沙棘"柔性坝"对沟底土壤有机质影响的现场试验

有机质是土壤肥力最重要的组分之一,是评价土壤质量和健康状况的重要指标。2006年试验测定了种植沙棘"柔性坝"的沟道内不同位置、不同深度的土壤有机质含量,同时与东一支沟左岸一条未种植沙棘的小支沟进行了对比分析。试验结果表明:坝内有机质的垂向分布不仅与土壤的发育过程和土层结构有直接联系,而且与土壤中的水分运移过程密不可分;种植沙棘"柔性坝"的沟道内土壤的有机质含量明显高于未种植沙棘"柔性坝"的对比沟道,而且在相同时期种植的沙棘"柔性坝"内不同取样点处的有机质含量总和相当接近;种植沙棘"柔性坝"的沟道内土壤异质性不显著,但与未种植沙棘的沟道相比,土壤的空间异质性较大,建议对这一问题应采用更大的空间尺度进行深入研究。

Effect of Sea-buckthorn Plant Flexible Dams on Soil Organic Matter in Valley Bottom

As one of the most important soil fertility elements,soil organic matter is also the index in evaluating the soil quality and health.In this paper,soil organic contents in both valleys with sea-buckthorn dams planted and another small valley without sea-buckthorn dams in Xi-Zhao watershed were measured and analyzed.It was revealed that the vertical distribution of organic matter was closely related to soil water transmission process as well as soil's development process and layer structure,and with the same growth period,the total organic contentsat different locations were very close in sea-buckthorn plant flexible dams.Also,in the valleys with sea-buckthorn,the soil heterogeneity was not very obvious.However,in the valley without sea-buckthorn dams,soil heterogeneity was so distinct that more research is needed in bigger scale range for the future.