水资源与水工程学报

文章摘要

陶吉杨，谭军利，魏童，郑飞龙，张维江.宁南山区不同植被退耕林地及其坡位的土壤水分时空分布特征——以骆驼林流域为例Journal of Water Resources and Water Engineering[J].,2020,31(4):216-222

宁南山区不同植被退耕林地及其坡位的土壤水分时空分布特征——以骆驼林流域为例

Spatial and temporal distribution characteristics of soil water in different reforestation lands of slope positions in hilly area of Southern Ningxia: A case study of Luotuolin Watershed

DOI：10.11705/j.issn.1672-643X.2020.04.31

中文关键词: 土壤含水率时空分布退耕林地坡位植被类型宁南山区

英文关键词: soil water content spatial and temporal distribution reforestation land slope position vegetation type hilly area of Southern Ningxia

基金项目:宁夏回族自治区重点研发项目（2018BEG02010）；国家自然科学基金项目（51309135、31860590）；宁夏高等学校一流学科建设（水利工程）项目（NXYLXK2017A03）

Author Name	Affiliation
TAO Jiyang¹， TAN Junli^1,2,3， WEI Tong¹， ZHENG Feilong¹， ZHANG Weijiang^1,2,3	（1.宁夏大学土木与水利工程学院，宁夏银川 750021； 2.旱区现代农业水资源高效利用教育部工程研究中心，宁夏银川 750021； 3.宁夏节水灌溉与水资源调控工程技术研究中心，宁夏银川 750021）

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中文摘要:

为研究宁南山区退耕还林区不同坡位土壤水分时空分布规律，利用定点取样和室内实验相结合的方法，研究了天然沙棘和人工油松两个典型坡面的上、中、下3个坡位0~100 cm土层土壤含水率的动态变化，分析其沿深度方向变化和季节动态情况。结果表明：天然沙棘和人工油松土壤含水率最高的坡位与土壤容重最小、孔隙度最大的坡位一致，分别为中坡位和下坡位；坡位对天然沙棘土壤含水率的影响层在20 cm以下，对人工油松的影响层在40 cm以下；土壤含水率随降雨量增加而增大，天然沙棘土壤含水率对于降雨量的响应较人工油松更敏感；相同降雨条件下天然沙棘土壤含水率增幅大于人工油松；在不同坡位土壤水分的时空分布上，沿深度方向天然沙棘各坡位土壤含水率在20 cm以下土层出现差异，人工油松在40 cm以下土层出现差异，当月降雨超过200 mm时，天然沙棘各坡位间土壤含水率的差异性减小，人工油松各坡位的差异性增大,这说明植被类型对土壤含水率的分布具有重要影响。

英文摘要:

In order to investigate the spatial-temporal distribution of soil water in the reforestation hilly area of different slope positions in Southern Ningxia, the seasonal dynamics and vertical changes of soil water content in 0-100 cm soil layer at upper, middle, and lower slope positions of two typical slopes with natural forest of sea-buckthorn and artificial forest of pinus tabulaeformis were studied by in-situ field sampling and laboratory experiments. The results showed that the slope position with the highest soil water content was consistent with the slope position with the most favorable soil bulk density and pore conditions, which happened at the middle slope position of sea-buckthorn forest and the lower of pinus tabulaeformis forest. The slope position influenced the soil water content of natural sea-buckthorn forest below 20 cm soil depth，and below 40 cm to pinus tabulaeformis. Soil water content increased with the increase of rainfall, and the effect of rainfall on the soil water of natural forest was greater than that of artificial forest. Under the same rainfall condition, soil water content of natural sea-buckthorn forest increased more than that of artificial pinus tabulaeformis forest. The significant difference of soil water between slope positions occurred under 20 cm soil depth for natural sea-buckthorn forest, and under 40 cm soil depth for artificial pinus tabulaeformis forest. When the monthly rainfall exceeded 200 mm, the difference of soil moisture among slop positions reduced for natural sea-buckthorn forest but increased for artificial pinus tabulaeformis forest, which indicated that vegetation type had an important influence on the distribution of soil moisture content.

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