黄土高原丘陵区冰草和柳枝稷土壤细沟可蚀性季节动态
发布时间：2019-03-01 11:32
【摘要】：为了评价黄土高原丘陵区退耕还草水土保持效应,本研究以黄土丘陵区冰草(Agropyron cristatum)和柳枝稷(Panicum virgatum)为研究对象,在不同坡度(S=17.36%~42.26%)和流量(Q=1.0~2.5L·s~(-1))条件下,采用变坡试验水槽测定土壤的分离能力,利用线性回归方法,结合土壤侵蚀过程,运用WEPP模型推求土壤细沟可蚀性(Kr),分析了冰草和柳枝稷生育期内土壤Kr的季节变化规律。结果表明,黄土丘陵区冰草生育期内土壤Kr具有显著的季节变化(P0.05),总体呈下降趋势;柳枝稷生育期内土壤Kr无显著季节变化(P0.05)。冰草土壤Kr表现为下降的季节变化,变化范围为0.002 1~0.022 4s·m~(-1);柳枝稷土壤Kr表现为先升高后降低的季节变化,变化范围为0.003 2~0.021 9s·m~(-1)。土壤黏结力、水稳性团聚体和根重密度是影响冰草和柳枝稷生育期内土壤Kr季节变化的主要因素。土壤细沟可蚀性与土壤黏结力、水稳性团聚体及根重密度间呈显著负相关关系。此外,用土壤黏结力和根重密度能够较好地模拟黄土丘陵区冰草和柳枝稷生育期内土壤细沟可蚀性的季节变化。冰草和柳枝稷土壤细沟可蚀性季节变化主要由根系生长和土壤黏结力变化所致。土壤细沟可蚀性与土壤黏结力、水稳性团聚体和根重密度间呈显著负相关关系。用土壤黏结力和根重密度等参数能够较好地模拟冰草和柳枝稷土壤细沟可蚀性的季节变化规律。
[Abstract]:In order to evaluate the effect of soil and water conservation on the soil and water conservation in the hilly area of the Loess Plateau, the study was carried out in the condition of different slope (S = 17.36% ~ 42.26%) and flow (Q = 1.0 ~ 2.5 L 路 s ~ (-1)). The soil separation ability was determined by the variable slope test water tank, and the soil erosion (Kr) was calculated by the WEPP model by using the linear regression method, and the seasonal variation of the soil Kr in the growth period of the ice grass and the willow branch was analyzed. The results showed that there was a significant seasonal change in the soil Kr during the growth period of the ice-grass in the hilly region of the loess region (P0.05), and there was no significant seasonal change in the soil Kr during the growth period of the willow branch (P0.05). The seasonal variation of Kr in the ice-grass soil was in the range of 0.002 1-0.022 4 s 路 m ~ (-1), and the soil Kr in the Liuzhi-grass was the seasonal variation after the increase, and the range of variation was 0.003 2-0.021 9s 路 m ~ (-1). The soil adhesion, the water-stability aggregates and the root-weight density are the main factors that affect the seasonal variation of the soil Kr in the growth period of the ice grass and the willow branch. There was a significant negative correlation between the erodibility of the soil fine trench and the soil adhesion, the aggregate of the water-stability and the density of the root. In addition, the seasonal variation of the erodibility of the soil in the growth period of the ice grass and the willow branch in the loess hilly region can be well simulated by the soil adhesion and the density of the root. The seasonal variation of the erodibility of the fine trench in the soil of the ice grass and the willow branch is mainly caused by the root system growth and the change of the soil adhesion. There was a significant negative correlation between the erodibility of the soil fine trench and the soil adhesion, the aggregate of the water-stability and the density of the root. The seasonal variation of the erodibility of the fine trench in the soil of the ice and the willow branches can be simulated better with the parameters such as the soil adhesion and the density of the root.
【作者单位】： 宝鸡文理学院地理与环境学院;陕西省灾害监测与机理模拟重点实验室;
【基金】：国家自然科学基金项目(41371497、41171423、41601016) 陕西省教育厅重点实验室项目(2010JS072、2009JS071) 宝鸡文理学院重点科研项目(ZK2017039、ZK2017040)
【分类号】：S157
，
本文编号：2432385
[Abstract]:In order to evaluate the effect of soil and water conservation on the soil and water conservation in the hilly area of the Loess Plateau, the study was carried out in the condition of different slope (S = 17.36% ~ 42.26%) and flow (Q = 1.0 ~ 2.5 L 路 s ~ (-1)). The soil separation ability was determined by the variable slope test water tank, and the soil erosion (Kr) was calculated by the WEPP model by using the linear regression method, and the seasonal variation of the soil Kr in the growth period of the ice grass and the willow branch was analyzed. The results showed that there was a significant seasonal change in the soil Kr during the growth period of the ice-grass in the hilly region of the loess region (P0.05), and there was no significant seasonal change in the soil Kr during the growth period of the willow branch (P0.05). The seasonal variation of Kr in the ice-grass soil was in the range of 0.002 1-0.022 4 s 路 m ~ (-1), and the soil Kr in the Liuzhi-grass was the seasonal variation after the increase, and the range of variation was 0.003 2-0.021 9s 路 m ~ (-1). The soil adhesion, the water-stability aggregates and the root-weight density are the main factors that affect the seasonal variation of the soil Kr in the growth period of the ice grass and the willow branch. There was a significant negative correlation between the erodibility of the soil fine trench and the soil adhesion, the aggregate of the water-stability and the density of the root. In addition, the seasonal variation of the erodibility of the soil in the growth period of the ice grass and the willow branch in the loess hilly region can be well simulated by the soil adhesion and the density of the root. The seasonal variation of the erodibility of the fine trench in the soil of the ice grass and the willow branch is mainly caused by the root system growth and the change of the soil adhesion. There was a significant negative correlation between the erodibility of the soil fine trench and the soil adhesion, the aggregate of the water-stability and the density of the root. The seasonal variation of the erodibility of the fine trench in the soil of the ice and the willow branches can be simulated better with the parameters such as the soil adhesion and the density of the root.
【作者单位】： 宝鸡文理学院地理与环境学院;陕西省灾害监测与机理模拟重点实验室;
【基金】：国家自然科学基金项目(41371497、41171423、41601016) 陕西省教育厅重点实验室项目(2010JS072、2009JS071) 宝鸡文理学院重点科研项目(ZK2017039、ZK2017040)
【分类号】：S157
，
本文编号：2432385
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