ISWC OpenIR  > 水保所知识产出(1956---)
黄土塬区深剖面土壤水分垂直分布特征 及其时间稳定性
韩晓阳1,2; 刘文兆1,3; 程立平4
Source Publication应用生态学报

环境下的表现特征具有重要意义.本研究基于长期定位监测数据,对2012 年9 月至2015 年12
月黄土塬区4 种土地利用方式0~15 m 剖面土壤水分状况进行分析.结果表明: 苜蓿草地( >7
年) 、休闲地、高产农田和低产农田平均土壤含水量分别为15.1%、22.0%、19.6%和21.1%( 0 ~
15 m、年度平均值) ; 干湿交替层季节性失水和蓄水分别出现在3—6 月和7—10 月,其深度范
围分别为0~2、0~4.6、0 ~ 3 和0 ~ 4.2 m.深层土壤水分具有较好的时间稳定性,其垂直分布受
化程度加大,2~10 m 土层形成稳定土壤干层,阻断了降水补给地下水的途径.对于其他3 种土地
利用方式下的土壤水分平衡,冬小麦生长季农田与休闲地均表现为负平衡; 玉米生长季高产农
田表现为负平衡,而低产农田与休闲地表现为正平衡; 在作物休闲期,农田与休闲地均表现为正
平衡.通过施肥处理所形成的高产农田的作物水分利用效率是低产农田的3 倍以上.

Other Abstract

Study of impacts of land uses on spatiotemporal dynamics of soil water content ( SWC) is
of great significance for understanding the performance characteristics of regional water cycling under
changing environment. Based on long-term located field observations,this paper explored the
temporal dynamics of soil water in 0-15 m soil profile under four land use types on the Loess Tableland
from September 2012 to December 2015. Results showed that the annually averaged SWCs over
the 0-15 m soil profile for alfalfa field,fallow field,fertilized cropland and unfertilized cropland
were 15.1%,22.0%,19.6% and 21.1%,respectively. Soil water contents along the shallow soil
profile exhibited seasonal and annual wetting and drying cycle from March to June and July to October,
and the profile depths were 0-2,0-4.6,0-3 and 0-4.2 m,respectively. Soil water contents
along the deep soil profiles had better temporal stability and were influenced by land-use types. During
the observation years,the yield and water consumption in alfalfa field increased,which caused
the increase of deep soil desiccation,the 2-10 m soil profile had become stable dry layer,blockingthe way of precipitation recharge. As for the soil water balance in other three land use types,it was
negative in cropland and fallow field during winter wheat growing season,however,during spring
maize growing season,it was negative in fertilized cropland but positive in unfertilized cropland and
fallow field. During the fallow period,it was positive in the three land use types. The crop water use
efficiency in the fertilized cropland was increased by more than 3 times than the unfertilized cropland.

Keyword土地利用方式 土壤水分区 时空变化 土壤干层 黄土塬区
Indexed By中文核心期刊要目总览
Document Type期刊论文
2.中国科学院生态环 境研究中心城市与区域生态国家重点实验室
First Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
韩晓阳,刘文兆,程立平. 黄土塬区深剖面土壤水分垂直分布特征 及其时间稳定性[J]. 应用生态学报,2017,28(2):430-438.
APA 韩晓阳,刘文兆,&程立平.(2017).黄土塬区深剖面土壤水分垂直分布特征 及其时间稳定性.应用生态学报,28(2),430-438.
MLA 韩晓阳,et al."黄土塬区深剖面土壤水分垂直分布特征 及其时间稳定性".应用生态学报 28.2(2017):430-438.
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