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《Journal of Soil Water Conservation》 2002-01
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Crop Characteristics and Their Temporal Change on Loess Plateau of China

WU Yong qiu 1, ZHANG Qing chun 2, ZHANG Yan 1, LIU Bao yuan 1, ZHAO Deng feng 1 (1.Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, College of Resources and Environmental Science, Beijing Normal Univ  
Plant canopy, one of most important factor influencing soil and water conservation, has been studied for a long time. Crop characteristics, with great seasonal changes through the year, influence the soil loss significantly. The purpose of this study is to measure and analyse the plant characteristics and their seasonal change in the Loess Plateau. A small watershed, Danangou in the Loess Plateau of north China, was selected for this study. Crop characteristics including plant cover, plant height and leaf area index (LAI) had been measured every two weeks in 1998,1999 and 2000. In Danangou watershed, half of the lands are used as cropland for maize, foxtail millet, pearl millet, potato, buckwheat and soybean, and the others are wasteland, fallow, shrub, woodland and orchard.For cropland, LAI, height and cover changed greatly during the measurement season. The cover of cropland increased lately and slowly during the spring, and reached their highest values in August. For non cropland,cover increased from April, arrived the high value in May or June, and kept it to September even October. Annual precipitation has big influences for the crop characteristics. The individual rainfall event also has an important effect on plant characteristics. Because cropland consists of half of the watershed, landuse condition of the Danangou is not very good for soil and water conservation.
【Fund】: 国家重点基础研究发展规划项目“草地与农牧交错带生态系统重建机理及优化生态—生产范式”(课题编号 : G2 0 0 0 0 1860 5 );; 国家自然科学杰出青年基金 (批准号 :4972 5 10 3 );; 国家自然科学基金 (批准号 :40 0 710 80 )资助项目
【CateGory Index】: S157.1
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