论文部分内容阅读
通过模拟降雨试验,研究粤北地区不同石漠化程度的灌丛坡地地表径流水中钙离子含量的变化。结果表明,在不同雨强下,不同石漠化灌丛坡地地表径流量、地表径流水钙离子浓度和地表径流水钙离子总量随石漠化程度的加重呈逐渐上升后又降低的倒“U”型趋势;在同一雨强下,潜在、轻度和极重度石漠化坡地径流水钙离子流失量远低于中度和重度石漠化坡地;地表水中的钙离子流失总量和地表径流量、土层厚度、岩石裸露率均有较高的相关性,其中与地表径流量达到显著性相关。
By simulated rainfall experiment, the change of calcium ion in surface runoff water of shrub slope in different rocky desertification degree in northern Guangdong was studied. The results showed that under different rainfall intensities, the surface runoff, surface runoff water and surface runoff calcium in different rocky desertified shrublands increased gradually with the increase of rocky desertification and then decreased, Under the same rainfall intensity, the runoff Ca (superscript 2+) in potential, mild and extremely severe rocky desertification slopes was much lower than that in moderate and severe rocky desertification slopes. The total amount of calcium loss in surface water And surface runoff, soil thickness, rock exposed rate has a high correlation, which is significantly related to surface runoff.