丘间地固沙林土壤水分动态变化特征  

Characteristics of Dynamic Variation of Soil Moisture of Sand-Fixing Forest Land among Moving Sand-Dunes

作　　者：闫德仁[1] 黄海广[1] 胡小龙[1] 袁立敏[1] 

机构地区：[1]内蒙古林业科学研究院,内蒙古呼和浩特010010

出　　处：《中国水土保持》2016年第5期26-29,76,共5页Soil and Water Conservation in China

基　　金：国家"十二五"科技支撑专题(2012BAD16B0204);多伦生态站项目(2015-LYPT-DW-025)

摘　　要：水分是影响固沙植被生长发育最重要的限制因素,同时也是沙漠环境中最容易受到影响的生态因子,定位观测研究流动沙地建立固沙植被后的土壤水分变化具有重要的现实意义。采用Watch Dog土壤水分自动监测系统,于2014年6月17日—10月31日定位定时记录了樟子松人工林、杨树人工林和榆树天然林土壤体积含水量数值,结果表明:相同降雨量条件下,不同固沙植被土壤重力水的入渗深度存在明显差异。降雨量20 mm左右时,榆树天然林地降雨入渗深度大于20 cm土层,杨树和樟子松林地大于40 cm土层;降雨量12 mm左右时,杨树林地降雨入渗深度达到40 cm土层,榆树林小于20 cm土层,樟子松小于40 cm土层。相同降水量条件下,不同固沙林降雨入渗到相同土层深度所经历的时间不同。在降雨量21.1 mm事件中,榆树天然林入渗到20和40 cm土层所经历的时间分别为降雨开始后4和9 h,樟子松林分别为5和9 h。Water is the most important limiting factor of growth and development of sand fixation vegetation and also an ecological factor which is the most easily affected in desert environment.Therefore,it is of momentous current significance to conduct positioning observation and study on soil moisture variation after building sand fixation vegetation on moving sand-dunes.The paper recorded the values of soil volumetric moisture content of Pinus sylvestnis plantation,poplar plantation and elm natural forest respectively during the period of June 17 to October 31,2014 at the fixed time and fixed location by using WatchDog soil moisture automatic monitoring system.The outcomes show that under the same rainfall conditions,the soil gravity water infiltration depth of different sand fixation vegetation is obviously different.When the precipitation is about 20 mm,the rainfall infiltration depth of elm natural forest is greater than 20 cm and poplar and Pinus sylvestnis plantation are greater than 40 cm.When the precipitation is about 12 mm,the rainfall infiltration depth of poplar forest reaches to 40 cm,elm forest is less than 20 cm and Pinus sylvestnis forest is less than 40 cm.Under the same conditions of rainfall,the duration of different sand fixation forests infiltrates to the same depth of soil is different.In the event of 21.1 mm rainfall,the infiltration duration of elm natural forest reaching to 20 cm and 40 cm is at the 4th and 9th hour and Pinus sylvestnis forest is at the 5th and 9th hour respectively after beginning the rainfall.

关 键 词：固沙林 土壤水分 动态变化 降水量 重力水入渗深度 浑善达克沙地 

分 类 号：S714.2[农业科学—林学]