不同行距黄柳沙障结皮理化性质的研究

Physical and Chemical Properties of Soil Crust in Salix Gordejevii Sand Barrier with Different Distances of Row Spacing

在实验和对比分析的基础上,对行距5 m和8 m黄柳沙障基部处和远离基部2 m处(对照样)结皮理化性质进行了研究。结果表明,沙障基部处土壤的pH值呈碱性,对照样土壤的pH值呈酸性。两种不同行距黄柳沙障之间的pH值无显著差异。行距5 m和8 m黄柳沙障基部处的有机质、全N和全P含量均大于对照样。而对于速效养分,行距5 m和8 m黄柳沙障基部处速效P含量都大于对照样,而行距5 m和8 m黄柳沙障对照样速效N含量则大于基部处,并且行距8 m的黄柳沙障基部处和对照样速效N和速效P含量均大于行距5 m的黄柳沙障。黄柳沙障下结皮的形成是以砂粒为骨架,以小于0.02 mm的细小颗粒填塞土壤孔隙的一个物理过程。

Based on field experiment and comparative analysis, physical and chemical properties of soil crust at the base of the Salix gordejevii sand barrier with row spacing of 5 m and 8 m and at 2 m away from the base （for contrast） are investigated. Results show that soil is alkaline at the base of the two row Salix gordejevii sand barrier, while soil at 2 m away from the base is acidic. The soils in the 5 m and 8 m row spacing sand barriers do not have significant difference in pH value. The content of organic matter, total N, and total P at the base of the sand barrier are greater than the contrast. Compared with the base and the location 2 m away from the base, available nutrients in both 5 m row spacing and 8 m row spacing are higher and available N are lower than the contrast. Both available N and available P in 8 m row spacing sand barrier are greater than those in 5 m row spacing sand barrier. The formation of soil crust in the Salix gordejevii sand barrier is a physical process which takes sand grains as skeleton and fill soil pore space with the fine kernel （d〈0.02 mm）.