| 贵州喀斯特人工草地土壤水分空间异质性对放牧强度的响应 |
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| 引用本文： | 王普昶,王志伟,丁磊磊,莫本田,舒健虹,李世歌.贵州喀斯特人工草地土壤水分空间异质性对放牧强度的响应[J].水土保持学报,2016(3). |
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| 作者姓名： | 王普昶 王志伟 丁磊磊 莫本田 舒健虹 李世歌 |
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| 作者单位： | 贵州省草业研究所,贵阳,550006 |
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| 基金项目： | 国家重点基础研究“973”计划(2014CB138706),贵州省优秀青年人才专项(黔科合人字[2015]02号),贵州省体制改革项目(黔科合体Z字[2012]4005号) |
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| 摘 要： | 采用地统计学方法研究贵州南部人工草地不同放牧强度(零牧、中牧和重牧)下浅层土壤剖面(0—10,10—20,20—30cm)水分的空间异质性及其影响因素。结果表明:喀斯特人工草地土壤水分的平均值与变异系数均呈现出明显的放牧强度变化与剖面变化规律;在不同放牧强度下,0—10cm和10—20cm土壤剖面含水量均表现为NGHGMG,20—30cm土层土壤含水量为NGMGHG,变异系数均呈中等变异(10%CV100%),平均含水量处于中等水平时土壤水分变异性较高;土壤水分的Moran’s I自相关分析表明,不同放牧强度下不同土层草地土壤水分均具有较强的空间自相关性,且空间自相关性主要受放牧影响;土壤水分半方差分析表明,不同放牧强度下不同土层草地土壤水分空间分布特征模型为指数模型、球状模型或高斯模型,表明其均为聚集分布;不同放牧强度C/(C0+C)值在0.500~0.817之间,表明土壤水分表现出中等或很强的空间自相关性;不同放牧强度土壤水分变程在2.77~15.61m范围内变化(零牧,2.53~12.82m;中牧,2.77~15.61m;重牧,14.03~18.79m),说明影响土壤水分的生态过程随放牧强度变化在不同尺度上起作用;Kriging maps直观地反映和验证了草地土壤水分的空间变化规律,与Moran’s I和半方差函数分析的结果相吻合。综合分析发现,在小尺度内,重牧是地势平坦的喀斯特人工草地表层土壤水分空间变异的主要影响因素。
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| 关 键 词： | 喀斯特 草地 土壤水分 空间变异性 放牧 |
| 收稿时间： | 2016/1/7 0:00:00 |
| 修稿时间： | 2016/3/18 0:00:00 |
The response of small scale spatial variability of pasture soil moisture to#$NBSgrazing intensity in karst grassland of Guizhou |
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| WANG Puchang,MO Bentian,and.The response of small scale spatial variability of pasture soil moisture to#$NBSgrazing intensity in karst grassland of Guizhou[J].Journal of Soil and Water Conservation,2016(3). |
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| Authors: | WANG Puchang MO Bentian and |
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| Institution: | Guizhou Institute of Prataculture,,,Guizhou Institute of Prataculture,, |
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| Abstract: | Land use has a significant impact on spatial soil moisture patterns, particularly in sensitive and poorly managed regions such as karst grassland of Guizhou. This study identified the factors that control soil moisture patterns under different grazing intensities in the pasture grazing system of Guizhou. Three different levels of goat grazing intensity were sampled for various soil moistures including no grazing, moderate grazing and heavy grazing. The data were analyzed using correlation and geostatistical analysis. The results indicated that obviously trend were showed on the average and spatial heterogeneity of the pasture soil moisture as the changing of grazing intensity and soil profile. Under different grazing intensity, soil moisture content of 0-10 and 10-20 cm layers were for NG > HG > MG, soil moisture content of 20-30 cm were for MG > NG > HG, coefficient of variation were moderate variation (10% < CV < 100%), high soil moisture variation was during medium level of the average water content. Moran"s I autocorrelation analysis show that soil moisture had strong autocorrelation, and the correlation was mainly affected by grazing. Semi-variance analysis showed that spatial distribution characteristics of soil moisture was gathering distribution. The C/(C0 C) values of soil moisture were varied b during 0.500 to 0.817, which suggested that soil moisture had moderate or strong spatial correlation. The variation region of soil moisture under different grazing intensity were from 2.77 to 15.61 m, which suggested that the ecological process affected by soil moisture was altered under different grazing intensity. The Kriging map further showed a great spatial heterogeneity of the soil moisture content. Moreover, the soil moisture spatial variability in this region mostly contributed to grazing intensity. |
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| Keywords: | Karst pasture soil moisture spatial variability grazing |
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