Abstract
Soil nutrient loss not only reduces soil productivity, but also causes non-point source pollution and accelerates the eutrophication of surface water. In order to understand the effects of slope lengths (2m, 4m), vegetation coverage ratios (15%, 30%, 45%, 60%, 90%) on the mechanisms of soil nutrient loss, the research studied the simulated rainfall experiment with the slope gradient of 20°, the rainfall intensity of 2.0 mm/min and the time of producing runoff for about 30 min. The experimental results showed that the runoff coefficient is mainly affected by vegetation coverage ratio.
Highlights
Nitrogen (N) and phosphorus (P) are the required nutrients for the sustainable development of agroecosystem, and identified as the main sources of non-point pollution because of their losses caused by surface runoff (Domburg P.,2000)
The runoff coefficient was mainly affected by slope lengths, vegetation coverage ratios, while runoff coefficient mainly affected sediment yield but their extremely significant level was less than 0.01
There are many literatures that pointed out that increasing vegetation coverage ratio could protect soil surface layer from the direct impact of raindrops and to some extent reduce water loss and soil erosion (Smets et al.,2008).Vegetation cover could mainly hold up a certain amount of the rainwater to soil surface layer and reduce the kinetic energy of raindrops
Summary
Nitrogen (N) and phosphorus (P) are the required nutrients for the sustainable development of agroecosystem, and identified as the main sources of non-point pollution because of their losses caused by surface runoff (Domburg P.,2000). 3.1 Different slope lengths and different vegetation ratios on the characteristics of runoff and sediment
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