| 栗钙土硬度的协变性与空间秩序稳定性 |
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| 引用本文： | 陈有君.栗钙土硬度的协变性与空间秩序稳定性[J].内蒙古农业大学学报(自然科学版),2006,27(1):27-34. |
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| 作者姓名： | 陈有君 |
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| 作者单位： | 内蒙古农业大学生物工程学院,呼和浩特,010018 |
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| 基金项目： | 中国科学院知识创新工程项目 |
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| 摘 要： | 土壤的时空变异是土壤特性的测定及建模过程中需要考虑的土壤性质。为了探明栗钙土硬度的空间分布类型及其变异规律,我们用日本藤原制作所产土壤表面硬度计测定了蒙古高原上草地典型栗钙土、暗栗钙土及沙质栗钙土的表层土壤硬度,比较研究了围封禁牧20多年硬度基本处于原始状态下的土壤,与持续过度放牧干扰后硬度增加了2~3倍的土壤和曾经过度放牧、现在禁牧后硬度下降的土壤的硬度及其变异特性。结果表明:栗钙土的土壤硬度的标准差与其平均值之间具有极显著的正相关关系;尽管干扰变化后土壤的硬度发生了很大的变化,但土壤硬度的变异系数却变化很小(<0.5倍),土壤硬度发生变化后,土壤硬度的极值、中值、极差和标准差都变化了相同的比例。无论高硬度土壤还是低硬度土壤,其空间不同样点上的测定值的统计分布均服从正态分布。自相关分析表明,高硬度与低硬度典型栗钙土沿南北方向的空间自相关距均为2.3m左右,高硬度和中硬度沙质栗钙土的自相关距分别是1和2m左右。其它各样地在大于1m的几米范围内没有明显的相关距。这表明外界均匀干扰引起的土壤硬度的变化,对土壤硬度的空间分布类型没有明显的影响。根据方差和平均值的定律推断,(1)在受到放牧干扰后,土壤硬度的标准差与平均值变化了相近甚至相同的倍数;(2)如果两点间的土壤受到相同强度的干扰,这两点间土壤硬度的差值将与两点间硬度的平均值变化相同的倍数;(3)土壤硬度可能发生倍乘变化,即一定条件下,一定强度的干扰将会使土壤硬度变化一定的比例;(4)空间不同位点上的土壤硬度具有协比变化的特性。这些均是土壤性质秩序稳定性的决定条件。
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| 关 键 词： | 土壤硬度 倍乘变化 协比特性 栗钙土 |
| 文章编号： | 1009-3575(2006)01-0027-08 |
| 收稿时间： | 2005-12-30 |
| 修稿时间： | 2005年12月30 |
THE RANK STABILITY AND RATIO VARIATION OF THE PENETRATION RESISTANCE OF CHESTNUT SOILS |
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| CHEN You-Jun.THE RANK STABILITY AND RATIO VARIATION OF THE PENETRATION RESISTANCE OF CHESTNUT SOILS[J].Journal of Inner Mongolia Agricultural University(Natural Science Edition),2006,27(1):27-34. |
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| Authors: | CHEN You-Jun |
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| Institution: | College of Bioengineering, Inner Mongolia Agriculture University, Huhhot 010018, China |
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| Abstract: | The heterogeneous nature of soil is an important consideration when measuring or predicting soil properties. The purpose of this study was to describe the spatial pattern and its varying rule of penetration resistance (PR). The PR was measured for fields with and without intense grazing on Chestnut soils (CS) on Inner Mongolia Plateau for Typic Chestnut Soil (TCS), Dark Chestnut Soil (DCS), and Sandy Chestnut Soil (SCS) by soil hardness tester of Fuji Wara. Also PR was measured on DCS and SCS fields for post grazing. The varying rule of soil PR was inferred by the law of statistics based on the relation of Standard Deviation (SD) and the Mean (M) of PR and the relationship of PR of different fields. There were large differences between the average PR of different fields of a soil but small variations in coefficient of variation (CV). The PR of a field has changed for the change of grazed situation, its extreme value, middle value, the distributed range of the measured PR and SD are all changed the same ratio as that of M. Pooled across fields, the within-field Ms were extremely significantly correlated with SD. The autocorrelation length for both conventional and compacted TCS was around 2.3 m in the north-south direction, and was around 1 m for conventional SCS and 2 m for compacted SCS. There was no significant autocorrelation length for the other fields. And the distribution pattern of PR is normal distribution and it did not change with the PR. Based on these results and the law of expected value and variance we can concluded that the SD has changed almost the same time as that of M and the PR difference between two points will vary the same ratio as their M after being disturbed. This was caused by the features of ratio variation and co-ratio variation of PR of different point. The co-ratio variation is the determining factor for the rank (order) stability and spatial distribution pattern. |
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| Keywords: | Co-ratio nature Rank stability Chestnut soil Ratio variation Hardness |
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