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在毛乌素沙地采用样线法调查了油蒿植冠下生物结皮分布状况并对其影响因素进行了分析。结果表明:油蒿植冠下生物结皮厚度分布不均匀,生物结皮厚度的最大值出现在距油蒿根部20 cm处,厚度值为0.84 cm,20 cm处向外生物结皮厚度呈环带状降低,距离每增加10 cm生物结皮厚度平均下降约0.07 cm。东南方向上生物结皮分布半径长于其他3个方向,西北方向生物结皮分布半径短于其他方向;距油蒿根部相同距离处东南方向生物结皮最厚,西北方向生物结皮最薄。油蒿植株下生物结皮的分布与枯落物的分布关系密切,枯落物是影响油蒿植株下生物结皮形成的重要因素,同时枯落物的分布又受到油蒿植冠形态和当地风况的影响。
The distribution of biological crusts under the canopy of Artemisia ordosica and its influencing factors were investigated by using the sample-line method in Mu Us sandy land. The results showed that the thickness of biological crusts was unevenly distributed under the canopy of Artemisia ordosica. The maximum value of the thickness of the biological crust appeared at a depth of 20 cm from the root of Artemisia ordosica, and the thickness was 0.84 cm. The thickness of the outer crust was 20 cm Striped lower, the average thickness of the biological crust decreased by about 0.07 cm for every 10 cm increase in distance. The distribution radius of biological crusts in the southeast direction is longer than that in the other three directions, and the distribution radius of biological crusts in the northwest direction is shorter than that in other directions. The biological crusts are the thickest in the southeast direction and the thinnest in the northwest direction at the same distance from the roots of Artemisia ordosica. The distribution of biological crusts in Artemisia ordosica plants is closely related to the distribution of litter. Litter is an important factor that affects the formation of biological crusts under Artemisia ordosica plants. Meanwhile, the distribution of litter is influenced by the morphology of the canopy and local The impact of wind conditions.