摘要
为了揭示希拉穆仁草原土壤含水量,水分存在形式,水分有效性,水循环和土壤干层等问题,对该区不同地形草地进行了打钻取样,对含水量及粒度进行测定与分析。结果显示:研究区多数土壤剖面中含水量变化在2%-10%之间,平均含水量多在3%-6%之间。高地采样区土壤水分垂向变化波动较大,变化趋势不明显;平地采样区土壤上中部含水量多于下部。研究区土壤水分大部分处于难效水状态,土壤水分对植被生长具有明显的抑制作用,但平地采样区在剖面上部0-0.5 m的平均含水量较高地采样区略多,表明平地采样区植被生长受到土壤水分的胁迫性相对较小。研究区普遍有干层发育且等级较高,干层分布接近地表。其中,高地采样区剖面0-0.5m全部为重度干层,下部有轻度干层和中度干层发育;平地采样区几乎全部为重度干层。该区春季5月份土壤水分几乎都以含量很低的薄膜水形式存在,大气降水被蒸发与蒸腾等全部消耗,没有剩余水分补给地下水。综上指示该区土壤水分为明显的负平衡,水循环呈现土壤-植物-大气的水分循环模式,属于不完整的水分循环类型。
In order to reveal the soil water content,water form,water availability,water cycle and dry soil layer of the Xilamuren grassland,the different terrain grasses in the area were drilled and sampled,and the water content and particle size were measured and analyzed.The results showed that the water content in most soil profiles in the study area varied between 2%-10%,and the average water content was between 3%-6%.The vertical variation of soil moisture in the high sampling area fluctuated greatly,and the change trend was not obvious.The water content in the upper middle part of the flat sampling area was higher than that in the lower part.Most of the soil moisture in the study area was in a state of inefficient water,and soil moisture had a significant inhibitory effect on vegetation growth.However,the flat sampling area had a slightly larger average water content in the upper part of the section from 0-0.5 m,indicating that the vegetation in the flat sampling area was high.Growth was relatively less stressful by soil water.Dry soil layer were generally developed and graded in the study area,and the dry soil layer distribution was close to the surface.Among them,the high-sampling area section 0-0.5 m was all heavy dry layer,the lower part had mild dry layer and moderate dry layer development;the flat sampling area was almost all heavy dry layer.In the spring of May,the soil water in the area was almost in the form of film water with very low content.The atmospheric precipitation was completely consumed by evaporation and transpiration,and no residual water was supplied to the groundwater.The soil water in this area is obviously negative balance,and the water cycle presents a soil-plant-atmosphere water circulation pattern,which is an incomplete water circulation type.
作者
陈志青
赵景波
罗小庆
邵天杰
胡倩
CHEN Zhiqing;ZHAO Jingbo;LUO Xiaoqing;SHAO Tianjie;HU Qian(College of Tourism and Environment,Shanxi Normal University,Xi’an,Shanxi 710062,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an,Shanxi 710075,China)
出处
《生态科学》
CSCD
2020年第2期1-7,共7页
Ecological Science
基金
国家自然科学基金项目(41210002)
中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQG1626)。
关键词
土壤含水量
有效水
土壤干层
水分平衡
希拉穆仁草原
soil water content
effective water
dry soil layer
water balance
Xilamuren grassland
