文献类型： 外文期刊
作者： Yu-Zhu, Sui 1 ; Han-Min, Yuan 2 ;
作者机构： 1.Lanzhou Univ, Coll Resource & Environm Sci, Lanzhou 730000, Peoples R China
2.Lanzhou Univ, Coll Resource & Environm Sci, Lanzhou 730000, Peoples R China; Qingdao Univ, Dept Environm Sci & Engn, Qingdao 266010, Shandong, Peoples R China; Ningxia Acad Agr & Forestry Sci, Ningxia 750001, Peoples R China
关键词： agro-ecosystems;East Asia;environmental technology;sandstorm;sustainable development;wheat
期刊名称：ECOLOGICAL ECONOMICS （ 影响因子：5.389； 五年影响因子：6.233 ）
ISSN：
年卷期：
页码：
收录情况： SCI
摘要： With the warming and drying of climate and desertification, sandstorms are occurring on a more frequent basis. In China, high-frequency regions of sandstorms tend to correspond with the spring wheat regions between the end of February and the end of March. During March to May each year, when sandstorms frequently occur, the seedlings of spring wheat are young and susceptible to being uprooted by the winds. There is not enough plant coverage or root depth at this early stage to hold the soil from the fierce winds. As a result, the young plant life is destroyed and leaving the top soil susceptible to being blown about when in the path of high-frequency regions of sandstorms. By contrast, the seeding time of winter wheat is about September-October corresponding to lowest-frequency period of sandstorms. From the end of February to the middle of March, the winter wheat begins to turn green (ahead of 10 day than grass). During March to May when sandstorm frequently occurs, the winter wheat has come into a mature tillering or jointing stage. By then, the leaf area index is 1-4 and height is up to 20-50 cm, by which the loose soil is more compacted and covered with the fledging wheat. The result is that the energy of the air current is gradually dissipated and the wind speed near the ground is greatly weakened. So, without bare uncovered soil being whipped by powerful winds, the resulting sandstorms are greatly mitigated or weakened. After investigating the trend of global warming, the geological history-forming mechanism of sandstorms and their temporal-spatial distributions, and test for the last few years, the result is that by replacing spring wheat with winter wheat in high-frequency sandstorm regions, the damages of sandstorm are greatly reduced. Thus, by significantly increasing the vegetal cover time of ground during the windy season, one can alleviate the hazard index of sandstorms, which is a social, ecological and economic favorable result.
- 相关文献
