若尔盖湿地高寒草甸退化过程中土壤有机碳含量变化及成因分析

董利军, 李金花, 陈珊, 张瑞, 孙建, 马妙君

Changes in soil organic carbon content and their causes during the degradation of alpine meadows in Zoigê Wetland

DONG Li-Jun, LI Jin-Hua, CHEN Shan, ZHANG Rui, SUN Jian, MA Miao-Jun

表1 若尔盖湿地高寒草甸退化阶段划分依据

Table 1 Classification basis of degradation stages of alpine meadows in Zoigê Wetland

草地类型 Grassland type 优势种 Dominant species 主要伴生种 Major associated species 塔头情况 Condition of grass hill 鼠兔洞穴 Pika cave 总盖度 Total coverage (%) 高寒草甸 Alpine meadow (AM) 木里薹草 Carex muliensis 鹅绒委陵菜、矮生嵩草 Potentilla anserine, Kobresia humilis 塔头高10-20 cm The height of grass hill was 10-20 cm 无 No 92 轻度退化高寒草甸 Slightly degraded alpine meadow (SD) 木里薹草 C. muliensis 鹅绒委陵菜、华扁穗草 P. anserine, Blysmus sinocompressus 无塔头 No grass hill 有 Yes 97 重度退化高寒草甸 Heavily degraded alpine meadow (HD) 二裂委陵菜 P. bifurca 鹅绒委陵菜、木里薹草 P. anserine, C. muliensis 无塔头, 出现斑块化裸地, 部分土地沙化 No grass hill, there were patches of bare land, and partially desertifield land 有 Yes 64