【摘要】 为探究密度调控措施对冀北山区油松人工林枯落物水文特征的影响,以冀北山区油松人工林为研究对象,采用样地调查和室内浸泡法分析4种林分密度油松人工林未分解层和半分解层枯落物储量、枯落物持水特征、枯落物持水量、吸水速率及其与持水时间的关系。结果表明:(1)油松人工林4种林分密度的枯落物储量由大到小排序依次为1 785株/hm2(24.40t/hm2)、1 365株/hm2(24.03t/hm2)、1 050株/hm2(23.20t/hm2)、2 100株/hm2(21.00t/hm2);(2)枯落物的最大持水量为32.20～41.80t/hm2,最大持水率的范围为202.82～243.57t/hm2,有效拦蓄量在23.35～16.44t/hm2之间;半分解层枯落物持水量均大于未分解层,4种密度调控处理对枯落物未分解层持水过程影响并不显著,1 365株/hm2的半分解层枯落物持水能力明显高于其他3种林分密度;(3)4种林分密度油松人工林土壤的平均容重0.93～1.10g/cm3,按其排序4种密度由大到小依次为1 365株/hm2、1 785株/hm2、1 050株/hm2、2 100株/hm2;土壤总孔隙度51.83%～53.83%,按其排序4种密度由大到小依次为1 365株/hm2、1 785株/hm2、1 050株/hm2、2 100株/hm2;(4)油松人工林4种林分密度下土壤的有效持水量130.92～138.71t/hm2,按其排序4种密度由大到小依次为1 365株/hm2、1 785株/hm2、1 050株/hm2、2 100株/hm2,土壤最大持水量的变化范围为648.91～671.05t/hm2。更多还原

【Abstract】 In order to explore the effects of varying thinning on hydrological characteristics of forest litter,Pinus tabulaeformis plantation in northern Hebei province was selected as the research object.The relationships between litter reserves,litter water holding capacity,water holding capacity and water absorption rate of litter and its holding time under different density control treatments were analyzed by plot investigation and indoor immersion method.The results showed that:(1)the order of litter size of 4 kinds of density control was light regulation(24.40 t/hm2),moderate regulation(24.03 t/hm2),severe regulation(23.20 t/hm2),and control intensity(21.00 t/hm2).(2)The maximum water holding capacity litter was 32.20～41.80 t/hm2,the maximum water holding rate range was 202.82～243.57 t/hm2,the modified interception amount in 23.35～16.44 t/hm2.Semi-decomposed litter water holding capacity was larger than the undeconposed layer.The effects of 4 kinds of density control treatments on water retension of litter undeveloped layer was not significant.Semi-decomposed litter water holding process of moderate regulation is significantly higher than that of mild and severe intensity regulation and control regulation.(3)The average bulk density of soil under 4 kinds of density controlled forest types was 0.93～1.10 g/cm3;and the size order was moderate control,mild control,severe control and control intensity;the total soil porosity was 51.83%～53.83%,and the order of porosity size was moderate control,mild control,severe control and control intensity.(4)the effective water holding capacity of soil under 4 kinds of density regulated soil types was 130.92～138.71 t/hm2,and the size order was moderate control,mild control,severe control and control intensity;and the maximum soil water holding capacity was 648.91～671.05 t/hm2.更多还原