草业学报2016，Vol.25Issue(11)：25-33,9.DOI:10.11686/cyxb2015215
放牧管理模式对高寒草甸生态系统有机碳、氮储量特征的影响
Changes in organic carbon and nitrogen storage in alpine meadows under different grazing management regimes
摘要
Abstract
A study has been undertaken to investigate changes in organic carbon and nitrogen storage under dif-ferent grazing regimes in the alpine meadow ecosystem of the eastern margin of the Qinghai-Tibetan plateau. Organic carbon and nitrogen storage was measured in above-ground biomass,litter,roots and the 0-80 cm soil layer (divided 8 layers,and each layer was 10 cm)at four sites that represent different grazing management re-gions:non-grazing (NG),grazing rest during the growing stage (RG),traditional grazing (TG)and continu-ous grazing (CG).The results indicated that organic carbon and nitrogen in the 0-80 cm soil layer,roots,a-bove-ground tissue and litter were significantly higher in NG,RG and TG than in CG.In general,the propor-tion of organic carbon in the alpine meadow ecosystem was the largest in soils (88.859%-98.242%),followed by roots (1.563%-8.742%),vegetation (0.172%-1.430%)and litter (0.022%-0.969%);similarly,the proportion of nitrogen was the largest in soils (97.331%-99.633%),followed by roots (0.316%-2.071%), vegetation (0.047%-0.442%)and litter (0.003%-0.157%).There were obvious differences in the vertical distributions of soil organic carbon and nitrogen storage under the four grazing regimes,with these differences mainly affecting the 0-40 cm layer and with no significant effect on deeper layers.Organic carbon and nitrogen storage was mainly distributed in the 0-40 cm layer,with grazing tending to move this storage to deeper lay-ers.NG,RG and TG significantly increased storage in the alpine meadow ecosystem,while CG significantly reduced storage and was associated with a loss of carbon and nitrogen.Non-grazing and seasonal rest grazing can thus contribute to achieving carbon and nitrogen sinks on the eastern margin of the Qinghai-Tibetan Plat-eau and are important grazing management regimes for this and similar areas.关键词
高寒草甸/放牧管理/有机碳储量/氮储量Key words
alpine meadow/grazing management/organic carbon storage/nitrogen storage引用本文复制引用
李文,曹文侠,师尚礼,李小龙,陈建刚,徐长林..放牧管理模式对高寒草甸生态系统有机碳、氮储量特征的影响[J].草业学报,2016,25(11):25-33,9.基金项目
国家自然科学基金（31360569），现代农业产业技术体系（CARS-35），甘肃省退牧还草科技支撑项目和青藏高原打草场建设项目资助。 （）
