西北旱区葡萄园土壤水分空间分布研究

Spatial Distribution of Soil Moisture in Vineyard in Arid Region of Northwest China

研究于我国西北旱区武威市一葡萄园内进行,根据葡萄行走向按照30m×30m设置网格,共设计60个采样点。测定表层(10～20cm)、葡萄根区(20～80cm)、深层(80～100cm)3个层次土壤水分。采用传统统计与地统计相结合的方法对土壤水分空间分布状况进行分析,结果表明,各层次土壤水分均服从正态分布,具有中等变异强度,并随着深度的增加呈现出先增加后减小的趋势;各层次土壤水分具有较强的空间相关性,其理论变异函数的有效变程分别为117.04、167.92、174.81m;采用克立格插值方法绘制的各层次土壤水分分布图可以为灌溉制度的制定提供参考。并给出了不同置信水平及精度要求下的合理取样数目。

The arid region of Northwest China has become a major wine grape cultivation base,and the soil moisture is important for grape growth and quality.So we need to obtain accurate soil moisture condition for fine irrigation management.The research was carried out at a vineyard in Wuwei City which located at an arid region in Northwest China,and sixty sampling points collected on a 30 m grid.Soil moisture was measured at three depths in soil profile： 10~20 cm for the soil surface,20~80 cm in grape root zone,80~100 cm in deep layer.The data was analyzed with a combination of classical statistics and geological statistic.The research results showed that all layers of soil moisture were normal distribution,and all the layers of soil moisture exhibited moderate spatial variability,in the tendency of increasing first and then decreasing with depth increases;and all soil water was correlated in spatial range,the range of theoretical variation functions of soil moisture correlation distance was 117.04 m,167.92 m and 174.81 m;The soil moisture distribution map which was charted by Kriging interpolating can provide reference for formulating irrigation system;The rational sampling number for soil moisture was given under different believable level and exactitude through the classic statistics analysis.