干旱区生态环境知识资源中心(Arid): 古尔班通古特沙漠南缘丘间地土壤水分特征曲线及模拟

Arid

	古尔班通古特沙漠南缘丘间地土壤水分特征曲线及模拟
其他题名	Characteristic Curves and Models Analysis of Soil Water in Interdune at the Southern Edge of Gurbantunggut Desert
	董义阳 1; 赵成义1 ; 于志同 2; 王丹丹 1; 班春广 1
来源期刊	水土保持学报
ISSN	1009-2242
出版年	2017
卷号	31 期号:1 页码:166-171
中文摘要	为研究干旱荒漠地区土壤水分特征的变化规律并探讨土壤水分特征曲线拟合模型的适宜性,以古尔班通古特沙漠南缘丘间地为研究对象,应用压力膜仪测定了丘间地剖面各土层(0-150cm)的土壤水分特征曲线,结合土壤容重、颗粒分布及饱和含水率等性质,分析了丘间地不同土层水分特征和孔隙大小的分布状况,明确了Gardner模型和van Genuchten模型拟合的适用性。结果表明:(1)丘间地剖面砂质土壤释水量伴随吸力呈规律性变化,低吸力段(0~100kPa)各土层水分特征曲线走势陡直,释水性强;中高吸力段(100~1 500kPa)曲线趋于平缓,持水性强。水分曲线特征与其物理性质一致,各土层物理性质差异较小,曲线的差异也较小。(2)丘间地剖面各土层大孔隙由上到下不断增加且20-40cm土层的小孔隙最多,有助于春季积雪融化迅速入渗到土壤里贮存,对植物吸收利用水分有重大意义。(3)两模型都能很好地拟合丘间地的土壤水分特征曲线,VG模型的拟合效果优于G模型,但G模型形式简单、参数少且易于求解,更便于实际应用。
英文摘要	In this paper,we evaluated the variations of soil water and explored the suitability of the soil water characteristic curve fitting model in interdune lowland at the southern edge of Gurbantunggut Desert.Using the pressure membrane apparatus,we measured the soil water characteristic curves at different soil depths(0-150 cm)in desert land.Combined with bulk density,grain size and saturated water content,the distributions of soil water characteristics and pore size in different soil layers were analyzed,and the applicability of Gardner model and van Genuchten model fitting was defined.Our data showed that the sandy soil release rate varied regularly with soil water suction rate in interdune lowland.Soil water characteristic curves in different soil layers showed a steep trend and strong water release in low suction range(0-100kPa),while they presented a smooth and slow trend,with a high water holding ability in high suction range(100-1 500 kPa).The soil moisture characteristic curve was consistent with its physical properties.The distribution of soil pore size varied regularly,with increasing the proportion of large pores from the top to the bottom soil layer and the small pores held the biggest ratio in 20-40 cm soil layer,which was conducive to the rapid infiltration of the spring snow melt into the soil.In addition,our results found that both the two models fitted well with the measured data in this region.The VG model was better than G model in fitting the soil water characteristic curve in interdune lowland,but G model was simple in form,with few parameters and easy solving, which was much more convenient for practical application.
中文关键词	土壤水分特征曲线 ; 模型拟合 ; 古尔班通古特沙漠 ; 丘间地
英文关键词	soil water characteristic curve fitting model Gurbantunggut Desert interdune
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5931023
来源机构	中国科学院新疆生态与地理研究所 ; 北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236664
作者单位	1.中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 乌鲁木齐, 新疆 830011, 中国; 2.北京师范大学全球变化与地球系统科学研究院, 北京 100875, 中国
推荐引用方式 GB/T 7714	董义阳,赵成义,于志同,等. 古尔班通古特沙漠南缘丘间地土壤水分特征曲线及模拟[J]. 中国科学院新疆生态与地理研究所, 北京师范大学,2017,31(1):166-171.
APA	董义阳,赵成义,于志同,王丹丹,&班春广.(2017).古尔班通古特沙漠南缘丘间地土壤水分特征曲线及模拟.水土保持学报,31(1),166-171.
MLA	董义阳,et al."古尔班通古特沙漠南缘丘间地土壤水分特征曲线及模拟".水土保持学报 31.1(2017):166-171.