小型人工沙棘林对砒砂岩沟道土壤有机质与水分的影响

Effects of small-scale artificial Seabuckthorn forest on soil organic matter and soil moisture in the soft rock region gully

在内蒙古砒砂岩典型地区的准格尔旗东一支沟开展了小型人工沙棘植物林水保生态效应野外试验。根据试验数据,分析与研究了沙棘植物对沟道土壤有机质及土壤含水率的影响,揭示了沙棘植物对砒砂岩沟道土壤改良及对沟道土壤水分的调控效应,可为沙棘植物治理砒砂岩地区水土流失提供理论依据。结果表明:小型人工沙棘林的土壤剖面(0～100cm)有机质平均值约是对比沟土壤有机质均值的2倍,沙棘植物可显著提高并改善沟道土壤肥力。沙棘植物影响了有机质沿土壤剖面分布格局,各小型人工沙棘林土壤有机质沿土壤剖面(0～100cm)分布表现为大"U"型,而对比沟土壤有机质沿土壤剖面(0～100cm)分布表现为"L"型。各小型人工沙棘林沿土壤剖面(0～100cm)的土壤含水率平均值约是对比沟的1.37倍,都显著大于对比沟。沙棘植物对沟道土壤含水率具有明显调节作用,能有效增加沟床地下土壤水库库容,有利于沟床植物群落的生长,发挥沙棘植物拦沙保水、抑制土壤侵蚀的功能。

An experiment on the soil and water conservation and ecology effects of the small-scale artificial seabuckthorn forest was carried out in the east-one gully located in the typical soft rock region in Zhun-ge-er County,Inner Mongolia.Based on the experimental data,it was analyzed and studied the effects of seabuckthorn vegetation on gully soil organic matter and soil moisture content,and it was revealed the improvement and soil moisture regulative and controllable effects of seabuckthorn vegetation on gully soil in soft rock region,which could provide theoretic proof for controlling soil and water loss in soft rock region.The results showed that the average soil profile（0～100cm） organic matter was 2 times that of the contrast gully,and this suggested the seabuckthorn vegetation could strikingly boost and improve gully soil fertility.Seabuckthorn vegetation had an important effect on the profile soil organic matter distribution in different gully soil positions,and the profile（0～100cm） soil organic matter distribution of each small artificial seabuckthorn forest was like big ＂U＂ form,while that of the contrast gully was like ＂L＂ form.Average profile soil water content of each of all small artificial seabuckthorn forests was evidently more than that of the control gully soil,and the average profile（0～100cm） soil water content of them was almost 1.37 times that of the control gully soil.Seabuckthorn vegetation could evidently exerted an forcefully adjust ability to gully soil moisture content,and this could effectively add the storage capacity of gully soil reservoir and help the growth of earth vegetation community,and play an active part in confining water and sediment and controlling soil erosion.