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• 第七届中国青年生态学工作者学术研讨会会议专栏 • 上一篇    下一篇

黄土丘陵沟壑区土壤侵蚀环境下芽库的季节动态及垂直分布

杜华栋1,焦菊英1,2**,寇萌3,王宁1   

  1. 1中国科学院水利部水土保持研究所,  陕西杨凌 712100; 2西北农林科技大学水土保持研究所,  陕西杨凌 712100; 3西北农林科技大学林学院,  陕西杨凌 712100)
  • 出版日期:2013-05-18 发布日期:2013-05-18

Seasonal dynamics and vertical distribution pattern of bud bank in different erosion environments on hilly-gully Loess Plateau of Northwest China.

DU Hua-dong1, JIAO Ju-ying1,2, KOU Meng3, WANG Ning1   

  1. (1Institute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resources, Yangling 712100, Shaanxi, China; 2 Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China; 3College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China)
  • Online:2013-05-18 Published:2013-05-18

摘要: 研究了陕北黄土丘陵沟壑区5种土壤侵蚀环境(阳沟坡、阳峁坡、峁顶、阴峁坡、阴沟坡)下的植被组成、芽库组成、芽库季节动态及垂直分布特征.结果表明: 该区拥有永久性芽库的多年生物种占总物种数的80.3%,具季节性芽库的一年生植物占19.7%.在侵蚀严重的阳沟坡和阳峁坡,植物返青期的永久性芽库存量较大,而在侵蚀强度较小的峁顶、阴沟坡和阴峁坡,植物开花结实期的季节性芽库密度较大.不同侵蚀环境下地下部分芽库库存量占总永久性芽库的比例较稳定,地面永久性芽库存量在阳坡较大,而地上部分季节性芽库存量在阴坡和峁顶较大.由于不同侵蚀环境下植物群落的物种组成不同,加上土壤侵蚀干扰和植物季节更新,影响了芽库在季节及垂直分布上的变化.在黄土丘陵沟壑区植被更新过程中, 芽库具有重要作用.

Abstract: This paper studied the vegetation composition, bud composition, and the seasonal dynamics and vertical distribution pattern of bud bank in five erosion environments (sunny gully slope, sunny hilly slope, hilltop, shady hilly slope, and shady gully slope) on the hilly-gully Loess Plateau of North Shaanxi. In the study area, the perennial species with perennial bud bank accounted for 80.3% of the total species, while the annual species with seasonal bud bank took up 19.7% of the total. In vegetation turning-green season, there was a relatively large perennial bud bank stock on the sunny hilly-gully slope where serious erosion occurred, while seasonal bud bank showed a higher bud bank density in blossom and fruit-setting season on the hilltop and two shady slopes where soil erosion intensity was relatively gentle. The proportion of underground bud bank to total perennial bud bank in different erosion environments was relatively stable. On the land surface, the perennial bud bank stock was larger on the sunny slope where the soil disturbance often occurred, whereas the seasonal bud bank stock was larger on the shady slope and hilltop. Due to the different species composition of plant communities in different erosion environments, in addition to the disturbance of soil erosion and the seasonal plant regeneration, the seasonal dynamics and vertical distribution pattern of bud bank changed. It was suggested that bud bank played an important role in the vegetation regeneration after the disturbance of soil erosion on the hilly-gully Loess Plateau of North Shaanxi.