2个密度樟子松人工固沙林土壤水分动态变化研究

Dynamic Changes of Soil Moisture ofPinus sylvestris var. mongolica Artificial Sand Fixation Forest with Two Densities

通过对生长季章古台290、855株hm^-22种密度樟子松人工固沙林及对照草地内0~180 cm层次土壤含水率进行的监测,对樟子松人工固沙林的土壤含水率及其与降水的相关性进行分析。结果表明:0~50 cm层次土壤含水率,2个密度林分互有高低;100 cm层次以下,低密度林分土壤含水率高于高密度林分;100~180 cm层次,草地土壤含水率均高于樟子松林分。湿润年份里,高密度樟子松人工林20~50 cm层次土壤含水率高于低密度林分;在半湿润半干旱的章古台,低密度林分对于土壤水分的调控要好于高密度林分,樟子松人工固沙林的经营要适时间伐才能应对干旱胁迫。

Through monitoring of Pinus sylvestris var.mongolica artificial sand fixation forest with two densities(290,855 strain hm^-2)in Zhanggutai Region and the soil moisture content in the 0-180 cm layer in the control grassland during the growing season,the soil moisture content of Pinus sylvestris var.mongolica artificial sand fixation forest and the correlation with precipitation were analyzed.Result shows that:Pinus sylvestris var.mongolica stands with two densities have different moisture contents at 0-50 cm soil layer;below 100 cm soil layer,the soil moisture content of the low-density Pinus sylvestris var.mongolica is higher than the that with high-density.In humid years,the soil moisture content of the high-density Pinus sylvestris var.mongolica plantation at 20-50 cm is higher than that of the low-density stand,but in the semi-humid and semi-arid Zhanggutai Region,the low-density stand has optimal regulation of soil moisture than that of the high-density stand.In addition,the management of Pinus sylvestris var.mongolica artificial sand fixation forest requires timely thinning to cope with drought stress.