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首页> 外文期刊>土壤圈（英文版） >Effects of Accelerated Soil Erosion on Soil Nutrient Loss After Deforestation on the Loess Plateau
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Effects of Accelerated Soil Erosion on Soil Nutrient Loss After Deforestation on the Loess Plateau

机译：黄土高原毁林后加速土壤侵蚀对土壤养分流失的影响

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摘要

Soil erosion and nutrient losses on newly-deforested lands in the Ziwuling Region on the Loess Plateau of China were monitored to quantitatively evaluate the effects of accelerated soil erosion, caused by deforestation, on organic matter,nitrogen and phosphorus losses. Eight natural runoff plots were established on the loessial hill slopes representing different erosion patterns of dominant erosion processes including sheet, rill and shallow gully (similar to ephemeral gully). Sediment samples were collected after each erosive rainfall event. Results showed that soil nutrients losses increased with an increase of erosion intensity. Linear relations between the losses of organic matter, total N, NH4-N, and available P and erosion intensity were found. Nutrient content per unit amount of eroded sediment decreased from the sheet to the shallow gully erosion zones, whereas total nutrient loss increased. Compared with topsoil, nutrients in eroded sediment were enriched,especially available P and NH4-N. The intensity of soil nutrient losses was also closely related to soil erosion intensity and pattern with the most severe soil erosion and nutrient loss occurring in the shallow gully channels on loessial hill slopes.These research findings will help to improve the understanding of the relation between accelerated erosion process after deforestation and soil quality degradation and to design better eco-environmental rehabilitation schemes for the Loess Plateau.
机译：监测了黄土高原子午岭地​​区新伐森林土地的土壤侵蚀和养分流失，定量评估了森林砍伐造成的加速土壤侵蚀对有机质，氮和磷流失的影响。在黄土山坡上建立了八个自然径流图，代表了主要侵蚀过程的不同侵蚀模式，包括片状，小溪和浅沟（类似于短暂沟）。每次侵蚀性降雨事件后都收集沉积物样本。结果表明，土壤养分流失随侵蚀强度的增加而增加。发现了有机质损失，总氮，NH4-N，有效磷与侵蚀强度之间的线性关系。从表层到浅沟侵蚀区，每单位侵蚀沉积物的养分含量降低，而总养分流失却增加。与表土相比，侵蚀沉积物中的养分含量较高，尤其是磷和氨氮。土壤养分流失的强度与土壤侵蚀强度和分布方式也密切相关，其中最严重的土壤侵蚀和养分流失发生在黄土丘陵坡道的浅沟中。毁林和土壤质量退化后的侵蚀过程，并为黄土高原设计更好的生态环境恢复计划。

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