The fractal features of soil granule structure before and after vegetation destruction on Loess Plateau
Received date: 2002-05-10
Revised date: 2002-08-21
Online published: 2002-12-15
The fractal theory, a new study tool, has been widely applied in soil sciences in recent years. The fractal features of soil granule as well as progress made in soil science research on grain distribution, soil moisture, soil bulk capacity variance and so on are discussed. Based on the fractal theory and relative model, the fractal features of soil granule structure of forest land and different reclaimed farmland were studied in this paper. The results show that the fractal dimension of soil granule structure of forest land and different reclaimed farmland are between 2.32～2.91. The less the contents of the granule >0.25 mm and the water-stable granule, the more the fractal dimension of soil granule and the higher the soil fertility are. There exists close relationship between fractal dimension of soil granule and the contents of soil granule or water-stable granule composition in all kinds of land. The soil physical properties of forest land and different reclaimed farmland vary with the variations of the fractal dimension. The less the fractal dimension, the more the contents of >0.25 mm soil granule and the less the soil bulk density, the better the soil self-restraint capacity. The more the fractal dimension, the less the contents of >0.25 mm soil granule and the greater the soil bulk capacity, the less the soil self-restraint capacity. The results show to certain extent that man-made unreasonable land use is the main cause of soil degradation and eco-environmental deterioration.Vegetation recovery and vehabilitation as well as increase ground coverage are principal countermeasures to reduce the Yellow River sedimentation and accelerate comprehensive control of the Loess Plateau.
Key words： Loess Plateau; vegetation destruction; soil structure; fractal features
DING Wen-feng, DING Deng-shan . The fractal features of soil granule structure before and after vegetation destruction on Loess Plateau[J]. GEOGRAPHICAL RESEARCH, 2002 , 21(6) : 700 -706 . DOI: 10.11821/yj2002060005
[1] Mandelbrot B B.From Chance an d Dimension.San Fran cisco:Freeman,1977.
[2] 李保国.分形理论在土壤科学中的应用及其展望.土壤学进展,1994,22(1):1~10.
[3] 朱祖祥.土壤学.北京:农业出版社.1982.
[4] 孙波,赵其国.红壤退化中的土壤质量评价指标及评价方法.地理科学进展,1999,18(2):118~128.
[5] 孙波,赵其国,张桃林.我国东南丘陵山区土壤肥力的综合评价.土壤学报,1995,32(4):362~369.
[6] 蒋定生.黄土高原水土流失与治理模式.北京:中国水利水电出版社,1997.
[7] 陈浩,等.黄土丘陵沟壑区人类活动对流域系统侵蚀、输移和沉积的影响.地理研究,2001,20(1):68~73.
[8] 卢金发.黄河中游流域地貌形态对流域产沙量的影响.地理研究,2002,21(2):171~178.
[9] 刘秉正,李光录,吴发启.黄土高原南部土壤养分流失规律.水土保持学报,1995,9(2):78~86.
[10] 杨文治,余存祖.黄土高原区域治理与评价.北京:科学出版社,1992.
[11] 唐克丽.开发西部切入点的研究以黄土高原生态环境建设切入点为例.第四纪研究,2000,20(6):505~513.
[12] 史衍玺.人为开垦加速侵蚀下土壤质量演变及其机理研究.博士学位论文,中国科学院、水利部水土保持研究所,1998.
[13] T urcot t e D L.Fract al fragment at ion.J.Geography R es.,1986,9(12):1921~1926.
[14] Arya L M,Paris J F.A physical empirical model t o predict t he soil moist ure characterist ic from part icle-size distribut ion and bulk densit y dat a.Soil Sci Am.J.,1981,45:1023~1031.
[15] Alexandra Kravchenko,Renduo Zhang.Est imat ing t he soil water ret ent ion from particle-size distribut ion:a fractal approach.Soil Sci.Am.J.,1998,62(3):171~179.
[16] 龚元石,廖超子,李保国.土壤含水量和容重的空间变异及其分形特征.土壤学报,1998,35(1):10~15.
[17] 吴承祯,洪伟.不同经营模式土壤团粒结构的分形特征研究.土壤学报,1999,36(2):162~167.
[18] 杨培岭,罗远培,石元春.用粒径的重量分布表征土壤分形特征.科学通报,1993,38(20):1 896~1 899.
[19] 张世熔,邓良基,周倩.耕层土壤颗粒表面的分形维数及其与主要土壤特性的关系.土壤学报,2002,39(2):221~226.
[20] 查轩,黄少燕.植被破坏对黄土高原加速侵蚀及土壤退化过程的影响.山地学报.2001,19(2):109~114.
/
| 〈 |
|
〉 |