干旱风沙区营造人工柠条林对退化沙地土壤水分运动参数的影响

以宁夏盐池沙区退化沙地为研究对象,探讨其在营造人工柠条灌木林后,对土壤水分运动参数的影响,研究结果显示:退化沙地营造人工柠条林后,0～40 cm土层的土壤水分扩散率呈现增加的趋势;0～40 cm土层的土壤基质势明显低于对照天然草地;0～40 cm土层的土壤比水容量随造林密度的增加测定值降低;0～40 cm土层的土壤比水容量林地明显低于对照天然恢复草地;人工柠条林土壤非饱和导水率显著低于对照天然草地,其大小排序为天然草地>2 490丛.hm-2柠条林>1 665丛.hm-2柠条林>3 330丛.hm-2柠条林。

Effect of Constructing Artificial Caragana Intermedia on Soil Hydraulic Properties in Degeneration Sand of Arid Wind-Desert Region

Taking the degeneration sand of Yanchi desert region in Ningxia as the research object,the effect of the degeneration sand after constructing the artificial Caragana intermedia on soil hydraulic properties was discussed.The results show that soil moisture diffusivity under 0～40 cm soil layer increases after constructing the artificial Caragana intermedia in the degeneration sand;soil matrix potential under 0～40 cm soil layer is obviously lower than the compared natural grassland;the measured values of specific water capacity under 0～40 cm soil layer decrease with increment of afforestation density;and in this layer,soil water capacity in the forests was lower obviously than the compared recovery natural grassland;Soil unsaturated hydraulic conductivity in the artificial Caragana intermediate is significantly lower than the compared natural grassland,its size compositor is:natural grassland> 2 490 clump·hm-2 Caragana intermediate> 1 665 clump·hm-2 Caragana intermedia>3 330 clump ·hm-2 Caragana intermedia.