Effect of Slope Gradient on Phosphorus Loss from a Sloping Land of Purple Soil under Simulated Rainfall

Abstract

Slope farmland covers an area of 3,513 × 10 4 m 2 in China, which is a major source of soil and water losses. Soil erosion has been identified as one of the major processes contributing to soil and water quality degradation [1-4]. Recently, the application of excessive fertilizers and manures to agricultural land can increase the level of phosphorus (P) in the purple soil region of Sichuan, China. P is the element primarily responsible for water eutrophication. The loss of P with soil erosion can cause environmental problems due to their effect on water eutrophication [5]. P loss in the purple soil of sloped farmlands has caused much concern [6-9]. Thus, studies should consider P loss caused by runoff and sediments.

A Reliable U-trough Runoff Collection Method for Quantifying the Migration Loads of Nutrients at Different Soil Layers under Natural Rainfall

“…The factors influencing SSR include soil physical and chemical properties [5,6], geobiont [7,8], plant roots [9,10], ground slope [11,12] and roughness [13,14], climate including rainfall [15,16] and freeze-thaw [17], surface coverage [18,19], and farming practices [20,21]. However, such complex and diverse factors make soil nutrients' underground loss difficult to measure directly [22,23]. Therefore, it is Sustainability 2021, 13, 2050. https://doi.org/10.3390/su13042050 https://www.mdpi.com/journal/sustainability vital to develop a reliable method of monitoring soil nutrient migration at different soil layers to control groundwater pollution or non-point source agricultural pollution.…”