生物质炭对旱作农田土壤持水特性的影响

发布时间：2018-08-17 08:47

【摘要】：为确定添加生物质炭对旱作农田土壤持水特性的影响,在隆中黄土高原典型旱作农田区设置相关定位试验,对不同生物质炭输入水平的土壤容重、土壤孔隙度、土壤水分常数及土壤水分特征曲线进行测定。结果表明,生物质炭的添加能够减小土壤容重,增加土壤孔隙度。随着生物质炭输入水平的增加,土壤容重的减小及土壤孔隙度的增加幅度加大。生物质炭达到50t/hm~2时土壤结构变化最为明显,0—5,5—10,10—30cm土层中土壤容重相比对照分别减小7.01%,9.91%,16.60%,土壤毛管孔隙度分别增加19.47%,21.02%,29.94%;并且生物质炭的施入可以增加土壤饱和含水量、土壤田间持水量、土壤有效水分含量。随着生物质炭输入水平的不断加大,各水分常数呈现出上升趋势,但当生物质炭输入水平达到40t/hm~2后涨幅空间开始减小。说明生物质炭的添加能够提高旱作农田的持水性能,但输入水平达到40t/hm~2后,土壤持水性能趋于稳定。
[Abstract]:In order to determine the effect of biomass carbon addition on the soil water retention characteristics of dryland farmland, the soil bulk density and soil porosity of different biomass carbon input levels were tested in the typical dryland farmland area of the Loess Plateau in the middle of the Loess Plateau. Soil moisture constant and soil moisture characteristic curve were measured. The results showed that the addition of biomass carbon could reduce soil bulk density and increase soil porosity. With the increase of biomass carbon input level, soil bulk density decreased and soil porosity increased. The soil structure of biomass carbon reached 50 t / hm ~ 2. The soil bulk density in 0-55-1010 ~ (-30) cm soil layer decreased 7.01% 9.91 ~ (-1) and 16.60% respectively, and the porosity of soil capillary increased 19.47% ~ 21.02% (29.94) respectively, and the application of biomass charcoal increased the saturated water content of soil. Soil field water holding capacity, soil available moisture content. With the increasing of biomass carbon input level, the water constants showed an upward trend, but when the biomass carbon input level reached 40t/hm~2, the increase space began to decrease. The results showed that the addition of biomass carbon could improve the water holding capacity of dryland farmland, but when the input level reached 40t/hm~2, the water holding capacity of soil tended to be stable.
【作者单位】：甘肃农业大学资源与环境学院;农业部环境保护科研监测所;
【基金】：国家自然科学基金项目(31571594,31160269) 国家“十二五”循环农业科技工程项目(2012BAD14B03) 甘肃省自然科学基金项目(145RJZA106)
【分类号】：S152.7

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