区域土壤水分监测点布设方式探讨

Sampling Strategy of Soil Water in Region

试验在面积为32 km2的封丘潘店乡进行,共布设39个测点,采用烘干法测定土壤含水率来确定合理监测点,通过19次土壤水吸力的监测数据分析得到时间稳定点,并与传统均匀布点进行比较。结果表明,采用时间稳定点作为土壤水吸力的监测点,无论对于研究区平均土壤水吸力值的表征,还是对于其它未布设监测点区域土壤水吸力状况的预测,误差均小于传统的均匀布点方式。为今后墒情监测网的布设提供了一定的参考依据。

The experiment was employed at Pandian village in Henan province, which the area was 32 km^2. The rational number of soil moisture monitoring was determined by measuring soil water content. Soil water tension was measured 19 times from March 15, 2004 to May 30, 2004. Temporal stability of this property were valuated, and obtained the time-stable locations. Compared with traditional grid sampling scheme, the prediction errors by time-stable locations as soil matric potential monitoring sites were obviously smaller in this region. So we must elicit soil moisture monitoring sites based on the results obtained from long term experiments.