黔北山区坡面基岩出露特点及与坡面特征的关系

doi:10.16843/j.sswc.2022.06.003

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (2271 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract [Background] Rocky desertification is the most serious eco-geologically environment problem in the karst area of Southwest China. The surface exposed by outcropped boulders is a special landscape feature of rocky desertification slopes in karst regions of Southwest China. At present, there are few studies on the morphology, outcropping state and spatial distribution characteristics of outcropped boulders on the slope. This work aims to explore the outcropping characteristics of the outcropped boulders, and then provide a basis for the related researches on rocky desertification. [Methods] A typical rocky desertification slope in Zunyi city, Guizhou province was taken as the survey area. A full-slope carpet field survey was conducted, and a total of 375 exposed boulders were investigated. Firstly, We systematically investigated the spatial distribution, the direction of the outcropped boulders, and the heights of the outcrops as well as their influencing factors, such as slope gradient, altitude, slope aspect, and land use type. Then by using SPSS18.0 software (Statistical Product and Service Solutions 18.0), we explored the relationship between the exposed heights of boulders and the slope gradient. [Results] 1) The number of exposed boulders was the most in the middle of the slope (183 boulders), 1.63 times and 2.29 times of that on upslope and downslope, respectively. The reason was that the middle part of the slope suffered from more severe erosion and the soil thickness was relatively thinner. 2) The average height of exposed boulders on the slope was (0.35±0.25)m. In contrast, the influence of slope gradient on the height of exposed boulder was greater than that of other factors. With the increase of slope gradient (0°-15°), the height of exposed boulders increased in the form of a power function. 3) The direction of most boulders was crossed with the slope aspect, and there were significant differences in exposed height between different directions, following a descending order of the vertical direction (0.43±0.23)m>the oblique cross direction (0.33±0.28)m>the parallel direction (0.26±0.20)m. The exposed boulders, striking vertically to the slope aspect, played an important role in retaining overland runoff and sediment. 4) The exposed height of boulders on agricultural land (0.32±0.26)m was smaller than that on secondary forest and grassland (0.37±0.18)m, confirming the land changing model of "native forest and grassland-farmland-rocky desertification land-secondary forest and grassland" under the influence of mankind in karst areas. [Conclusions] The number and height of exposed boulders are closely related to the characteristics of the rocky slope. This study provides a useful reference for understanding the basic characteristics of outcropped boulders on rocky desertification slopes in karst area and carrying out relevant studies on soil erosion and earth surface processes more scientifically in Southwest China.

Key words： exposed boulders direction of boulders slope gradient rocky desertification soil erosion Guizhou province

Received: 24 August 2020

PACS:

S157

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	MA Qianhong
	KE Qihua
	ZHANG Keli
	GU Zaike

Cite this article:

MA Qianhong,KE Qihua,ZHANG Keli, et al. Characteristics of exposed slope boulders and its relationship with slope features in the mountainous region of North Guizhou[J]. SSWC, 2022, 20(6): 17-24.

URL:

http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2022.06.003 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2022/V20/I6/17

[1]	熊康宁. 喀斯特石漠化的遥感―GIS典型研究:以贵州省为例[M]. 北京:地质出版社, 2002:17. XIONG Kangning. A typical study of remote sensing GIS on karst rocky desertification: A case study of Guizhou province[M]. Beijing: Geological Publishing House, 2002:17.
[2]	陈洪松, 冯腾, 李成志, 等. 西南喀斯特地区土壤侵蚀特征研究现状与展望[J]. 水土保持学报, 2018, 32(1): 10. CHEN Hongsong, FENG Teng, LI Chengzhi, et al. Characteristics of soil erosion in the karst region of Southwest China: Research advance and prospective[J]. Journal of Soil and Water conservation, 2018, 32(1): 10.
[3]	王世杰. 喀斯特石漠化概念演绎及其科学内涵的探讨[J]. 中国岩溶, 2002, 21(2): 101. WANG Shijie. Concept deduction and its connotation of karst rocky desertification[J]. Carsologica Sinica, 2002, 21(2): 101.
[4]	WANG Shijie, LIU Miao, ZHNAG Dianfa. Karst rocky desertification in southwestern China: Geomorphology, land use, impact and rehabilitation[J]. Land Degradation and Development, 2004, 15(2):115.
[5]	JIANG Zhongcheng, LIAN Yanqing, QIN Xiaoqun. Rocky desertification in Southwest China: Impacts, causes, and restoration[J]. Earth Science Reviews, 2014, 132(3): 1.
[6]	党宇宁, 南亲江, 吴虹. 坡度因子对喀斯特石漠化的影响[J]. 地质学刊, 2016, 40(4): 674. DANG Yuning, NAN Qinjiang, WU Hong. Effects of slope factors on karst rocky desertification[J]. Journal of Geology, 2016, 40(4): 674.
[7]	李瑞玲, 王世杰, 熊康宁, 等. 贵州省岩溶地区坡度与土地石漠化空间相关分析[J]. 水土保持通报, 2006, 26(4): 82. LI Ruiling, WANG Shijie, XIONG Kangning, et al. Correlation between rocky desertification and slope degree in karst area of Guizhou[J]. Bulletin of Soil and Water Conservation, 2006, 26(4):82.
[8]	石军南,卢海燕,唐代生, 等. 岩溶地区坡度与土地石漠化的空间相关性分析[J]. 中南林业科技大学学报, 2012, 32(10): 84. SHI Junnan, LU Haiyan, TANG Daisheng, et al. Correlation analysis between rocky desertification and slope degree in karst area of Shaodong county[J]. Journal of Central South University of Forestry and Technology, 2012, 32(10): 84.
[9]	WANG Dianjie, SHEN Youxin, HUANG Jin, et al. Rock outcrops redistribute water to nearby soil patches in karst landscapes[J]. Environmental Science and Pollution Research, 2016, 23(9): 8610.
[10]	GONG Tiexiong, ZHU Yuanjun, SHAO Mingan. Effect of embedded-rock fragments on slope soil erosion during rainfall events under simulated laboratory conditions[J]. Journal of Hydrology, 2018(563): 811.
[11]	王济, 蔡雄飞, 雷丽, 等. 不同裸岩率下我国西南喀斯特山区土壤侵蚀的室内模拟[J]. 中国岩溶, 2010, 29(1):1. WANG Ji, CAI Xiongfei, LEI Li, et al. Laboratory simulation on soil erosion under different bedrock outcrop rate in Southwest karst area, China[J]. Carsologica Sinica, 2010, 29(1):1.
[12]	DAI Quanhong, PENG Xudong, YANG Zhi, et al. Runoff and erosion processes on bare slopes in the Karst rocky desertification area[J]. Catena, 2017(152): 218.
[13]	彭旭东, 戴全厚, 杨智, 等. 喀斯特山地石漠化过程中地表地下侵蚀产沙特征[J]. 土壤学报, 2016, 53(5): 1237. PENG Xudong, DAI Quanhou, YANG Zhi, et al. Sediment yield of surface and underground erosion in the process of rocky desertification of Karst area[J]. Acta Pedologica Sinica, 2016, 53(5): 1237.
[14]	白云峰, 周德培, 冯君. 顺向坡岩层走向与边坡走向夹角的上限值[J]. 西南交通大学学报, 2005, 40(3): 326. BAI Yunfeng, ZHOU Depei, FENG Jun. Upper limit of angle between strikes of slope and strata for dip slope[J]. Journal of Southwest Jiaotong University, 2005, 40(3): 326.
[15]	殷亮. 喀斯特石牙出露坡地产流产沙特征及影响因素研究[D]. 昆明:云南大学, 2017: 11. YIN Liang. Study on characteristics and influencing factors of runoff and sediment yield in karst slate field[D]. Kunming:Yunnan University, 2017: 11.
[16]	陈金珂, 蒲俊兵, 李建鸿,等.典型岩溶流域不同坡度等级下的土壤侵蚀与石漠化分布特征耦合分析[J].水土保持研究, 2020, 27(5): 1. CHEN Jinke, PU Junbing, LI Jianhong, et al. Coupling of rocky desertification distribution and soil erosion under different slope grades in a typical karst basin[J]. Research of Soil and Water Conservation, 2020, 27(5):1.
[17]	朱彤, 张科利, 马芊红, 等. 喀斯特地区块石出露坡面入渗特征[J]. 水土保持学报, 2020,34(4): 118. ZHU Tong, ZHANG Keli, MA Qianhong, et al. Infiltration characteristics of boulder outcropping slope in karst area[J]. Journal of Soil and Water Conservation, 2020,34(4): 118.
[18]	李瑞玲, 王世杰. 贵州岩溶地区岩性与土地石漠化的相关分析[J]. 地理学报, 2003, 58(2): 314. LI Ruiling, WANG Shijie. The correlation between rock desertification and lithology in karst area of Guizhou[J]. Acta Geographica Sinica, 2003, 58(2): 314.