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对腾格里沙漠东南缘沙坡头地区1989年建植人工植被区优势固沙灌木柠条(Caragana korshinskii)和半灌木油蒿(Artemisia ordosica)树干茎流及穿透雨的pH值,以及灌丛基部、灌丛下和灌丛外裸地0~10cm和10~20cm剖面深度土壤pH值分别进行测定,并与大气降雨pH值进行比较,以探讨荒漠灌丛降雨再分配对土壤pH值空间变异的影响。结果表明:大气降雨pH值最高,穿透雨pH值次之,树干茎流pH值最低,三者之间具有显著差异(p<0.05)。灌丛外裸地土壤pH值最高,灌丛下次之,树干基部最低。总体而言,0~10cm剖面深度土壤pH值小于其下方10~20cm剖面深度土壤pH值。柠条灌丛产生的树干茎流对土壤的酸化作用强于油蒿灌丛。树干茎流和穿透雨的酸化作用是导致土壤pH值从灌丛间裸地到灌丛基部方向上降低的一个重要原因。
The pH values of stem-flow and through-rains in the dominant Caragana korshinskii and Artemisia ordosica plants in the artificial vegetation area of 1989 in Shapotou, southeast of the Tengger Desert, Soil pH values at depths of 0 ~ 10cm and 10 ~ 20cm were measured under basal, shrubs and bare shrubs, respectively, and compared with that of rainfall in the atmosphere to investigate the effects of rainfall redistribution on spatial variability of soil pH value Impact. The results showed that: the highest rainfall in the atmosphere, the penetration of rain followed by pH, the lowest stem pH value of the stalk, a significant difference between the three (p <0.05). The highest soil pH value was found in shrubs, followed by shrubs and lowest in the base of trunk. In general, the soil pH at 0-10 cm depth is less than the soil depth at 10-20 cm depth below. The stem sap flow from Caragana korshinskii shrubs was more effective on soils than that of Artemisia ordosica shrubs. The stem-flow and through-rain acidification is an important reason for the decrease of soil pH in the direction from the bare land to the base of shrub.