收稿日期: 2002-08-30
修回日期: 2003-03-04
网络出版日期: 2003-08-01
基金资助
中国科学院知识创新工程重点项目“西部生态环境演变规律与水土资源可持续利用研究”(编号:KZCX1-10-03-01);中国科学院寒区旱区环境与工程研究所知识创新项目“沙坡头固沙植被防护体系的稳定性问题与生态环境演变的研究”(编号:CACX210031);国家重点基础研究发展规划项目“中国北方沙漠化过程及其防治研究”(编号:G2000048704)资助.
THE INFLUENCE OF INITIAL SOIL CONDITIONS ON WATER PENETRATION AND SOIL MOISTURE DISTRIBUTION
Received date: 2002-08-30
Revised date: 2003-03-04
Online published: 2003-08-01
通过对沙坡头荒漠地区人工植被固沙区生物土壤结皮与固沙区外天然沙丘沙以及天然植被红砂、珍珠分布区砂粘土在不同初始含水率(θi)条件下土壤水平入渗过程的对比试验研究,探讨土壤质地以及θ i对水平入渗系数(λf)、剖面平均含水率(θm)状况的影响。生物土壤结皮对降水入渗量的截持作用大于沙丘沙,因而将显著地改变降水入渗过程中土壤水分的再分配格局,减少降水对深层土壤(沙丘沙)的有效补给。通过对土壤剖面平均含水率θm与距离湿润锋前缘0~5 cm、5~10 cm处体积含水率θfA、θfB比较,生物土壤结皮的θm、θfA和θfB分别约为沙丘沙的1.5倍。
李新荣 , 王新平 , 康尔泗 , 张景光 . 荒漠地区土壤初始状况对水平入渗的影响[J]. 地球科学进展, 2003 , 18(4) : 592 -596 . DOI: 10.11867/j.issn.1001-8166.2003.04.0592
More than forty years of revegetation using mainly Artemisia ordosica, and Caragana korshinskii at Shapotou Desert Experimental Research Station near Lanzhou has established a dwarf-shrub and herbaceous cover on stabilized sand dunes. Situated in southeast Tengger desert at 1 330 m elevation, it has an average annual rainfall of 191 mm with 83% received from May to September. Precipitation, as the sole source of water replenishment in the semi-arid area, plays a pertinent role in sustaining the desert ecosystem. The water penetration experiment on soils of microbiotic crust, fine sandy loam and pure dune sand at different initial soil moisture content (θi) were conducted by the horizontal penetration equipment in the laboratory. The soil moisture distribution was tested by sampling core soil at an interval of 5 cm from the point of water entrance. The results indicated that, for the selected experimental soils, water penetration coefficient (λf) were decreased in response to an increased θi, respectively. The λf of sand was much more high as compared to that of microbiotic soil crust and sandy loam at every single θi. The sandy loam has a less sharp decline feature of λf with an increased θi, in comparing with that of microbiotic soil crust and dune sand. Due to the soil texture peculiarity, λf is 4 times in microbiotic soil crust than that in dune sand, in spite of initial soil moisture content. The microbiotic soil crust has a value of 1.5 times of average soil moisture content both along the soil profile and at a distance of 0~5 cm and 5~10 cm from the wetting front than that of dune sand. We may conclude that the microbiotic soil crust has a more hydrophilic property, which contributes a big majority proportion in retaining rainfall than dune sand does in Shapotou regions.
[1] Yang Xiaohui, Zhang Kebin, Zhao Yunjie. Microbiotic soil crust—A research forefront in desertification-prone areas[J]. Acta Ecologica Sinica, 2001, 21(3): 474-480. [杨晓晖,张克斌,赵云杰.生物土壤结皮——荒漠化地区研究的热点问题[J].生态学报, 2001, 21(3): 474-480.]
[2] Li Xinrong, Jia Yukui, Long Liqun, et al. Advances in macrobiotic soil crust research and its ecological significance in arid and semiarid regions[J]. Journal of Desert Research, 2001, 21(1):4-11. [李新荣,贾玉奎,龙利群,等.干旱半干旱地区土壤微生物结皮的生态学意义及若干研究进展[J].中国沙漠, 2001,21(1): 4-11.]
[3] Williams J D, Dobrowolski J P, West N E. Microbiotic crust influence on unsaturated hydraulic conductivity[J]. Arid Soil Research and Rehabilitation, 1999, 13: 145-154.
[4] Li Xinrong, Wang Xinping, Li Tao, et al. Microbiotic soil crust and its effect on vegetation and habitat on artificially stabilized desert dunes in Tengger desert, north China[J]. Biology and Fertility of Soils, 2002, 35(3): 147-154.
[5] Zhang Jixian, Di Xingmin, Wang Shuxiang. Characteristics of regional eco-environmental variations in the processes of protective system establishment in the Shapotou area[A]. In: Shapotou Desert Experimental Research Station, Chinese Academy of Sciences ed. Annual Report of Shapotou Desert Experimental Research Station[C]. Lanzhou: Gansu Publishing House of Science and Technology,1993. 128-138. [张继贤,邸醒民,王淑湘.沙坡头地区防护体系建立过程中区域生态环境的变化特点[A].见:中国科学院沙坡头沙漠试验研究站编.中国科学院沙坡头沙漠试验研究站年报[C].兰州:甘肃科学技术出版社,1993.128-138.]
[6] Zhao Xingliang. Problems of revegetation on sand dunes in Shapotou area[A]. In: Shapotou Desert Experimental Research Station, Institute of Desert Research, Chinese Academy of Sciences ed. Research on Controlling the Shifting Desert (2) [C]. Yinchuan: Ningxia People’s Publishing House,1988.27-57.[赵兴梁.沙坡头地区植物固沙问题的探讨[A].见:中国科学院兰州沙漠研究所沙坡头沙漠科学研究站编著.腾格里沙漠沙坡头地区流沙治理研究(二)[C].银川:宁夏人民出版社,1988. 27-57.]
[7] Lei Zhidong, Yang Shixiu, Xie Senchuan. Soil Water Dynamics[M]. Beijing: Tsinghua University Press,1988. [雷志栋,杨诗秀,谢森传.土壤水动力学[M].北京:清华大学出版社,1988.]
[8] Malik R S, Butter B S, Anlauf R, et al. Water penetration into soil with different textures and initial moisture contents[J]. Soil Science, 1987, 144(6): 389-393.
[9] Chen Zhixiong, Wang Renzhen. The moisture retention of several important soils in China[J]. Acta Pedologica Sinica, 1979, 16(3): 277-281. [陈志雄,汪仁真.中国几种主要土壤的持水性质[J].土壤学报, 1979, 16(3): 277-281.]
[10] Yao Xianliang. Water problems of red soil in hilly region of central China I: The water regime of sloping red soil in lower hilly region[J]. Acta Pedologica Sinica, 1996, 33(3): 249-257. [姚贤良.华中丘陵红壤的水分问题I:低丘坡地红壤的水分状况[J].土壤学报, 1996, 33(3): 249-257.]
[11] Li Qinghui ed. Pedology and Agronomy (2nd)[M]. Bejing: Hydrohydraulic Press,1986. 19-72. [黎庆淮主编.土壤学与农作学(第二版)[M].北京:水利电力出版社,1986. 19-72.]
[12] Li Xinrong, Ma Fengyun, Long Liqun, et al. Soil water dynamics under sand-fixing vegetation in Shapotou area[J]. Journal of Desert Research, 2001, 21 (3): 217-222. [李新荣,马风云,龙利群,等.沙坡头地区固沙植被土壤水分动态研究[J].中国沙漠, 2001, 21(3): 217-222.]
[13] Hillel D, Gardner W R. Transient infiltration into crust-topped profiles[J]. Soil Science, 1970, 109: 69-76.
[14] Sackschewsky M R, Kemp C J, Link S O, et al. Soil water balance changes in engineered soil surfaces[J]. Journal of Environmental Quality, 1995, 24(2): 352-359.
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