Seed Morphology Characteristics in Relation to Seed Loss by Water Erosion in the Loess Plateau
The role of water erosion on seed loss and on plant establishment and distribution is unknown on the Chinese Loess Plateau. which suffers serious soil erosion. The seed susceptibility of 16 local species to removal by water erosion from loess slopes was determined by rainfall simulation experiments. The experiments were performed on slopes with gradients of 10°, 15°, 20° and 25° for a 60-min duration at an intensity of 50 mm/h. 100 mm/h and 150 mm/h, respectively. The total seed removal rate obviously increased with rainfall intensity but did not obviously change with slope gradient. and the responses were varied among the species. The morphological characteristics affecting seed loss of the various species are quite different. Our experiments showed that the seed removal from some species are mainly due to seed weight, some species are mainly affected by seed shape, some are affected by appendage, some by surface structure, some by the comprehensive effects of the different morphological characteristics, while seeds having mucilage secretion are not easily moved by water erosion. We argued that the seed removal during water erosion can clearly effect seed redistribution and deposition, and consequently, species composition and vegetation spatial distribution.
seed loss seed displacement seed morphology water erosion simulation rainfall experiment
Juying Jiao Luyan Han Yangfeng Jia Dong Lei Ning Wang Linyu Li
Institute of Soil and Water Conservation. Northwest A&F University,Yangling 712100,Shaanxi,China;Ins Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources Institute of Soil and Water Conservation. Northwest A&F University,Yangling 712100,Shaanxi,China
国际会议
西安
英文
380-384
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）