六盘山华北落叶松林坡面的土壤水分时间稳定性

发布时间：2018-06-15 14:17

本文选题：华北落叶松坡面 + 土壤含水量　；参考：《水土保持学报》2017年01期

【摘要】：在宁夏六盘山选择华北落叶松林坡面,利用TRIME-PICO土壤水分测定仪,在2015年5—11月对48个测点分12次测定了不同厚度土层(0—20,0—40,0—60cm)的体积含水量的时间动态,并采用累积概率函数、相对偏差及Spearman秩相关系数等方法,分析评价了坡面土壤体积含水量的时间稳定性。结果表明:土壤体积含水量在时间和空间上均存在中等变异,且变异程度随土层加厚而逐渐降低,表现为0—40,0—60cm土层体积含水量的累积概率在干旱和湿润2种极端条件下的变化均小于0—20cm土层。0—20,0—40,0—60cm土层体积含水量的平均相对偏差的变化范围分别为(-43.5%)~(47.9%),(-42.9%)~(49.9%)和(-46.9%)~(40.0%);平均相对偏差的标准差(SDRD)呈现出随土层加厚而逐渐降低的变化趋势,在0—20,0—40,0—60cm土层依次为11.1%,8.3%,7.8%。在整个研究期间,Spearman秩相关系数在不同土层厚度条件下始终保持较高水平(0.7以上),且呈极显著相关,坡面上不同土层的体积含水量具有较高的时间稳定性。基于土壤含水量的时间稳定性特征,确定了研究坡面上不同土层厚度的体积含水量平均值的代表性测点,可利用这些代表性测点的土壤体积含水量测定值估计相应土层厚度的坡面平均值。
[Abstract]:On the slope of Larix gmelinii forest in Liupanshan, Ningxia, the time dynamics of volume water content of different thickness soil layers (0-20 0 ~ 40 ~ 60 cm) were measured by TRIME-PICO soil moisture measurement instrument in 12 times for 48 sites in May and November 2015. The cumulative probability function, relative deviation and Spearman rank correlation coefficient were used to analyze and evaluate the temporal stability of soil volume water content on slope surface. The results showed that there was moderate variation in soil volume water content in time and space, and the degree of variation decreased gradually with the soil layer thickening. The cumulative probability of soil volume water content in 0-40 ~ 60 cm soil layer is smaller than that in 0-20cm soil layer. 0 ~ 20 ~ 0 ~ 40 ~ 40 ~ 60 cm soil layer under two extreme conditions of drought and wetting. The variation range of average relative deviation of volume water content in 0-20 ~ 40 ~ 60 cm soil layer is smaller than that in 0-20cm soil layer. The standard deviation of the mean relative deviation (SDRD) decreased gradually with the thickening of the soil layer, and the standard deviation of the average relative deviation (SDRDs) decreased gradually with the thickening of the soil layer, and 42.9% and 49.9%, respectively, and the standard deviation of the average relative deviation decreased gradually with the thickening of the soil layer, and the standard deviation of the average relative deviation decreased gradually with the thickening of the soil layer. In the 0-20 ~ 400-60 cm soil layer, 11.1and 8.3and 7.8cm in turn. During the whole study period, the Spearman rank correlation coefficient always maintained a higher level than 0.7 under different soil thickness conditions, and showed a significant correlation, and the volume water content of different soil layers on the slope had higher time stability. Based on the temporal stability characteristics of soil water content, the representative measuring points of the average volume water content of different soil layers on the slope are determined. The soil volume water content of these representative sites can be used to estimate the slope average of the corresponding soil thickness.
【作者单位】：中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态环境重点实验室;北京林业大学水土保持学院;
【基金】：国家自然科学基金项目(41471029,41390461,41230852) 科技部科技基础性工作专项(2014FY120700);科技部“十二五”农村领域国家科技计划项目(2012BAD22B030102) 国家林业局宁夏六盘山森林生态站和宁夏回族自治区生态修复与多功能林业综合研究中心项目
【分类号】：S714.2

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