摘要
为揭示黄河三角洲人工刺槐林的退化机理及其土壤水分生态特征对退化程度的响应关系,采用野外典型抽样调查分析和室内分析测定相结合的方法,在黄河三角洲地区研究了退化刺槐林地土壤水文物理性状、土壤入渗特性及土壤贮水性能的差异。结果表明,随着刺槐林退化程度的加剧,林地土壤的容重增加,而土壤有机质、孔隙度和孔隙比等表征土壤水文物理性质的指标明显降低,0—20cm土层土壤指标状况好于20—40cm土层。轻度、中度、重度退化刺槐林地的土壤容重与未退化相比分别增加了3.68%,9.56%,14.71%;总孔隙度降低2.38%,4.86%,9.57%。Horton模型比较适合描述退化刺槐林地土壤水分入渗过程,随着退化程度的加剧,初渗率和稳渗率均表现出降低趋势。轻度、中度、重度退化类型下的稳渗速率值分别比未退化(4.02mm/min)下降了25.62%,55.47%,85.07%。刺槐林地土壤吸持、滞留贮水量、土壤涵蓄降水量、有效涵蓄量也表现出降低趋势,0—20cm土层的贮水性能均强于20—40cm土层,轻度、中度、重度退化类型下的40cm土层土壤饱和贮水量分别比未退化(195.78mm)下降了2.37%,4.85%和9.56%。
In order to reveal the driving mechanisms of Robinia pseucdoacacia plantation and the responses of ecological characteristics of soil moisture to plantation degradation,the soil hydrologic-physical characteristics,infiltration,and water-holding capacity in degraded R.pseucdoacacia plantation in the Yellow River Delta area are studied using the methods of representative field investigation and laboratory analysis.Results showed that with the degradation of R.pseucdoacacia plantation,soil hydrologic-physical properties such as soil organic matter,soil porosity,and void ratio decreased with increased soil density and soil hydrologic-physical properties in the 0—20 cm layer was better than those in the 20—40 cm layer.Soil porosity in slightly,medially and badly degraded stands increased by 3.68%,9.56%,and 14.71%,respectively,compared with normal stand,and however,total soil porosity decreased by 2.38%,4.86%,and 9.57%,respectively.Horton infiltration model can better describe the infiltration process in the degraded R.pseucdoacacia plantation.With the degradation of R.pseucdoacacia plantation,initial infiltration rate and stable infiltration rate decreased greatly.Similarly,stable infiltration rate decreased by 25.62%,55.47%,and 85.07%,respectively,compared with normal stand（4.02 mm/min）.Total water-storage capacity deceased by 2.37%,4.85%,and 9.56%,respectively,compared with normal stand（195.78 mm）.Soil capillary and non-capillary porosity,water-holding capacity,total soil absorption precipitation,and effective precipitation decreased greatly.Soil water-holding capacity in the 0—20 cm layer was better than that in the 20—40 cm layer.
出处
《水土保持通报》
CSCD
北大核心
2010年第6期75-80,共6页
Bulletin of Soil and Water Conservation
基金
国家"十一五"林业科技支撑计划"盐碱地改良沿海防护林体系研究与示范"(2009BADB2B05)
国家自然科学基金项目"黄河三角洲湿地生态安全评价研究"(30770412)
滨州学院重大课题"黄河三角洲盐碱地植被修复技术研究"(2008ZDL03)
关键词
刺槐林
黄河三角洲
土壤入渗
土壤贮水
土壤退化
Robinia pseucdoacacia plantation
the Yellow River Delta
infiltration
soil water-holding
soil degradation
