大青山典型植被类型降雨产流阈值估算及保肥效益计量

The Estimation of Rainfall Runoff Threshold and Measurement of Fertilizer Benefit of Typical Vegetation Types in Daqing Mount

采用大气降雨和人工模拟降雨的方法，对大青山不同植被类型林冠截留量、枯落物及土壤持水量进行了研究，当模拟降雨强度为0．60～0．65mm／min时，不同植被类型降雨产流闽值分别为：乔木林11．018～17．080mm，灌木林11．609—13．353mm，荒草坡7．592～11．336mm；当模拟降雨强度为0．80—0．85mm／min时，不同植被类型降雨产流阚值分别为：乔木林7．274—12．7268mm，灌木林7．943—9．353mm，荒草坡4．328—6．496mm；通过对流失土壤养分的测定，计算出不同降雨强度下油松人工林、白桦次生林、虎榛子灌丛和荒草坡土壤流失价值分别为：61．39—136．37元／hm2、8．24-113．37元／hm2、28．11～59．11元／hm2和93．92—107．61元／hm2。

By the method of the rainfall and artificial simulation of rainfall, this paper investigates the canopy interception and the litter and soil water holding capacity of different types of vegetation in Daqing Mountain. When the simulated rainfall intensity is 0.60 - 0.65 mm/min, the Runoff rainfall intensity of the arbor forest is 11. 018 - 17.080 mm, the Runoff rainfall intensity of the shrub forest is 11. 609 -13. 353 mm, he Runoff rainfall intensity of the barren grassland slope is 7. 592 -11. 336 mm. When the simulated rainfall intensity is 0.80 - 0. 85 mm/min, the Runoff rainfall intensity of the arbor forest is 7. 274 - 12.7268 mm, the Runoff rainfall intensity of the shrub forest is 7. 943- 9. 353 mm, he Runoff rainfall intensity of the barren grassland slope is 4. 328 - 6. 496 mm. Based on the determination of soil nutrients, we calculated the soil loss value of artificial Chinese pine forest, birch forest, Ostryopsis shrub and grass slope under different rainfall intensities. The soil loss value of different vegetation types respectively are 1. 39-136.37 RMB/hm2, 8.24 - 113.37 RMB/hm2, 28.11-59.11 RMB/hm2 and 93.92 - 107.61 RMB/hm2.