| 高寒沙地人工植被恢复区地表沉积物粒度特征 |
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| 引用本文： | 田丽慧,张登山,彭继平,吴汪洋,张佩.高寒沙地人工植被恢复区地表沉积物粒度特征[J].中国沙漠,2015,35(1):32-39. |
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| 作者姓名： | 田丽慧 张登山 彭继平 吴汪洋 张佩 |
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| 作者单位： | 1. 北京师范大学 环境演变与自然灾害教育部重点实验室, 北京 100875;
2. 青海省农林科学院, 青海 西宁 810016;
3. 国家林业局防治荒漠化管理中心, 北京 100714 |
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| 基金项目： | 十二五国家科技计划专题项目(2012BAD16D0102);国家自然科学基金项目(41461002);青海省自然科学基金项目(2014-2J-902) |
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| 摘 要： | 共和盆地位于青藏高原东北部,是典型的高寒干旱、半干旱荒漠区.青海省治沙试验站经过近50年的发展,形成以封沙育草区、固沙造林区和农田林网区为一体的绿洲防护体系,成为中国高寒沙地土地沙漠化综合整治的典型示范.本文选择典型固沙植物柠条(Caragana korshinskii)和乌柳(Salix microstachya),针对不同治理年限的沙丘和丘间地,探讨治理50年后人工植被恢复区地表60 cm深度土壤粒度的时空变化.结果表明:直播柠条能促进沙丘地表60 cm土层沉积物的细化,尤以地表5 cm更甚.土壤颗粒的变化与植被生长状况及物质来源有关.
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| 关 键 词： | 沙珠玉 地表沉积物 粒度 柠条(Caragana korshinskii) 乌柳(Salix microstachya) |
| 收稿时间： | 2014-10-17 |
| 修稿时间： | 2014-11-24 |
Grain Size of Land Surface Deposits in a Vegetation Restoration Region of the Alpine Sandy Land in Qinghai,China |
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| Tian Lihui;Zhang Dengshan;Peng Jiping;Wu Wangyang;Zhang Pei.Grain Size of Land Surface Deposits in a Vegetation Restoration Region of the Alpine Sandy Land in Qinghai,China[J].Journal of Desert Research,2015,35(1):32-39. |
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| Authors: | Tian Lihui;Zhang Dengshan;Peng Jiping;Wu Wangyang;Zhang Pei |
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| Institution: | 1. Ministry of Education Key Laboratory of Environmental Changes and Natural Disaster, Beijing Normal University, Beijing 100875, China;
2. Qinghai Academy of Agriculture and Forestry, Xining 810016, China;
3. National Bureau to Combat Desertification, State Forestry Administration, Beijing 100714, China |
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| Abstract: | The Gonghe Basin is a typical alpine arid and semi-arid sandy land, located in northeast of the Qinghai-Tibet Plateau, China. In 1958, the Sand-control Experimental Station of Qinghai Province was set up in Shazhuyu, one of the most serious desertification regions in the Gonghe Basin, to explore a suitable technology for cold sandy land restoration. After 50 years, Shazhuyu became a representative integrated renovation region for cold arid desertified land, forming a special oasis protection system, which is composed of areas of resorting vegetation by enclosure, stabilizing sand dunes by afforestation and protecting farmland by network of forest. We choose the typical sand-fixation plants Caragana korshinskii and Salix microstachya controlling in different years on sand dunes and lowlands to probe into the change of characteristics of land surface deposits from topsoil to the depth of 60 cm. Results show that the sediments in Shazhuyu are dominated by fine sand, consistent with other Chinese deserts' particles, while a clear difference made from sandy land in the Qinghai Lake Basin which was separated by the Qinghai South Mountain. Meanwhile, sediments in lowlands were phase alternating by aeolian sediments and river deposition. Even after decades of vegetation restoration on mobile dunes, soil mechanical composition was still dominated by sand, with clay and silt content increasing. It had a great effect on the top 5 cm soil texture when setting clay sand barrier. Following the years of governance, the role of water and chemical weathering happening, the clay gradually disappeared and the soil began to formation. Directly broadcasting C. korshinskii seed could promote refinement of sediments on surface 60 cm soil layer, especially, top of 5cm much finer. Meanwhile, the change of the soil particles related to vegetation growth and source of materials, particularly the distribution of vegetation. Because of the different initial states of existence in lowlands, the effect of Salix microstachya to grain size is difficult to describe. |
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| Keywords: | Shazhuyu land surface deposits grain size Caragana korshinskii Salix microstachya |
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