STUDY ON VEGETATIVE COVERAGE AND HEIGHT VARIATION IN NORTHERN LOESS PLATEAU
1.Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education of China, Beijing Normal University, Beijing 100875, China；2.Land Arrangement Center, Ministry of Land Resources of China,Beijing 100035, China
Received date: 2001-12-07
Revised date: 2001-12-28
Online published: 2002-04-01
Vegetative growing patterns are important factors in soil erosion modeling. Vegetation growth is limited mainly by precipitation. Field measurements of three years were analyzed to study on the influence of interannual and seasonal change of precipitation on the coverage and height of six types of vegetation. The following results are derived: ①Silver chain, shrub, waste-land vegetation and crop of the six types under research are influenced remarkably by annual precipitation with the peak coverage in draught year is only half of that in medium precipitation year. As for vegetation height, fallow-land vegetation and crop are most influenced by annual precipitation. ②The distribution of precipitation in a year, especially the total rainfall from June to August, is a crucial factor for vegetation coverage and height. Present data show that it influences waste-land and cropland very obviously. And Crop canopy and height are determined by the total rainfall in the growth season. The results of this study are useful reference to estimating of vegetation parameters on the Loess Plateau and further to soil erosion modeling and the project of returning cropland to forest and grass.
Key words： Vegetation parameters; Vegetation height; Vegetation coverage; Soil loss.
ZHANG Yan,ZHANG Qing-chun, LIU Bao-yuan . STUDY ON VEGETATIVE COVERAGE AND HEIGHT VARIATION IN NORTHERN LOESS PLATEAU[J]. Advances in Earth Science, 2002 , 17(2) : 268 -272 . DOI: 10.11867/j.issn.1001-8166.2002.02.0268
［1］Renard K G, Foster G R, Weeies G A, et al. Predicting soil erosion by water. A Guide to Conservation Planning with the Revised Universal Soil Loss Equation (RUSLE)［C］. USDA Agric Handb No. 703, Washington DC: US Gov Print Office, 1997.
［2］Laflen M J, Lane L J, Forster G R. WEPP A new generation of erosion prediction technology ［J］. Journal of Soiland Water Conserversion,1991,46(1):34-38.
［3］De Roo A P J，Wesseling C G，Ritsema C J. LISEM: A singleevent physically based hydrological and soil erosion model for drainage basins［J］. I:Theory, Input and Output Hydrological Processes,1996,10:1 107-1 118.
［4］Ghebreiyessus Y R, Gregory J M. Crop canopy functions for soil erosion prediction［J］. Transactions of the ASAE, 1987,30(3):676-682.
［5］Zhang Guanghui, Liang Yimin. The seasonal change of artificial grassland coverage and its soil and water conservation benefit in loess hilly region［J］. Bulletin of Soil and Water Conservation, 1995,15(2): 38-43.［张光辉,梁一民.黄土丘陵区人工草地盖度季节动态及其水保效益［J］.水土保持通报,1995,15（2）:38-43.］
［6］Lal R. Soil Erosion Research Methods［M］. The Soil and Water Conservation Society and St Lucie Presss,1994.211-212.
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