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通过建立米级的空间尺度进行分层取样,研究了准噶尔盆地南缘建群种——梭梭(Haloxylon ammodendron)主根周围土壤的含水率、容重、pH值、电导率和养分含量的变化状况。结果表明:(1)土壤含水量在表层5cm处最小,土壤容重在0~40cm土层变动幅度不大,但随着与茎基垂线距离的增加,二者出现显著变化(p<0.05)。(2)土壤pH值和电导率在主根区周围呈现聚集现象,最大聚集率均在0~1m圈层,但随着距离的增加,土层深度逐渐成为主导因素。(3)土壤养分在表层5cm处聚集,但水平聚集范围中除有机质和全氮可扩增到3~4m外,全磷和速效养分均在0~2m。本研究结论对于荒漠区耐盐性植被的合理密植有一定的理论意义。
Through the establishment of rice scale sampling, the changes of water content, bulk density, pH value, conductivity and nutrient content of soil around the main root of Haloxylon ammodendron were studied. The results showed that: (1) The soil water content was the smallest at the surface 5 cm, and the soil bulk density was not affected by the soil bulk density at 0-40 cm. However, the soil water content showed significant changes (p <0.05) . (2) Soil pH and conductivity showed aggregation around the main root zone, and the maximum accumulation rate was in 0 ~ 1m circle, but with the increase of distance, soil depth gradually became the dominant factor. (3) Soil nutrients aggregated at the surface layer 5cm, but the total phosphorus and available nutrients were 0 ~ 2m except for organic matter and total nitrogen could be amplified to 3 ~ 4m. The conclusions of this study have certain theoretical significance for the rational close planting of salt-tolerant vegetation in the desert area.