Temporal stability analysis of surface soil water content on two karst hillslopes in southwest China
Temporal stability analysis of surface soil water content on two karst hillslopes in southwest China
复制标题
西南两处岩溶山坡表层土壤含水量时空稳定性分析
DOI：
10.1007/s11356-016-7686-x
复制
发表时间：
2016-09
影响因子：
5.8
通讯作者：
Wang, Kelin
中科院分区：
文献类型：
--
作者：
Wang, Sheng;Chen, Hong Song;Fu, Zhiyong;Wang, Kelin
了解土壤水分在坡面尺度上的时间变异性，对于指导中国西南喀斯特地区的恢复策略和优化水资源管理具有重要意义。本研究旨在将时间稳定性分析应用于高尺度的点尺度量测，以代表两个典型岩溶山坡的平均面状SWC。2011年4月至2012年10月，对位于两个山坡上的两个90m×120m地块采用10m×10m网格采样方案，在259个采样点上进行了11-12次深度为0-16 cm的SWC测量。还测量了这些地点的土壤质地、容重(BD)、饱和导水率(Ks)、有机碳(SOC)、岩屑含量(RFC)和场地高程(SE)。结果表明，灌木覆盖度较高的坡面比草灌混交的坡面湿润；这种差异与土壤质地、土壤透水性和地形的差异有关。通过与Spearman相关系数(Rs)、平均相对偏差标准差(SDRD)和平均绝对偏差(MABE)的比较，我们推断，在两个山坡上，湿条件下的SWC具有比干燥条件下更高的时间稳定性。根据时间稳定性指数(ITS)的值，结合平均相对差值(MRD)和SDRD，确定这两个位置代表两个坡面上的平均SWC。此外，这些地点捕捉到了平均SWC的变化(NSCE=0.69和0.65，RMSE=1.96和1.96%)。论证了利用SWC的时间稳定性来求取中国西南岩溶坡面的平均SWC的可行性。间接方法通过考虑时间稳定位置的平均值和测量值之间的偏差来估计平均SWC，预测平均SWC(NSCE=0.86和0.76，RMSE=1.29和1.63%)比直接方法(直接在时间稳定位置直接测量的平均SWC)更准确，因为它通过引入恒定偏移量(MRD)来消除偏差。当MRD和SDRD都不能达到5%的允许偏差时，我们建议使用间接法来获取SWC值的平均值。此外，我们还发现土壤质地、RFC和海拔高度影响着灌丛坡面上的SWC格局。这些结果可望为岩溶坡面土壤水分动态监测，特别是恢复利用提供参考。
Knowledge of the temporal variability of soil water content (SWC) at the hillslope scale is essential for guiding rehabilitation strategies and for optimizing water resource management in the karst region of southwest China. This study aimed to use temporal stability analysis to upscale point-scale measurements to represent mean areal SWC on two typical karst hillslopes. Based on a grid sampling scheme (10 m × 10 m) applied to two 90 m × 120 m plots located on two hillslops, the SWC at a depth of 0–16 cm was measured 11–12 times across 259 sampling points, using time domain reflectometry (TDR) from April 2011 to October 2012. Soil texture, bulk density (BD), saturated hydraulic conductivity (Ks), organic carbon (SOC), rock fragment content (RFC), and site elevation (SE) were also measured at these locations. Results showed the hillslope with more shrub cover was wetter than the hillslope with mixed grass-shrub cover. This difference was related to the differences in soil texture, soil hydraulic permeability, and topography. Through a comparison of values obtained with the Spearman correlation coefficient (rs), standard deviation of mean relative difference (SDRD), and mean absolute bias error (MABE), we inferred that there is a higher degree of temporal stability for SWC in wet conditions than in drier conditions on the two hillslopes. Based on the values of the index of temporal stability (ITS), which combine the mean relative difference (MRD) and SDRD, the two locations were determined to be representative of mean SWC on both hillslopes. Moreover, these locations captured changes in mean SWC (NSCE = 0.69, and 0.65, and RMSE = 1.96, and 1.96 %, respectively). This demonstrates the feasibility of using the temporal stability of SWC to acquire mean SWC on karst hillslopes of southwestern China. The indirect method, which estimates mean SWC by considering the offset between the mean and the measurement value at a time-stable location, predicted mean SWC (NSCE = 0.86, and 0.76, and RMSE = 1.29, and 1.63 %, respectively) more precisely than the direct method (mean SWC directly measured at a time-stable location), because it eliminates deviation by introducing a constant offset (MRD). We recommended the use of the indirect method to acquire mean SWC values, when an allowable bias of 5 % for both MRD and SDRD can not be achieved. In addition, we found that soil texture, RFC, and elevation affect the pattern of SWC on the shrub hillslope. These results are expected to be useful for monitoring soil water dynamics on karst hillslopes, especially for restoration purposes.
登录
查看更多内容
土地利用和土地覆盖变化对西南岩溶山坡土壤水分和导水率的影响
影响因子：
2.8
作者：
chen,xi;zhang,zhicai;chen,xunhong;shi,peng
通讯作者：
shi,peng
灌丛和草地地表土壤含水量时空变异行为
影响因子：
6.1
作者：
Hu, Wei;Shao, Mingan;Han, Fengpeng;Reichardt, Klaus
通讯作者：
Reichardt, Klaus
利用中国黄土高原四种土地利用 10 年来时间稳定性估算土壤储水量
影响因子：
6.4
作者：
Liu, Bingxia;Shao, Ming'an
通讯作者：
Shao, Ming'an
DOI：
10.5194/hessd-4-1185-2007
发表时间：
2007-05
期刊：
Hydrology and Earth System Sciences Discussions
影响因子：
--
作者：
X. Zhou;Henry Lin;Qing Zhu
通讯作者：
X. Zhou;Henry Lin;Qing Zhu
影响因子：
13.5
作者：
Jacobs, JM;Mohanty, BP;Miller, D
通讯作者：
Miller, D