不同覆盖措施对褐土养分流失的影响

发布时间：2018-06-13 09:53

本文选题：土壤侵蚀 + 土壤养分流失　；参考：《水土保持学报》2017年03期

【摘要】：为探究不同覆盖措施对养分流失及其粒径分布的影响,采用人工模拟降雨试验的方法,模拟了不同雨强(30,60mm/h)和不同覆盖物(枯落物、砾石)下,不同覆盖度对褐土坡面养分流失的影响,并对侵蚀土壤的粒径分布、养分流失浓度进行了分析。研究表明:(1)不同覆盖措施均能有效减少土壤流失,250g/m~2的枯落物和盖度为50%的砾石覆盖可减少91%~98%和68%~91%的土壤流失。(2)褐土坡面下,被侵蚀土壤中有机质、速效氮、速效磷的浓度基本不随覆盖条件的变化而变化,而速效钾的浓度随坡面覆盖度的增加可增至裸地对照组的144%~325%。(3)土壤中养分流失随坡面覆盖度增加而减少,250g/m~2的枯落物和盖度为50%的砾石覆盖可减少64%~96%和43.29%~94.39%的养分流失。(4)被侵蚀土壤的粒径显著小于侵蚀前土壤,并且侵蚀模数越大,被侵蚀土壤的粒径组成越接近于原状土。
[Abstract]:In order to investigate the effects of different mulching measures on nutrient loss and particle size distribution, simulated rainfall experiments were conducted under different rainfall intensities (3060mm / h) and mulches (litter and gravel). The effects of different coverage on nutrient loss on the slope surface of brown soil were studied. The particle size distribution and nutrient loss concentration of eroded soil were analyzed. The results show that different mulching measures can effectively reduce soil loss of 250 g / mm2 of litter and 50% coverage of gravel, which can reduce 91% 98% and 68% soil loss. 2) under the slope of brown soil, organic matter and available nitrogen in eroded soil can be reduced. The concentration of available phosphorus basically did not change with the change of mulching condition. However, the concentration of available potassium increased with the increase of slope coverage, and increased to 1444% of the control group.) the nutrient loss in the soil decreased with the increase of slope coverage, and the litter of 250 g / mm2 and the gravel cover with 50% coverage reduced the nutrient loss by 64% 96% and 43.2994.39% respectively. 4) the particle size of the eroded soil is significantly smaller than that of the pre-erosion soil. And the larger the erosion modulus, the closer the particle size composition of the eroded soil is to the undisturbed soil.
【作者单位】：北京林业大学水土保持学院;
【基金】：国家重点研发计划项目(2016YFC0500802) 国家自然科学基金项目(41401013) 科技创新服务能力建设-协同创新中心-林果业生态环境功能提升协同创新中心(2011协同创新中心,市级,PXM2016_014207_000038)
【分类号】：S157

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