收稿日期: 2001-12-07
修回日期: 2001-12-28
网络出版日期: 2002-04-01
基金资助
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”（G2000018602）；教育部骨干教师项目资助.
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
植被特性及生长模式是土壤侵蚀研究的重要因子，而降水是植被生长的主要限制因素。通过 3年的观测数据，分析了陕北黄土高原地区降水年际变化和年内变化对 6种植被覆盖度和高度的影响，得到如下主要结论：①年降水量对刺槐林、灌木林、荒草地和农地植被的影响较大，平水年份和干旱年份最大覆盖度相差约一倍。而对于植被高度来说，受影响最大的是休闲地和农地植被。②降水的年内分布，尤其是 6～8月份的降水量是限制植被覆盖度和高度的主要原因。对于荒草地、农耕地覆盖度和高度的影响尤为显著。农作物覆盖度、高度甚至每年播种日期和种类都受到生长季降雨量的制约。研究结果对于估计黄土高原地区植被参数的变化，以及对土壤侵蚀模拟和退耕还林还草都具有参考价值。
张岩 , 刘宝元 , 张清春 . 降水变化对陕北黄土高原植被覆盖度和高度的影响[J]. 地球科学进展, 2002 , 17(2) : 268 -272 . DOI: 10.11867/j.issn.1001-8166.2002.02.0268
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.
［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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