Similarity of the temporal pattern of soil moisture across soil profile in karst catchments of southwestern China
Similarity of the temporal pattern of soil moisture across soil profile in karst catchments of southwestern China
复制标题
中国西南喀斯特流域土壤水分跨剖面土壤水分时间格局的相似性
DOI：
10.1016/j.jhydrol.2017.10.045
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发表时间：
2017-12
影响因子：
6.4
通讯作者：
Wang Kelin
中科院分区：
文献类型：
--
作者：
Li Xuezhang;Xu Xianli;Liu Wen;He Liang;Zhang Rongfei;Xu Chaohao;Wang Kelin
土壤水分剖面动态特性的研究对于土壤水分预报和模型的建立具有重要意义。然而，关于表层和次表层土壤水分之间关系的资料相对不足。本研究的目的是检查的相似性，在整体和特定规模的时间模式的土壤水分剖面。土壤水分测定在5个土壤深度，使用时域反射仪在两个样地超过242天的喀斯特洼地。斯皮尔曼等级相关和小波相干分析被用来确定土壤水分的时间模式的整体和尺度依赖的相似性，分别。结果表明，农田土壤水分高于草地，尤其是10-50 cm土层。农田和草地的地表深度具有较高的变异性。任何两个土壤深度之间的斯皮尔曼等级相关系数是显着的，表明强的深度持久性在整个时间模式的土壤水分。相似性随着深度距离的增加而减小。小波相关分析表明，农田土壤水分时间格局的深度持续性强于草地。土壤深度对土壤水分时间格局相似性的影响大于土地利用，相对湿度和降水量对更大尺度上土壤水分变化的控制作用大于气温。这些尺度上的土壤水分时间模式的特定相似性可以用来指导估计更深的土壤水分和改进采样策略，土壤水分预测具有更高的预测精度。
Knowledge of dynamics of profile soil moisture is of importance for soil moisture prediction and modeling. However, information on the relationships between soil moisture at the surface and subsurface layers is relatively inadequate. The objective of this study was to examine the similarities in the overall and scale specific temporal patterns of soil moisture across soil profile. Soil moisture was measured at five soil depths using time-domain reflectometry in two sampling plots over 242 days in a karst depression. Spearman rank correlation and wavelet coherency analyzes were used to determine overall and scale-dependent similarities of temporal patterns of soil moisture, respectively. Results showed that soil moisture in farmland was higher than grassland especially in 10–50 cm depths. The surface depth had higher variability for both farmland and grassland. Spearman rank correlation coefficients between any two soil depths were significant, indicating strong depth persistence in the overall temporal pattern of soil moisture. The similarity decreased as the distance between depths increased. Wavelet coherency analysis indicated that soil moisture temporal pattern had a higher depth persistence in the farmland than grassland. Soil depth had a larger influence than land uses on the similarity in soil moisture temporal pattern, and the relative humidity and precipitation had larger effect than air temperature controlling the change of soil moisture at larger scales. These scale specific similarity in the temporal pattern of soil moisture can be used to guide estimating deeper soil moisture and to improve sampling strategies for soil moisture prediction with a higher prediction accuracy.
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影响因子：
2.4
作者：
Qiaosheng Shu;Zuo-xin Liu;B. Si
通讯作者：
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影响因子：
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通讯作者：
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