摘要
不同林地类型土壤水分的垂直变化规律在一定程度上反映了林分消耗土壤水分及其稳定性的特征。选取陕北黄土区3种典型人工林地—油松林、山杏林和沙棘林下土壤水分为研究对象,选取荒草地为对照组,分析研究其土壤水分在0-180 cm土层内的垂直分布规律及剖面垂直分层特点。结果表明：人工油松林地及山杏林地土壤含水量随土层深度的增加呈逐渐减少趋势,减小速率分别是0.019 3、0.020 9%/cm,人工沙棘林地及荒草地土壤含水量随土层深度的增加呈逐渐增加趋势,增加速率分别为0.004 6、0.086 3%/cm;根据变异系数法,土壤水分垂直剖面可分为速变层、活跃层和次活跃层3个层次,分层结果与使用有序聚类法分类的结果较为一致。
Soil moisture is one of the main factors that restrict vegetation growth,vegetation restoration and stand stability on the Loess Plateau in northern Shaanxi province. It also shows obvious temporalspatial characteristics under different land use types,topography and geomorphology,and vegetation conditions due to the effects of rainfall,surface runoff,plant transpiration,root absorption and so on.The vertical distribution of soil moisture in artificial forests reflects the characteristics of soil water consumption and stability of forest lands. Thus,the study of soil moisture in vertical profiles is important for understanding the utilization of soil moisture in artificial forests. The aim of this study was to investigate the distribution and the hierarchical characteristics of soil moisture at the 0- 180 cm layer in vertical profiles. In order to analyze it,three types of typical artificial forests on the Loess Plateau in northern Shaanxi province,namely Pinus tabulaeformis,Armeniaca sibirica and Hippophae rhamnoides,were selected as the research object. Meanwhile,waste grassland in the same stand conditions was used as a reference group. The time domain reflection（ TDR） was chosen to measure the soil moisture between0 cm and 180 cm in vertical profiles. During the period from August 2010 to June 2013,the soil moisture contents were measured 3 times in every 20 cm layer. Moreover,in each observation,the probe of TDRwas rotated 120° in horizontal direction. The sequential clustering method and the variation coefficient method were combined in this study in order to classify the soil layer by moisture. Results show that the soil moisture contents of Pinus tabulaeformis and Armeniaca sibirica forests were decreased respectively by0. 019 3% / cm and 0. 020 9% / cm with increasing soil depth（ 0- 180 cm）,while the soil moisture contents of Hippophaer hamnoides forest and waste grassland were increased with the rate of 0. 004 6% /cm and 0. 086 3% / cm,respectively. Nevertheless,the soil moisture contents of the
出处
《中国水土保持科学》
CSCD
北大核心
2015年第6期54-60,共7页
Science of Soil and Water Conservation
基金
林业公益性行业科研专项"黄土丘陵严重侵蚀区植被恢复和重建技术研究"(201104002-2)
关键词
人工林
土壤水分
垂直变化
黄土区
plantation
soil moisture
vertical variation
Loess Plateau
