摘要
为明确白于山区典型人工林土壤水分时空分布特征,为白于山区人工林植被群落的合理配置提供理论依据。选取樟子松、侧柏、油松、小叶杨典型林分,于2024年5月至11月使用土壤温湿度记录仪对10,20,40,100,200 cm处土层的土壤含水量进行测定,分析土壤水分的时空动态变化规律。(1)不同植被类型下0~200 cm剖面平均含水量呈“小叶杨>樟子松>油松>侧柏”的变化规律;(2)随着土层深度的增加,侧柏林、樟子松林的土壤水分呈先降低后增加或趋于稳定的趋势,小叶杨林、油松林200 cm处的水分并未出现缓解趋势;土壤干层内土壤平均含水量为小叶杨(7.31)>樟子松(7.07)>侧柏(6.37)>油松(6.37);(3)土壤水分日动态变化规律表明,任一林分土壤表层(0~40 cm)含水量均具有明显的波动趋势,除侧柏林外,200 cm处的土壤水分趋于平稳状态;(4)土壤水分月动态变化规律表明,任一林分土壤表层(0~40 cm)土壤含水量变化趋势相似,深层土壤的含水量变化相对较小,且不同植被类型的土壤含水量在夏季(7-8月)达到最高。4种林分条件下,小叶杨林、油松林的耗水深度可能超过2 m;油松林深层土壤水分亏缺最为严重;小叶杨、油松、樟子松林在2 m处没有发生入渗,侧柏林在1.0 m处入渗已经停止,后续可增设对山杏、山桃等乡土树种的研究。
To clarify the spatial-temporal distribution characteristics of soil moisture in typical plantation and provide theoretical basis for rational allocation of vegetation communities in Baiyu Mountain area,four typical forest stands,namely Pinus sylvestris var.mongholica,Platycladus orientalis,Pinus tabuliformis,Populussimonii,were selected.From May to November 2024,soil moisture content was measured at soil depths of 10 cm,20 cm,40 cm,100 cm,and 200 cm using soil temperature and humidity recorders to analyze the spatio-temporal dynamic changes of soil moisture The results indicated:(1)The average soil moisture content in the 0-200 cm profile varied among different vegetation types,following the order:Populus simonii>Pinus sylvestris var.mongholica>Pinus tabuliformis>Platycladus orientalis.(2)With soil depth increased,the soil moisture of Platycladus orientalis forest and Pinus sylvestris var.Mongholica forest decreased first and then increased or tended to be stable,while the moisture content in the 200 cm area of Populussimonii forest and Pinus tabuliformis forest did not show a relief trend.The average soil moisture content in dry layer was Populus simonii(7.31)>Pinus sylvestris var.mongholica(7.07)>Platycladus orientalis(6.37)>Pinus tabuliformis(6.37).(3)The diurnal dynamics of soil moisture indicated that the soil moisture content in the surface layer(0-40 cm)of all stands exhibited significant fluctuations,and the soil moisture at 200 cm tended to stable,except for Platycladus orientalis forest.(4)The monthly dynamics of soil moisture showed that the soil moisture content in the surface layer(0-40 cm)of all forest stands had similar variation trends,while the change of soil moisture content in the deep soil was relatively small,and the soil moisture content of different vegetation types reached the highest in summer from July to August.Under the four forest stand conditions,the water consumption depth of Populus simonii forest and Pinus tabuliformis forest might exceed 2 m.The deep soil moisture deficit of Pinus tabuliformis forest was the most severe.Infiltration did not occur at 2 m in Populus simonii forest,Pinus tabuliformis forest,and Pinus sylvestris var.Mongholica forest,while infiltration had already ceased at 1.0 m in Platycladus orientalis forest.Future research could focus on native tree species such as Prunus sibirica and Amygdalus davidiana.
作者
刘碧波
吕俊林
刘彦丁
石长春
马雅莉
杨行松
陈尧
LIU Bi-bo;LV Jun-lin;LIU Yan-ding;SHI Chang-chun;MA Ya-li;YANG Hang-song;CHEN Yao(Yulin Forestry Work Station,Yulin,Shaanxi 719000;Shanxi Academy of Forestry,Xi'an,Shaanxi 710082;Shaanxi Yulin National Observation and Research Station for Mu Us Sandy Land Ecosystem,Yulin,Shaanxi 719000;College of Forestry,Northwest A&F University,Yangling,Shaanxi 712100)
出处
《陕西林业科技》
2025年第5期36-41,共6页
Shaanxi Forest Science and Technology
基金
陕西省榆林市发展和改革委员会资助项目(2023-YLSFGW-60)
陕西省榆林市科学技术局2024年市级科技计划项目(2024-CXY-188)
陕西林业科技创新青年人才培育专项(SXLK2023-06-6)
榆林市科技计划项目(YF-2022-9、YF-2022-11)
榆林市委、市政府专项“榆林防止二次沙化与水土流失调查研究”(榆政财资发〔2021〕47号)。
关键词
白于山区
典型林分
土壤水
动态
Baiyu Mountainous area
typical stand
soil moisture
dynamic state
