The Degraded Ecosystem Restoration in the Arid and Semi-arid Northern China-Mongolia Region
This paper summarized some new techniques used in combating desertification and resto-ring the degraded ecosystems in arid Northwest China. An unusual technique that uses Lignin Sand Stabilizing Material ( LSSM) to stabilize the fugitive dunes and re-green it with arena-ceous plants was described in details because it is different from the common techniques. LSSM, is a reconstructed organic compound with lignin as the most dominant component from the extracts of black-liquor issued by straw pulp paper mills. Unlike the polyvinyl acetate or foamed asphalt commonly used for dune stabilization, the new material is plant-friendly and can be used with virescence actions simultaneously. The field experimental study was conducted since 2001 in Chinas Northwest Ningxia Hui Autonomous Region and has been proved effective in stabilizing the fugitive dunes,making the arenaceous plants survive and the bare dune vegeta-tive. A comprehensive field investigation was conducted to evaluate the effect of sand fixation. The main results are: ①with the help of LSSM, the newly formed plant community is stable and sustainable shown by its species configuration, adaptation capability to extreme drought climate, and the capability of self-development and regeneration. ②The measurement of soil water content within the community shows that fugitive dune can keep soil water effectively be-cause there is no capillary and the selected drought-tolerant arenaceous plants,Agriophyllum squarrosum ( L. ) Moq. ,Artemisia desertorum Spreng., Tamarix chinensis Lour, can survive un-der extreme drought conditions,which are proved effective in desertification controlling as be-ing used with LSSM. ③As the community being constructed, soil nutrients of the stabilized and greened dune, such as organic matter and total nitrogen are increased significantly as compared with the control,which is helpful to the growth of arenaceous plants. The total phosphorous and kalium show less variation than does organic matter and total nitrogen,the soil nutrients varied differently in layers of different depths. The technique is worthwhile to be popularized because it is provide not only a new method for desertification control but also an outlet for cleaning contaminations issued from the straw paper mills.
Degraded ecosystem restoration Fugitive dune fixation Iignin Sand Stabilization Material (LSSM)
Wang Hanjie Jing Ii Liu Maosong Yang Wan ren
Key Laboratory of Regional Climate-environment Research for Temperate East Asia (RCE-TEA) ,Institute School of life Science,Nanjing University,Nanjing,China,210093 Ningxia Agricultural Comprehensive Development Office,Yinchuan,China,753400
国际会议
银川
英文
3-15
2006-06-20（万方平台首次上网日期，不代表论文的发表时间）