基于地统计学农田不同土层土壤容重的空间变异特征分析
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摘要
利用烘干法测定玉米地0～5 cm、5～10 cm、10～15 cm、15～20 cm土层土壤容重,运用半方差函数和克立格插值等方法对农田土壤容重空间变异特征随土层深度的变化规律进行研究。结果表明,不同土层土壤容重平均值介于1.23～1.33 g/cm~3,均为弱变异,空间相关范围介于20.40～75.64 m,空间相关程度介于28.89%～73.55%,空间分布图中均存在明显的斑块结构;随土层深度的增加,土壤容重平均值呈先增加后减少的变化趋势,变异程度呈先降低后升高的变化趋势,半方差函数拟合模型由指数模型变为线性模型,空间相关范围先增加后保持不变,空间相关程度未呈现出规律性的变化趋势,土壤容重低值区和高值区的分布数量和位置有所差异。
Based on soil bulk density in 0～5 cm, 5～10 cm, 10～15 cm and 15～20 cm soil layers measured with oven drying method, the changing trend of spatial variability of soil bulk density with increasing soil depth was studied using semi-variance and Kriging interpolation methods. The results showed that, for different soil layers, the average value of soil bulk density ranged from 1.23 g/cm~3 to 1.33 g/cm~3, its degree of variation was weak, its spatial correlation range was between 20.40 m and 75.64 m, its spatial correlation degree changed from 28.89% to 73.55%, and there were obvious patch structure in its spatial distribution. As soil depth increased, the average value of soil bulk density firstly increased and then decreased, its degree of variation increased after fell first, its fitted model of semi-variance changed from exponential model to linear model,its spatial correlation range increased at first and remained unchanged later, its spatial correlation degree did not present a regular changing trend, and there were differences in number and location of its high and low value area.
Based on soil bulk density in 0～5 cm, 5～10 cm, 10～15 cm and 15～20 cm soil layers measured with oven drying method, the changing trend of spatial variability of soil bulk density with increasing soil depth was studied using semi-variance and Kriging interpolation methods. The results showed that, for different soil layers, the average value of soil bulk density ranged from 1.23 g/cm~3 to 1.33 g/cm~3, its degree of variation was weak, its spatial correlation range was between 20.40 m and 75.64 m, its spatial correlation degree changed from 28.89% to 73.55%, and there were obvious patch structure in its spatial distribution. As soil depth increased, the average value of soil bulk density firstly increased and then decreased, its degree of variation increased after fell first, its fitted model of semi-variance changed from exponential model to linear model,its spatial correlation range increased at first and remained unchanged later, its spatial correlation degree did not present a regular changing trend, and there were differences in number and location of its high and low value area.
引文
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[2]耿韧,张光辉,李振炜,等.黄土丘陵区浅沟表层土壤容重的空间变异特征[J].水土保持学报,2014,28(4):257-262.
[3]于冬雪,贾小旭,黄来明,等.黄土区不同土层土壤容重空间变异与模拟[J].土壤学报,2019,56(1):55-64.
[4]郑纪勇,邵明安,张兴昌.黄土区坡面表层土壤容重和饱和导水率空间变异特征[J].水土保持学报,2004,18(3):53-56.
[5]徐翠兰,侯淑楠,姚紫东,等.南方农田土壤容重空间变异性及其尺度效应[J].排灌机械工程学报,2017,35(5):424-429.
[6]李晓晓,刘京,赵世伟,等.西北干旱区县域农田表层土壤容重空间变异性特征[J].水土保持学报,2013,27(4):148-151.
[7]冯强,段宝玲,姜硕.小流域尺度土壤容重及其影响因素的空间变异[J].山西农业大学学报(自然科学版),2016,36(1):39-45.
[8]易小波,邵明安,赵春雷,等.黄土高原南北样带不同土层土壤容重变异分析与模拟[J].农业机械学报,2017,48(4):198-205.
[9]孙国军,李卫红,朱成刚,等.新疆伊犁河谷表层土壤容重的空间变异性分析[J].资源科学,2016,38(7):1222-1228.
[10]雷志栋,杨诗秀,谢森传.土壤水动力学[M].北京:清华大学出版社,1988.
[11] CAMBARDELLA C A,MOORMAN T B,NOVAKJ M,et al. Fieldscale variability of soil properties in central lowa soils[J].Soil Sci Soc Am J,1994,58:1501-1511.
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