干旱区生态环境知识资源中心(Arid): 青海高寒丘陵区土壤有效水的时间稳定性

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	青海高寒丘陵区土壤有效水的时间稳定性
其他题名	Time stability of soil effective moisture in alpine hilly region of Qinghai
	张鹏; 王冬梅; 丁聪; 李平
来源期刊	中国水土保持科学
ISSN	2096-2673
出版年	2019
卷号	17 期号:5
中文摘要	为了探究高寒丘陵区土壤有效水的时空变异特征,基于青海高寒丘陵区暗门滩小流域2018年58月土壤有效水数据,通过经典统计和时间稳定性分析,研究该区域土壤有效水的空间变异和时间稳定性特征。结果表明: 1)研究区各土层旱季耗水,雨季补水;表层( 0 ~ 20 cm)土壤有效水表现为强变异性,深层( > 20 ~ 100 cm)土层有效水均表现为中等变异性; 2) Spearman秩相关系基本均高于0.75,且呈现出极显著相关,研究区小流域> 20 ~ 100 cm土壤的有效水在整个观测期间都有较高的时间稳定性; 3) > 20 ~ 100 cm有效水平均相对偏差的变化范围( - 79.84% ~ 129.86%),及其标准差( 12.63% ~ 55.62%),随土层厚度的增加,土壤有效水平均相对偏差及其标准差的波动范围都逐渐减小,样点土壤有效水时间稳定性随土层厚度增加而增强; 4)通过相对差分分析选出各土层代表点,决定系数( 0.668 2 ~ 0.811 7),精度要求不高时,可用于小流域各层土壤有效水估算,并对流域植被配置优化以及水资源的高效管理提供指导。
英文摘要	[Background]In the semi-arid areas of Northwest China,soil moisture is one of the key factors limiting vegetation growth and ecological restoration. In the study area,the study of alpine inferiority and single species,soil temporal and spatial variability of soil water is beneficial to soil water management and vegetation reconstruction. [Methods] From May 15th,2018 to August 15th,2018, the soil moisture content of 55 water points in the small watershed of the Anmentan was measured with a CNC 503B neutron meter,measured every 15 days for a total of 7 times; for four soils the type of soil was sampled with a ring cutter,and the soil moisture characteristic curve was measured by an indoor experimental high-speed centrifuge. Then,the soil water content corresponding to the water potential of - 1 500 kPa was obtained on the soil water characteristic curve,which is the soil wilting coefficient. The data analysis was done by classical statistical method and time stability analysis,and the data processing tool adopted SPSS and Excel 2016. [Results]1) The soil in the study area consumes water during the dry season and replenishes water during the rainy season; the 0 - 20 cm soil layer shows strong variability,and the effective moisture in 20 - 100 cm soil layer shows moderate variability. 2 ) The Spearman rank correlation is basically higher than 0.75,and it shows a very significant correlation. The effective moisture of 20 - 100 cm soil in the small watershed of the study area has high time stability throughout the observation period. The number of points of probability is more than that of shallow layers, and the change of cumulative probability position is small. 3 ) The range of variation of effective horizontal deviation of 20 - 100 cm is - 79.84% - 129.86%,and its standard deviation is 12.63% - 55.62%. The relative deviation of soil effective moisture level and the fluctuation range of standard deviation are gradually reduced,and the effective moisture time stability of sample soil increases with the increase of soil layer thickness; the representative points of each soil layer are selected by relative difference analysis. 4) The determination coefficient R~2 is 0.668 2 - 0.811 7. [Conclusions] The surface soil layer shows strong variability and no time stability and the effective moisture in deep soil layer shows moderate variability and has high time stability. The stability shows a trend related to time. The closer the sampling time is,the larger the correlation coefficient is,and the trend decreases with the increase of time lag. The measuring point 18,the measuring point 29,the measuring point 12 and the measuring point 29 respectively represent the average effective moisture content of the soil in the soil layers of 20 - 40,40 - 60,60 - 80,80 - 100 cm in the study period.
中文关键词	高寒丘陵 ; 有效水 ; 时间稳定性 ; 代表点 ; 黄土高原
英文关键词	alpine hills effective moisture time stability representative point the Loess Plateau
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Agriculture
CSCD记录号	CSCD:6610215
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353299
作者单位	张鹏, 北京林业大学水土保持学院, 北京 100083, 中国. 王冬梅, 北京林业大学水土保持学院, 北京 100083, 中国. 丁聪, 北京林业大学水土保持学院, 北京 100083, 中国. 李平, 北京林业大学水土保持学院, 北京 100083, 中国.
推荐引用方式 GB/T 7714	张鹏,王冬梅,丁聪,等. 青海高寒丘陵区土壤有效水的时间稳定性[J],2019,17(5).
APA	张鹏,王冬梅,丁聪,&李平.(2019).青海高寒丘陵区土壤有效水的时间稳定性.中国水土保持科学,17(5).
MLA	张鹏,et al."青海高寒丘陵区土壤有效水的时间稳定性".中国水土保持科学 17.5(2019).