草业学报2011，Vol.20Issue(1)：1-6,6.
青藏高原"黑土滩"退化草地植物和土壤对秃斑面积变化的响应
The response of plants and soil on black soil patch of the Qinghai—Tibetan Plateau to variation of bare-patch areas
摘要
Abstract
Characteristics and variation of soil and vegetation in and surrounding, 93 bare patches of a typical “black soil patch” area of the Qinghai—Tibetan Plateau were investigated. Bare-patches formed “negative fertile islands” after sod layers breaking off in alpine meadows, i.e. soil nutrients in bare-patches were lower than those in the surroundings. There were obvious differences in total nitrogen, ammonium nitrogen, and organic carbon between the two parts. The pH values of bare patches were higher than those of the surroundings, so meadows lose nutrients in bare patches. If the bare-patch was more than 5 m2 , the heterogeneity was reduced compared with the surroundings. The maximum number of plant species in bare-patches was 20 to 25, considerably lower than that of the grassland covered with a sod layer. The major toxic weeds, Aconitum pendulum and Carum carvi, in the bare-patches had a linear positive correlation with the bare-patch area, and the number of rat holes was also linearly positively related to the bare-patch area.关键词
青藏高原/黑土滩/秃斑块/植物群落/土壤养分Key words
Qinghai— Tibetan Plateau/ black soil patch/ bare-patch/ plant community/ soil nutrients分类
农业科技引用本文复制引用
韩立辉,尚占环,任国华,王彦龙,马玉寿,李希来,龙瑞军..青藏高原"黑土滩"退化草地植物和土壤对秃斑面积变化的响应[J].草业学报,2011,20(1):1-6,6.基金项目
国家自然科学基金(30600426,30730069,30760160)资助. （30600426,30730069,30760160）
