放牧强度对内蒙古典型草原土壤净氮矿化的影响
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摘要
为了研究放牧对内蒙古典型草原土壤氮矿化的影响,在平地连续放牧(平地传统系统)、平地放牧-打草交替利用(平地混合系统)、坡地连续放牧(坡地传统系统)和坡地放牧-打草交替利用(坡地混合系统)4种处理样地中,分别设置7个放牧强度,包括对照0只羊/hm~2、轻度放牧1.5只羊/hm~2和3.0只羊/hm~2、中度放牧4.5只羊/hm~2和6.0只羊/hm~2以及重度放牧7.5只羊/hm~2和9.0只羊/hm~2。于2009-2010年采用野外随机取样与室内培养相结合的方法,分析了不同放牧强度下的土壤基本理化性状和土壤氮矿化动态,比较了不同地形和利用方式的累积净氮矿化量的差异,同时结合动力学模型的应用,得出土壤氮矿化潜力(N0)和土壤氮矿化速率常数(k)。结果表明:
在不同系统中,土壤有机质和土壤全氮在轻度放牧时较大,土壤pH值、容重和全磷无变化
土壤累积净氮矿化量整体表现为轻度和中度放牧高于重度放牧,坡地高于平地,传统系统高于混合系统的趋势。
N0表现出轻度和中度放牧高于重度放牧,坡地高于平地,传统系统高于混合系统的趋势。
k值在平地中,在重度放牧时较大;而在坡地中,在轻度和中度放牧时较大。
To study the effect of grazing on nitrogen mineralization in the typical steppe of Inner Mongolia, soils were sampled random from traditional system of flat, mixed system of flat site, traditional system of slop and mixed system of slope respectively with different grazing intensities, including control sample, light grazing 1.5 sheep/hm~2 and 3.0sheep/hm~2, moderate grazing 4.5 sheep/hm~2 and 6.0 sheep /hm~2, heavy grazing 7.5 sheep/hm~2 and 9.0sheep/hm~2. Dynamics of soil net nitrogen mineralization and physical and chemical character were analyzed respectively with different grazing intensities, of soils were measured, and the diversity of the accumulated net nitrogen mineralization were compared respectively with different topography and grazing intensities, and nitrogen mineralization potential(N0) and nitrogen mineralization rate constant (k) were calculated with application of model based on sampled random and cultured in door during 2009 to 2010. The main results were as follows:
In different systems, the soil organic and the soil total nitrogen were higher in light grazing. The soil pH, soil bulk density and soil total phosphorus had no change.
The soil accumulated net nitrogen mineralization were higher in light grazing and moderate grazing than heavy grazing and were higher in the slope sites than the flat sites, and were higher in the tradition system than the mixed system.
N0 were higher in light grazing and moderate grazing than heavy grazing and were higher in the slope than the flat sites, and were higher in the traditional system than the mixed system.
k in the flat sites were higher in heavy grazing, in the slope sites were higher in moderate and light grazing.
在不同系统中,土壤有机质和土壤全氮在轻度放牧时较大,土壤pH值、容重和全磷无变化
土壤累积净氮矿化量整体表现为轻度和中度放牧高于重度放牧,坡地高于平地,传统系统高于混合系统的趋势。
N0表现出轻度和中度放牧高于重度放牧,坡地高于平地,传统系统高于混合系统的趋势。
k值在平地中,在重度放牧时较大;而在坡地中,在轻度和中度放牧时较大。
To study the effect of grazing on nitrogen mineralization in the typical steppe of Inner Mongolia, soils were sampled random from traditional system of flat, mixed system of flat site, traditional system of slop and mixed system of slope respectively with different grazing intensities, including control sample, light grazing 1.5 sheep/hm~2 and 3.0sheep/hm~2, moderate grazing 4.5 sheep/hm~2 and 6.0 sheep /hm~2, heavy grazing 7.5 sheep/hm~2 and 9.0sheep/hm~2. Dynamics of soil net nitrogen mineralization and physical and chemical character were analyzed respectively with different grazing intensities, of soils were measured, and the diversity of the accumulated net nitrogen mineralization were compared respectively with different topography and grazing intensities, and nitrogen mineralization potential(N0) and nitrogen mineralization rate constant (k) were calculated with application of model based on sampled random and cultured in door during 2009 to 2010. The main results were as follows:
In different systems, the soil organic and the soil total nitrogen were higher in light grazing. The soil pH, soil bulk density and soil total phosphorus had no change.
The soil accumulated net nitrogen mineralization were higher in light grazing and moderate grazing than heavy grazing and were higher in the slope sites than the flat sites, and were higher in the tradition system than the mixed system.
N0 were higher in light grazing and moderate grazing than heavy grazing and were higher in the slope than the flat sites, and were higher in the traditional system than the mixed system.
k in the flat sites were higher in heavy grazing, in the slope sites were higher in moderate and light grazing.
引文
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