摘要
土壤侵蚀导致东北黑土坡耕地土地质量严重退化,研究东北黑土区典型坡耕地的土壤侵蚀规律,对控制坡耕地的水土流失以及深化土壤侵蚀规律的认识具有重要的意义。本研究通过采集开垦近100年的黑土直型坡耕地的土壤样品,利用137Cs示踪技术,结合小波分析方法,研究了长坡长直型坡耕地50多年来土壤侵蚀强度的空间变化规律,结果显示4个断面顺坡方向上的坡面侵蚀强度均存在着坡长为142m的强弱交替变化的波动周期,这反映了长坡长直型坡土壤在长期的降雨侵蚀过程中,泥沙沿坡面输移的强弱交替变化。通过对4个断面的侵蚀速率的数学拟合发现,用正弦函数的和拟合的结果最好,R2均在0.96以上,进一步说明了直型坡面侵蚀随坡长变化的波动性规律。所研究的断面控制面积内平均侵蚀速率为3054 t.km-2.a-1。
The soil quality of the northeast black soil cultivated slopes had been degenerated seriously due to soil erosion.An understanding of the spatial distribution of soil erosion was important for designing conservation programs and deepening the soil erosion rules.In this paper,soil samples were collected on a long and straight cultivated slope which located in keshan county in Helongjiang Province along 4-transects,and the spatial distribution of soil erosion intersity was studied using ^（137）Cs measurement and wavelet analysis.The results showed that there existed a fluctuant period of soil erosion intensity with 142m along 4 transects downslope,which suggested that the downslope intensity of soil transporting alternately changed between weak and strong during the impact of long-term erosive rainfall.Moreover the average erosion rate within the study area was 3054t·km^（-2）·a^（-1）,the best fitting result（R^20.96） of the soil erosion rates along the four transects was the sum of sine function.It was further convinced the correctness of the fluctuant of the erosion intensity on the study slope.
出处
《核农学报》
CAS
CSCD
北大核心
2010年第1期98-103,87,共7页
Journal of Nuclear Agricultural Sciences
基金
国家重点基础研究发展规划"973"(2007CB407201)
教育部"新世纪优秀人才"支持计划
关键词
土壤侵蚀强度
空间分布
小波分析
137Cs
坡耕地
黑土
soil erosion intensity
spatial distribution
wavelet analysis
（）^（137）Cs
cultivated slope
black soil
