黑河中游荒漠绿洲过渡带固沙植被土壤水分的分布特征

发布时间：2019-05-17 06:06

【摘要】：土壤水分是干旱区固沙植被生长发育的主要限制因子,了解其时空分布特征对荒漠绿洲过渡带植被建设具有重要意义。于2015年雨季前、雨季后对甘肃临泽县荒漠-绿洲过渡带的泡泡刺(Nitraria sphaerocarpa)、沙拐枣(Calligonum mongolicum)、梭梭(Haloxylon ammodendron)3种典型固沙植被0~120cm深度剖面的土壤水分分布特征进行研究,结果表明,1)雨季前和雨季后,泡泡刺、沙拐枣和梭梭灌丛土壤含水量随土层深度的增加基本呈上升趋势,土壤含水量均是表层低、深层高,雨季对泡泡刺、沙拐枣和梭梭灌丛土壤水分的影响主要集中在水分活跃层;2)雨季前,3种灌丛在不同水平距离处(0、1、2m与5m)土壤含水量的大小规律是泡刺灌丛沙拐枣灌丛梭梭灌丛;雨季后,3种灌丛在不同水平距离处土壤含水量无明显规律;3)雨季前和雨季后,泡泡刺灌丛和沙拐枣灌丛土壤含水量空间特征表现为灌丛边缘大于灌丛内部,梭梭灌丛表现为灌丛内部大于灌丛边缘。
[Abstract]:Soil moisture is the main limiting factor for the growth and development of sand fixation vegetation in arid area. It is of great significance to understand its temporal and spatial distribution characteristics for vegetation construction in the transitional zone of desert oasis. Before the rainy season in 2015 and after the rainy season, the soil water distribution characteristics of the 0~120cm depth profile of three typical sand-fixing vegetation, (Nitraria sphaerocarpa), Zigao jujube (Calligonum mongolicum), Haloxylon ammodendron (Haloxylon ammodendron), in the desert-oasis transitional zone of Linze County, Gansu Province, were studied. The results showed that: 1) before and after the rainy season, the soil water content of bubble thorn, Zizyphus jujuba and Haloxylon ammodendron thickets basically increased with the increase of soil depth, the soil water content was low in the surface layer, high in the deep layer, and opposite to the bubble thorn in the rainy season. The effects of soil moisture on soil moisture of Zizyphus jujuba and Haloxylon ammodendron were mainly concentrated in the active layer of water. 2) before the rainy season, the soil water content of the three kinds of thickets at different horizontal distances (0, 1, 2 m and 5 m) was as follows: the soil water content of the three kinds of thickets at different horizontal distances was not obvious after the rainy season, and the soil water content of the three kinds of thickets was not obvious at different horizontal distances. 3) before and after the rainy season, the spatial characteristics of soil water content in the acacia and jujube thickets were as follows: the edge of the thicket was larger than that of the inner part of the thicket, and the inner part of Haloxylon ammodendron was larger than that of the edge of the thicket.
【作者单位】：兰州交通大学环境与市政工程学院;
【基金】：国家自然科学基金(41161082、41561102)
【分类号】：S152.7

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