关键词: 非损伤离子流检测技术, 作物, 逆境胁迫, 离子流

Abstract: As one of the important wetland ecosystem types, marshes contain rich biological and peat resources. In China, marshes have been transferred into farmland, woodland or pastures after draining since the 1960s, experiencing a dramatic shrink due to the development of agriculture, forestry, and livestock. Drainage became one of the main factors leading to the marsh degradation. This paper compared the changes of ecological characteristics, including the landscape, plant communities and soil characteristics after drainage in Sanjiang Plain and Zoige Plateau， the two largest marshes in China. The marshes in both Sanjiang Plain and Zoige Plateau shrunk after drainage. The plant communities showed a succession sequence from hydrophyte to mesophyte. The decomposition of soil organic matter was accelerated, leading to the decline of soil carbon, nitrogen, and other nutrients. The decline of water table was the main factor driving the change of ecological characteristics. Due to different land uses after drainage, Sanjiang Plain and Zoige Plateau showed different patterns of landscape fragmentation, as well as the change of soil nutrients.

Key words: crop, ion flux, abiotic stress., microelectrode ion flux estimation