence) and a free grazing steppe (outside the fence) in Yanchi County of Ningxia, Northwest China, with the soil organic carbon, labile organic carbon, and paniculate organic carbon contents and soil particle composition analyzed. No significant differences were observed in the soil organic carbon content and soil particle composition inside and outside the fence. The average soil organic carbon inside and outside the fences was 3. 25 g·kg-1, the percentages of sand, silt, and clay were averagely 72% , 16% , and 12% , respectively, and the soil physical stability index was 1. 30% -1. 31%. The soil active organic carbon showed a significant change in 10-20 cm layer. The soil labile organic carbon content was 0. 80 g·kg-1 inside the fence, which was significantly higher than that outside the fence (0.62 g·kg-1). The percentage of soil particulate organic carbon was 50. 9% inside the fence, which was also significantly higher than that outside the fence (31. 7% ). The soil texture inside the fence changed from sandy to loam, and the soil labile organic carbon content increased gradually; while the soil texture outside the fence was sandy, and its vertical change was relatively smooth. The organic carbon of sandy si-erozem in the desert steppe under the conditions of short-term fencing was still in a balance between consumption and accumulation, the soil texture was relatively stable, and the soil physical stability changed little. It was suggested that the soil active organic carbon content and its relative percentage in 10-20 cm layer could be used as the indicators of early soil quality change of desert steppe.关键词
荒漠草原/围栏封育/土壤有机碳/沙化灰钙土Key words
desert grassland/ fencing/ soil organic carbon/ sandy sierozem分类
农业科技引用本文复制引用
杨新国,宋乃平,李学斌,刘秉儒..短期围栏封育对荒漠草原沙化灰钙土有机碳组分及物理稳定性的影响[J].应用生态学报,2012,23(12):3325-3330,6.基金项目
国家"973"计划前期研究专项(2012CB723206)、国家自然科学基金项目(41101301,31140017)和宁夏回族自治区自然科学基金项目(NZ1005)资助. （2012CB723206）
