荒漠化地区土壤水分时空格局及其动态规律研究

Research on Temporal and Spatial Patterns and Dynamic Laws of Soil Water Content in Desert Area

本文应用长期定位研究方法对甘肃民勤荒漠化地区土壤水分时空格局及其动态规律进行了研究。研究结果表明 :(1)荒漠化地区红柳群落与白刺群落土壤水分年际变化不明显 ,流动沙丘年际差异较大 ,最高达 2 5 38% ;(2 )根据土壤水分季节变化特点 ,划分为土壤水分积累期、土壤水分消耗期与土壤水分稳定期 ;(3)土壤水分含量垂直变化规律是由表层到深层依次递增 ,受植被、气象、人为等外界因素影响 ,各群落土壤水分垂直变化范围差异很大 ;(4)不同坡位土壤水分差异很大 ,一般下坡位土壤含水量明显高于上坡位与中坡位土壤含水量 ,前者约是后两者的 2倍 ,最高达到 15 4 0 8%。

Based on long term and position research, the temporal and spatial patterns and dynamic laws of soil water content in Min qin desert area were studied Some results are as follows: (1)The change of soil water content in different years is not obviously in Nitraria sibirica community and Tamarix ramosissima community, but it is great in Shifting sand dune, the maximum is 2 538%; (2)The season dynamic can be divided into three stages: accumulating, consuming and stable; (3)The vertical change of soil water content distribution is obviously, i e, decrease with the depth; (4)Compared with the bottom of slope and middle slope,the top of slope has higher soil water content, the maximum is 15 408%