| 放牧对土壤碳、氮含量空间变异的影响 |
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| 引用本文： | 红梅,余娜,赵宏儒,胡吉亚,韩国栋.放牧对土壤碳、氮含量空间变异的影响[J].草业科学,2013,30(4):521-527. |
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| 作者姓名： | 红梅 余娜 赵宏儒 胡吉亚 韩国栋 |
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| 作者单位： | 内蒙古农业大学,内蒙古呼和浩特,010018;包头市土肥站,内蒙古包头,014010 |
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| 基金项目： | 教育部科学技术研究重点项目 |
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| 摘 要： | 本研究检测了不同放牧强度下荒漠草原淡栗钙土的碳、氮含量，应用地统计学方法分析放牧强度对土壤碳、氮空间变异的影响。结果表明，土壤碳、氮均属中等变异程度。土壤碳、氮含量随放牧强度的加大而呈现减少的趋势。未放牧、中度放牧以及重度放牧的土壤碳、氮的空间变异主要是由区域因素引起的，空间变异大；而轻度放牧土壤碳、氮的空间变异是区域因素和放牧等随机性因素共同作用的结果，属中等程度的空间相关性。土壤碳、氮的变异总体表现为未放牧>轻度放牧>中度放牧>重度放牧。中度放牧和重度放牧后土壤碳、氮低含量斑块面积随着年度递增而增加。内蒙古四子旗短花针茅（Stipa breviflora）荒漠草原适合轻度放牧。
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| 关 键 词： | 放牧 淡栗钙土 碳氮 空间变异 |
Effects of grazing intensity on spatial variation of organic carbon and total nitrogen contents of soil |
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| HONG Mei,YU Na,ZHAO Hong ru,HU Ji ya,HAN Guo dong.Effects of grazing intensity on spatial variation of organic carbon and total nitrogen contents of soil[J].Pratacultural Science,2013,30(4):521-527. |
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| Authors: | HONG Mei YU Na ZHAO Hong ru HU Ji ya HAN Guo dong |
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| Abstract: | The objective of present study was to determine soil total carbon (C) and nitrogen (N) contents under different grazing densities and analyze the effects of grazing density on spatial variation of soil C and N contents in light chestnut soil by geostatistics. The results indicated that soil C and N contents varied in a moderate grazing degree. With the increasing of grazing intensity, soil C and N contents decreased. Regional factors caused a large spatial variation in soil C and N contents under (none grazing) control, moderate grazing density and heavy grazing density. However, the spatial variation of soil C and N contents under light grazing density was mainly due to interaction of regional factors and random faltor of grazing, which belonged to moderate spatial correlations. Generally, the ranking of variation of soil C and N contents was control>light grazing>moderate grazing>heavy grazing. The patch areas with low soil C and N contents increased in the regions of moderate grazing and heavy grazing year by year. Thus, it is suitable to conduct a light grazing in this area. |
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| Keywords: | grazing light chestnut soil carbon and total nitrogen spatial variation |
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