干旱区生态环境知识资源中心(Arid): 云南石林地质公园土岩、土根界面过程和土下溶蚀速率

Arid

	云南石林地质公园土岩、土根界面过程和土下溶蚀速率
其他题名	Interface processes at soilrock, soilroot contacts and subsoil dissolution rate in Shilin Geopark, Yunnan
	章程; 李玉辉; 汪进良; 苗迎; 肖琼; 郭永丽
来源期刊	地质论评
ISSN	0371-5736
出版年	2020
卷号	66 期号:4
中文摘要	综合考虑土下界面过程对溶蚀速率的影响,不仅有助于客观评价不同土地利用下土壤溶蚀速率的差异及其控制因素,也有助于判别特定气候条件下区域或流域尺度的现代岩溶作用与碳循环强度。在云南石林世界地质公园,选择近原生滇青冈林(密枝林地)、云南松林地(人工辅助恢复林)、荒草地、石漠地等4种土地利用类型及不同界面开展为期2年的标准溶蚀试片(试片为圆形,直径40 mm,厚约3 mm)试验研究,同步测定土壤理化性质、水分、土壤CO_2。结果表明石林不同土地利用土下(土壤界面)平均溶蚀量为82.3 mg/a,最大年溶蚀量位于密枝林土下50 cm,达285.7 mg/a,最小年溶蚀量位于石漠地土下10 cm,为17.4 mg/a。总体上,土下年平均溶蚀量从大到小依次为密枝林地(182.6 mg),荒草地(76.4 mg),云南松林地(46.5 mg)与石漠地(23.8 mg)。土岩界面附近土下年溶蚀量为17.7~68.8 mg/a,均值为44.7 mg/a,从小到大依次为灌丛稀疏林(17.7 mg),石漠地(47.6 mg)与荒草地(68.8 mg)。土根界面附近土下溶蚀量为43 mg/a。土下溶蚀量要大于岩面溶蚀量,密枝林土下溶蚀量远远大于其它三种土地利用类型,荒草地和密枝林土下溶蚀量随土壤深度均呈现增加的趋势,尤其是后者的增幅相当显著,说明随着植被的正向演替可极大地促进岩溶作用的进行,提高碳酸盐岩溶蚀速率。石漠地岩土界面溶蚀速率约为岩面或正常土下溶蚀速率的2倍 ,为石柱水平土蚀凹槽的形成提供了岩溶作用动力学证据。利用密枝林地(原生性植被样本)土下溶蚀速率推断,石林形成鼎盛期的土下溶蚀速率为35.1~46 .8 mm/ka。
英文摘要	Objectives: Study on subsoil interface processes impact on dissolution rate is helpful for the evaluation of the dissolution rate changes in different land uses and its controlling factors, but also for determination of regional or watershed scale intensity of karst processes and carbon cycle under a given climatic condition. Methods: Four representative land uses were selected for 2-year long standard tablet (tablet is round with a diameter of 40 mm and a thickness of 3 mm) test in Shilin Geopark, Yunnan, one of UNESCO natural heritage sites of Southern China Karst. Tablets were placed at subsoil interfaces and different depth of soil profiles in preliminary forest, artificial pine land, grass land and rock desertification land. Meanwhile, the measurement of soil physicalchemical properties, monitoring of soil moisture with 1-hour interval, seasonal soil CO_2 contents measurement were deployed. Results:The results showed that the mean subsoil dissolution rate in different land uses is 82.3 mg/a, with maximum value of 285.7 mg/a at 50 cm soil depth of preliminary forest and minimum value of 17.4 mg/a at 10 cm soil depth of rock desertification land. In general, subsoil annual mean tablet weight loss in descendingorder is primary forest (182.6 mg), grass land (76.4 mg), artificial pine (46.5 mg) and deserted land (23.8 mg). Subsoil dissolution quantity at soilrock interface ranges 17.7~68.8 mg/a with a mean value of 44.7 mg/a, and the value of different landuses in rising order is pine land(17.7 mg/a), deserted land(47.6 mg/a) and grass land (68.8 mg/a). subsoil mean dissolution quantity at soilroot interface is 43 mg/a. Dissolution rate in soil is greater than that on rock surface, the rate in primary forest is much larger than that in other three land uses. Conclusions: Subsoil dissolution rate in grass land and primary forest goes up with soil depth increase, especially the latter with a remarkable growth, implying positive evolution of vegetation could improve karst processes exceedingly thus accelerate carbonate rocks dissolution rate. It is estimated that dissolution rate in the prime of formation of Shilin(stone forest) ranges 35.1~46.8 mm/ka, using the rate data in preliminary forest.
中文关键词	土下溶蚀速率 ; 土地利用 ; 土岩界面 ; 土根界面 ; 云南石林
英文关键词	subsoil dissolution rate land uses soilrock and soilroot interfaces Shilin Geopark, Yunnan
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Mineralogy
CSCD记录号	CSCD:6765053
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353413
作者单位	章程, 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林, 广西 541004, 中国. 汪进良, 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林, 广西 541004, 中国. 苗迎, 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林, 广西 541004, 中国. 肖琼, 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林, 广西 541004, 中国. 郭永丽, 中国地质科学院岩溶地质研究所, 自然资源部/广西岩溶动力学重点实验室, 桂林, 广西 541004, 中国. 李玉辉, 云南师范大学旅游与地理科学学院, 昆明, 云南 650500, 中国.
推荐引用方式 GB/T 7714	章程,李玉辉,汪进良,等. 云南石林地质公园土岩、土根界面过程和土下溶蚀速率[J],2020,66(4).
APA	章程,李玉辉,汪进良,苗迎,肖琼,&郭永丽.(2020).云南石林地质公园土岩、土根界面过程和土下溶蚀速率.地质论评,66(4).
MLA	章程,et al."云南石林地质公园土岩、土根界面过程和土下溶蚀速率".地质论评 66.4(2020).