北京师范大学学报（自然科学版）2017，Vol.53Issue(5)：615-623,9.DOI:10.16360/j.cnki.jbnuns.2017.05.018
禁牧放牧下温湿度对西藏那曲地区高寒草甸土壤碳矿化的影响
Effect of temperature and humidity on the alpine meadow soil carbon mineralization under different management in Naqu prefecture in Tibet
摘要
Abstract
Soil carbon mineralization rate is affected by many factors.A laboratory incubation experiment was conducted in the present work with strictly controlled temperature and water levels to determine the effect of temperature and moisture on soil carbon mineralization rate of grazing prohibited and freely-grazing alpine meadows in Naqu,Tibet.Combined with determined soil-related indicators revealed mechanism of temperature and humidity on soil carbon mineralization.The incubation experiment consisted of five temperature treatments (5,10,15,20,and 25 ℃) and two water treatments (40％ and 60％ of water holding capacity,WHC).The soil carbon mineralization rate was found to be mainly affected by temperature and humidity.At low temperatures and 60％ soil water holding capacity,there was no significant difference in soil carbon mineralization rate for grazing prohibited and freely-grazing meadows,and the soil carbon mineralization rate increased significantly with the increase in temperature (P＜0.05).At the same temperature and 40％ soil water holding capacity,the soil carbon mineralization rate of freely-grazing meadow was significantly higher than grazing prohibited meadows (P＜ 0.05).The average carbon mineralization rate in soil under freelygrazing meadow at 40％ soil water holding capacity was (0.66 ± 0.30) μmol·g-1 ·s-1,73.7％ higher than at 60％ soil water holding capacity.The average carbon mineralization rate of soil in grazing prohibited area at 60％ soil water holding capacity was (0.27 ± 0.01) μmol·g1·s-1,3.8％ higher than at 40％ soil water holdingcapacity.Other than the direct effects of temperature and humidity,the density and activity of soil microbial community,soil physical and chemical indicators also affected soil carbon mineralization rate.With the increase in temperature,the microbial biomass carbon was not changed at the early stage of incubation and the later stage,but the microbial biomass carbon increased significantly (P＜0.05) at the medium stage.The change of soil dissolvable organic carbon was not consistent under different management methods.关键词
土壤温度/土壤湿度/高寒草甸/土壤碳矿化Key words
soil temperature/soil moisture/alpine meadow/soil carbon mineralization分类
农业科技引用本文复制引用
武山梅,刘颖慧,李悦,聂成,杜薇..禁牧放牧下温湿度对西藏那曲地区高寒草甸土壤碳矿化的影响[J].北京师范大学学报（自然科学版）,2017,53(5):615-623,9.基金项目
国家重点研发计划资助项目(2017YFC0503805) （2017YFC0503805）
国家自然科学基金资助项目(31770519) （31770519）
