摘要
通过定位观测与对比分析,对辽宁省西北部沙地不同人工林地植物水分亏缺度与植物水分亏缺补偿度的时空分布进行了研究。结果表明：不同植被的植物水分亏缺度大部分时间在25%以下,油松纯林地在乔木林地中植物水分亏缺度最小,亏缺度大部分时间都在30%以下,杨树林地高于油松林地,而樟子松林地最高,除油松林地以外,其它几种乔木林地的水分亏缺度都处于水分极度亏缺的状况;乔木林和灌木林地水分亏缺度大致相当。降雨对土壤水分有一定的补偿作用,几种调查的乔灌木林地的水分补偿度都小于荒草地,樟子松林地、油松林地、杨树林地、松杨混交林地、山杏林地的水分补偿度基本在0~20%之间。植物水分补偿度（亏缺度）在垂直分布上和根系的分布相一致,即表层的补偿度最低,随深度的增加,补偿度急剧上升,40 cm以后变化比较平缓。110 cm以后,随着根系分布的减少,植物水分补偿度开始保持稳定,其中,樟子松林地和杨树林地的土壤水分补偿量小于10%,其它几种的土壤水分补偿量在20%~30%之间。
Plant water deficit degree and the spatio-temporal distributions of compensation degree of plant water storage deficit in the artificial forest of Liaoning northwestern sandy land were studied by position-monitoring and comparatively analyzing. The results showed that the deficit degree of plant water storage was less than 25 % during the studied period. In high forest, the highest deficit degree was found in pure Pinus sylvestris var. mongolica forest, followed by in pure Poplar plantation forest, and the lowest deficit degree was found in pure pine （P. tabulaeformis） forest, which was less than 30% during the studied period. The deficit degree in timber woods was almost equivalent to that in shrub woods. It was also found that rainfall might make soil moisture get some compensation to a certain extent. The compensation degree of plant water varied from 0-25% in P. sylvestris var. mongolica forest, P. tabulaeformis forest, P. plantation forest, pinus-poplar mixed forest and almond land, which in brief, was smaller in timber and shrub woods than in grassland. In vertical direction, the spatial change of plant water deficit degree was in consistent with the distribution of plant root system. The compensation degree of plant water in surface layer was the minimum, along with the increase of the depth, the compensation degree increased rapidly, in 40 cm layer it increased gradually. In 110 cm layer, the compensation degree showed little increase with the decrease of root quantity. Of these investigated the artificial forest, the compensation degree of soil moisture was smaller than 10% in P. sylvestris var. mongolica forest and poplar forest, ranging from 20%-30% in other artificial forest.
出处
《水土保持学报》
CSCD
北大核心
2009年第4期86-90,共5页
Journal of Soil and Water Conservation
基金
辽宁省教育厅科学研究计划资助(20060381)
关键词
辽西北沙地
土壤水分亏缺
人工林
sandy land in northwestern Liaoning province
soil water deficit
artificial forest
