白龍江上游不同海拔梯度灌叢土壤滲透性能分析
發(fā)布時間:2019-05-24 06:44
【摘要】:對甘肅白龍江上游灌叢植被類型的土壤性狀進行了研究,結(jié)果表明:(1)隨海拔梯度的增加平均土壤密度、毛管孔隙度和非毛管孔隙度的變化差異較大。土壤平均密度在0.85~1.69 g·cm~(-3)之間,隨著海拔的升高平均密度有逐漸減小的趨勢,但在海拔梯度E(2 750~3 000 m)時平均密度最大,在E海拔梯度時0~10 cm土壤密度較小;平均孔隙度在24.41~66.22%之間,非毛管孔隙度在1.54~12.81%之間,孔隙度和密度呈負相關(guān)。(2)隨著海拔梯度的增加毛管持水量、最大持水量、最小持水量都表現(xiàn)出先增加,到海拔梯度E(2 750~3 000 m)時減小,這與毛管孔隙度變化表現(xiàn)一致;排水能力隨著海拔梯度的增加而減小,在27.79~7.86 mm之間。(3)不同海拔梯度類型土壤的初滲率、穩(wěn)滲率和平均滲透率都有較大的差異,初滲率在2.02~20.90 mL·min~(-1)之間,穩(wěn)滲率在0.35~6.20 mL·min~(-1)之間,滲透率和時間的關(guān)系符合冪函數(shù)回歸方程Y=ax~(-b),相關(guān)系數(shù)顯著性相關(guān)水平。
[Abstract]:The soil properties of thicket vegetation types in the upper reaches of Bailong River in Gansu Province were studied. the results showed that: (1) the average soil density, capillary porosity and non-capillary porosity varied greatly with the increase of altitude gradient. The average density of soil is between 0.85 鈮,
本文編號:2484643
[Abstract]:The soil properties of thicket vegetation types in the upper reaches of Bailong River in Gansu Province were studied. the results showed that: (1) the average soil density, capillary porosity and non-capillary porosity varied greatly with the increase of altitude gradient. The average density of soil is between 0.85 鈮,
本文編號:2484643
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