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在古尔班通古特沙漠南缘中国科学院阜康荒漠生态站北沙窝试验区,分别选取沙垄顶、沙垄间不同下垫面条件(裸地和梭梭)的沙漠土壤进行双环入渗试验,研究沙垄和垄间梭梭树下,距树干不同距离(50,100,150,200cm)和不同方向(东、西、南、北)稳定入渗速率变化规律。实验结果表明:梭梭树周围不同距离的沙垄和垄间稳定入渗率与孔隙度变化规律趋于一致;梭梭树下稳定入渗率在距树干较近时最大,随着距离的增加而呈放射状迅速下降,这一关系可用指数函数表示,沙垄间:K=3.9266e-0.2466(LR2=0.959),沙垄上:K=8.4713e-0.0739L(R2=0.933);沙垄顶上的稳定入渗率值为垄间相应位置处的3～6倍,梭梭周围二者具有相似的变化规律。
In the desert zone of Beibeiwo of Fukang Desert Ecological Station, Chinese Academy of Sciences, on the southern edge of the Gurbantunggut Desert, the desert soils with different underlying surface conditions (bare land and Haloxylon ammodendron) Permeability test to study the variation of steady infiltration rate under different velocities (50, 100, 150, 200 cm) and different directions (east, west, south and north) The experimental results show that the stable infiltration rate and porosity of the ridge and ridge at different distances around Haloxylon ammodendron tend to be consistent. The steady infiltration rate under the Haloxylon ammodendron tree is the largest when it is near the trunk. With the increase of the distance While the radial drop rapidly, the relationship can be exponential function that the sand dune between: K = 3.9266e-0.2466 (LR2 = 0.959), the sand dune: K = 8.4713e-0.0739L (R2 = 0.933) The steady infiltration rate is 3 ~ 6 times higher than the corresponding position of the ridge, and both have similar changing rules around Haloxylon ammodendron.