| 陕西黄土高原人工林土壤干层及形成原因 |
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| 引用本文： | 赵景波,杜娟,陈宝群.陕西黄土高原人工林土壤干层及形成原因[J].地理学报(英文版),2007,17(1):114-126. |
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| 作者姓名： | 赵景波 杜娟 陈宝群 |
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| 作者单位： | [1]College of Tourism and Environment, Shaanxi Normal University, Xi＇an 710062, China [2]State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi＇an 710075, China |
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| 基金项目： | Foundation： National Natural Science Foundation of China, No.40672108; Project of State Key Laboratory of Loess and Quaternary Geology, CAS, No.SKLLQG0606 |
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| 摘 要： | 1 Introduction Abroad, a lot of research on soil water removal, seeping and evaporation has been done (Ole, 1998; Rapp, 2000). A seeping model of soil water was suggested (Yuin, 1998) and it was known that water removal is very slow in the unsaturated zon…
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| 关 键 词： | 地球 干燥 人工造林 黄土高原 |
| 收稿时间： | 19 June 2006 |
| 修稿时间： | 2006-06-192006-10-25 |
Dried earth layers of artificial forestland in the Loess Plateau of Shaanxi Province |
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| Zhao?Jingbo,Du?Juan,Chen?Baoqun.Dried earth layers of artificial forestland in the Loess Plateau of Shaanxi Province[J].Journal of Geographical Sciences,2007,17(1):114-126. |
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| Authors: | Zhao Jingbo Du Juan Chen Baoqun |
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| Institution: | 1. College of Tourism and Environment,Shaanxi Normal University,Xi'an 710062,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,CAS,Xi'an 710075,China
2. College of Tourism and Environment,Shaanxi Normal University,Xi'an 710062,China |
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| Abstract: | By determining the earth moisture content of artificial forestland between 0 and 6 m deep in the Loess Plateau of Shaanxi
province, the vertical change of moisture content, distribution and formation causes of a dried earth layer are researched.
The results show that the average moisture content is 9.3%–9.5% between 2 and 4 m under artificial forest of over 10 year’s
growth in Guanzhong Plain, and chronic weak dried earth layers are developed which show that the dried earth layers are distributed
extensively on the Loess Plateau. The southern boundary of the dried earth layer has reached the northern foot of the Qinling
Mountains. When precipitation reaches 600 mm, there are weak dried earth layers between 2 and 4 m under artificial forest
of more than 10 years old. When the precipitation is between 400 and 500 mm, there are moderate dried earth layers. When precipitation
is above 800 mm, there are no dried earth layers. There are no dried earth layers under meadow land, corn land and less than
5 years old of artificial forestland in central and southern parts of the Loess Plateau. The development of dried earth layers
under cypress forest is weaker than broad-leaved forest. Under the same climatic conditions, the development of dried earth
layers under the loess tableland is nearly at the same level as the 2nd and 3rd river terrace. Dried earth layers developed
in membrane water zone, and the buried depth is small and motion velocity is slow in the Loess Plateau, which is the direct
water factor of the formation of the dried earth layer, while differences of tree age and tree species are the plant factors
that consumed much moisture. From the depth of the gravity water and the membrane water in Guanzhong Plain, it is clear that
the formation cause of dried earth layers is mainly due to natural factors. The dried layers generally develop in middle-aged
artificial forestland that consumed too much moisture, which is the general character of earth moisture in subhumid and semiarid
zones. The appearance of dried layers doesn’t show that the forest doesn’t develop in this area; this is depended on their
development intensity. Artificial forest of Chinese poplar, locust tree and Chinese scholartree consuming less water can be
planted in the areas where dried earth layer developed weakly, but can not be planted in the areas where dried earth layer
developed intensely.
Foundation: National Natural Science Foundation of China, No.40672108; Project of State Key Laboratory of Loess and Quaternary Geology,
CAS, No.SKLLQG0606
Author: Zhao Jingbo (1953–), Ph.D. and Professor, specialized in physical geography. |
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| Keywords: | Plateau dried earth layer effective factors cause of formation soil moisture zone |
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