冀北山地华北落叶松混交林土壤水分物理性质研究

土壤是森林生长的基础,土壤水分物理性质是土壤质量的重要指标之一。以冀北山区不同树种组成比例(类型1—9落1黑桦;类型2—5落3白桦2椴;类型3—2落6白桦2黑桦)的华北落叶松林为研究对象,分析和比较了不同林分下的土壤水分物理性质。结果表明:土壤容重的均值大小顺序为类型1(1.14g?cm~(-3))类型2(1.01g?cm~(-3))类型3(0.98g?cm~(-3));土壤总孔隙度排序为类型2(53.04%)类型1(51.84%)类型3(51.40%);土壤最大持水量排序为类型2(55.53%)类型3(52.81%)类型1(48.22%);土壤稳渗速率大小排序为类型2类型3类型1。类型2的土壤水分物理性质最好,说明阔叶树种比例的增加有利于发挥林分的土壤水文功能。

Physical Properties of Soil Water in Mixed Forest of Larix principis-rupprechti in Northern Mountain of Hebei Province

Soil is the foundation of growth of forest;soil water-physical property is one of the important indicators of soil quality.Taking Larix principis-rupprechtii plantation composed by different tree species (type 1—9 L.prin-cipis-rupprechtii +1 Rhamnus maximovicziana;type 2— 5 L.principis-rupprechtii+3 Betula platyphylla +2 Tiliatuan;type 3—2 L.principis-rupprechtii+6 Betula platyphylla +2 Rhamnus maximovicziana)in North-ern mountain of Hebei Province as research object,physical properties of soil moisture under different stand were analyzed.Result shows that the descending order of average value for soil bulk density size is type 1 (1.14 g cm-3 )> type 2 (1.01 g cm-3 )> type 3 (0.98 g cm-3 );total soil porosity is type 2 (53.04%)> type 1 (51.84%)>type 3 (51.40%);the descending order of the maximum water holding capacity of soil is type 2 (55.53%)> type 3 (52.81%)> type 1 (48.22%);final infiltration rate of the soil is type 2> type 3> type 1.Generally speaking, physical property of soil moisture of the type 2 is optimal.It illustrates that the increase of the proportion of broad-leaved tree species is beneficial to the soil hydrological function of the stand.