不同降雨强度下北京山区典型林地土壤水分时空变化特征

发布时间：2018-11-11 14:37

【摘要】：通过ECH2O土壤水分监测系统和EM50数据采集器对北京山区2种典型人工林地(栓皮栎林和油松林)土壤水分含量进行定位、长期观测、数据处理,分析不同降雨强度对不同林分类型土壤水分时空变化特征及差异性的影响。结果表明:(1)栓皮栎林地和油松林地日平均土壤储水量随降雨量显著变化,月平均土壤储水量随降雨量的增加呈上升趋势。(2)在垂直方向上,栓皮栎和油松林地0—40cm土层土壤储水量的增加率随雨强增加而降低,栓皮栎林地土壤储水量平均增加率(94.17%)大于油松(84.19%),而40—100cm土层土壤储水量的增加率随雨强增加均呈现增加趋势,且油松林地土壤储水量平均增加率(15.81%)大于栓皮栎林地(5.83%)。(3)栓皮栎与油松林地相同土层土壤储水量差异性显著(p0.05),同一林地不同土层土壤储水量也到达差异性显著(p0.05)。从栓皮栎和油松林地的土壤水分时空变化特征来看,2种林地土壤储水量分布不同。在造林树种选择时,可以考虑将油松和栓皮栎2个树种进行混交。研究结果将为北京山区植被建设和管理提供参考和理论依据。
[Abstract]:The soil moisture content of two typical artificial forests (Quercus variabilis and Pinus tabulaeformis) in mountainous area of Beijing was determined by ECH2O soil moisture monitoring system and EM50 data collector. The effects of different rainfall intensity on the temporal and spatial variation and difference of soil moisture in different stand types were analyzed. The results showed that: (1) the daily average soil water storage in Quercus variabilis forest and Pinus tabulaeformis forest changed significantly with rainfall, and the monthly average soil water storage increased with the increase of rainfall. The increase rate of soil water storage in 0-40cm soil layer of Quercus variabilis and Pinus tabulaeformis forest decreased with the increase of rainfall intensity. The average increase rate of soil water storage in Quercus variabilis forest land (94.17%) was higher than that in Pinus tabulaeformis forest (84.19%). However, the increasing rate of soil water storage in 40-100cm soil layer showed an increasing trend with the increase of rainfall intensity. The average increase rate of soil water storage in Pinus tabulaeformis forest (15.81%) was higher than that in Quercus variabilis forest (5.83%). (3). The difference of soil water storage between Quercus variabilis and Pinus tabulaeformis forest was significant (p0.05). There were significant differences in soil water storage between different soil layers in the same forest land (p0.05). According to the temporal and spatial characteristics of soil moisture in Quercus variabilis and Pinus tabulaeformis forest land, the distribution of soil water storage was different. Two species of Pinus tabulaeformis and Quercus variabilis can be mixed in the selection of afforestation tree species. The results will provide reference and theoretical basis for vegetation construction and management in Beijing mountainous area.
【作者单位】：北京林业大学水土保持与荒漠化防治教育部重点实验室;
【基金】：国家重点研发计划项目(2016YFC0500802) 林果业生态环境功能提升协同创新中心(PXM2017_014207_000038) 北京市科技计划项目(Z151100001415002)
【分类号】：S714.2

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