2002—2017年黄河谷地旱地土壤水分变化趋势

运用青海省贵德县气象局观测的2002—2017年旱地土壤水分资料,分析了该地区0～30cm土壤水分变化特征,结果显示：2002—2017年来春季0～30厘米土壤水分呈显著降低趋势,秋季0～30cm土壤水分变化趋势较平稳,春秋季土壤水分年际变化均很明显。春季0～30cm各层土壤水分均呈现极显著的降低趋势,秋季0～10 cm土壤水分随年际呈微弱的增加趋势,10～20、20～30 cm土壤水分随年际的延长呈现微弱的减少趋势,各层土壤水分的幅度较春季大。春季各月0～30 cm土壤水分随年际均呈降低趋势,秋季各月土壤水分的增减趋势不明显。春、秋季气温显著升高,春季降水变化趋势比较平稳,秋季降水量呈不显著增多趋势。

Variation Trend of Arid Farmland Soil Moisture of the Yellow River Valley, 2002-2017

The moisture variation trend of 0-30 cm soil in Guide, Qinghai was analyzed based on the arid farmland soil moisture data of Guide weather bureau from 2002 to 2017. The results showed that the soil moisture of 0-30 cm layer in arid farmland decreased significantly in spring during 2002 to 2017, and that in autumn was stable. The annual change of soil moisture was obvious in spring and autumn, the soil moisture of 0-30 cm in each layer presented a very significant decreasing trend in spring, but in autumn, the soil moisture of 0-10 cm showed a weak interannual increasing trend, the soil moisture of 10-20 and 20-30 cm decreased slightly, and the soil moisture of each layer was larger than that of spring. The soil moisture of 0-30 cm in each spring month had an interannual decreasing trend, but the changing of soil moisture in autumn months was not obvious. The temperature increased significantly in both spring and autumn, the change of precipitation was relatively stable in spring, and had an insignificant increase in autumn.