干旱区生态环境知识资源中心(Arid): 干旱区葡萄园土壤含水率时空变异性研究

Arid

	干旱区葡萄园土壤含水率时空变异性研究
其他题名	Spatio-temporal variability of soil moisture in a vineyard in arid region
	任彦秋; 李涛; 冷栋; 郝新梅
来源期刊	水力发电学报
ISSN	1003-1243
出版年	2016
卷号	35 期号:3 页码:47-55
中文摘要	土壤含水率是陆地表层系统的重要变量,广泛影响各种水文循环过程。研究土壤含水率的空间变异特性有助于了解上述循环过程,以定量管理农田水分,为制定精准灌溉制度提供依据。本研究在7.6 hm~2的葡萄园内以设置25 m*25 m均匀网格与随机取样相结合的方式,测定3年葡萄全生育期内147个取样点3个土层(0 ~ 20cm、20 ~ 40 cm、40 ~ 60 cm)的土壤含水率,结合传统统计学与地统计学方法,分析了土壤含水率空间变异特性的时间变化规律及其与土壤平均含水量之间的关系。结果表明:(1)一般来说,较湿润年份的土壤含水率变程较大,且表层土壤含水率的变程大于深层土壤,反之则反;(2)较干旱年份的表层土壤和较湿润年份的表层以下土壤含水率与其他情况下土壤含水率相比,空间结构性变异相对随机性变异的比例高,且随机性相对结构性变异的比例随平均含水率的增加而增加。研究结果将为更好地描述土壤含水率空间变异性及准确预测其空间分布提供依据,为制定合理、精确的灌溉管理措施提供参考。
英文摘要	Soil moisture content as an important variable in the land surface system, has significant influences on other components of hydrological cycles, and it is a key parameter in many hydrological models. Previous studies have shown that soil moisture in field conditions is highly variable in time and space. Therefore, knowledge of the characteristics of its variability is essential for understanding water flow processes in the field and for more accurate simulation of water movement in the field, and thus helpful to develop precision irrigation management practices. In this study, soil moisture contents were measured in a 7.6 hm~2 vineyard located in the arid region of Northwest China during early May to later September in three consecutive years (2012-2014) using time domain reflectometry (TDR). Measurements were taken 17, 16 and 19 times for these years, respectively. Soil moisture data were collected for three soil layers (0 ~ 20, 20 ~ 40 and 40 ~ 60 cm) on a regular grid of 25 m * 25 m with additional points arranged near some grid nodes. There were 135 points for 2012 and 147 points for the other two years. The spatial structure of soil moisture were described using a variogram model, and evolutions of the fitted model parameters including the range and degree of spatial dependence (ratio of nugget to partial sill) were analyzed within the same year and between the three different years. In addition, possible relationships of the model parameters versus mean soil moisture were investigated for the three years, and simple linear regressions were conducted between the range and degree of spatial dependence in terms of mean soil moisture. The main results were: (1) Soil moisture generally had a wide range, and the range tended to be wider for the surface soil than the deeper soil in a wet year while the trend was opposite for a relatively dry year; (2) Higher degrees of spatial dependence were found for surface soils of a dry year and deeper soils of a wet year, and the range and degree of spatial dependence were increasing with increasing soil moisture, indicating that higher overall soil moisture in soil profile generally lead to greater correlation length but also often intensify the random component of overall spatial variability. The results of this study would help better describe and simulate the spatial distributions of soil water content in field conditions, and thus help develop site-specific precision irrigation management practices.
中文关键词	土壤含水率 ; 干旱区 ; 葡萄园 ; 空间变异 ; 地统计学
英文关键词	soil moisture vineyard arid region spatial variability geo-statistics
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURAL ENGINEERING
WOS研究方向	Agriculture
CSCD记录号	CSCD:5672367
来源机构	中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234906
作者单位	中国农业大学水利与土木工程学院, 北京 100083, 中国
推荐引用方式 GB/T 7714	任彦秋,李涛,冷栋,等. 干旱区葡萄园土壤含水率时空变异性研究[J]. 中国农业大学,2016,35(3):47-55.
APA	任彦秋,李涛,冷栋,&郝新梅.(2016).干旱区葡萄园土壤含水率时空变异性研究.水力发电学报,35(3),47-55.
MLA	任彦秋,et al."干旱区葡萄园土壤含水率时空变异性研究".水力发电学报 35.3(2016):47-55.