Corrosion rate of carbonate tablet under diverse land use and lithology in the Dalongdong basin, Hunan
-
摘要: 选择湖南大龙洞流域寒武系中统熬溪组上段(∈2a3)白云岩、寒武系上统比条组下段(∈3b1)和奥陶系中统牯牛潭组(O2g)灰岩进行野外溶蚀试验,并测试林地和草地类型土壤剖面20cm、50cm深度土壤CO2浓度和有机质含量,以探讨林地、草地土地利用类型条件下试片溶蚀速率的差异特征。结果表明:(1)O2g、∈3b1和∈2a33种试片溶蚀速率在林地和草地土下20cm、50cm深度差异明显,∈3b1g灰岩林地土下20cm试片的溶蚀速率最大,达357.93mg/(m2?d);(2)试片溶蚀速率受岩性影响明显,CaO含量高,溶蚀速率大,O2g、∈3b1灰岩中CaO含量分别为35.38%、47.45%,较∈2a3白云岩的含量32.64%高,因而其溶蚀速率也较∈2a3的大;(3)埋放于林地土壤的试片其溶蚀速率大于草地,表明土地类型对溶蚀速率有较大的影响,植被从草地向林地的正向演替有利于岩溶作用的进行。Abstract: In order to discuss the differences of corrosion rates between the forestland and the grassland, tablets made of the Aoxi group dolomite(∈2a3) and the Bitiao group limestone(∈3b1) as well as the Guniutan group limestone（O2g）are used to test the soil CO2 concentration and organic content at 20 cm and 50 cm deep on soil profile in the Dalongdong basin, Hunan. It is concluded that, (1) the corrosion rates among the three tablets are quite different both under the forestland and the grassland at 20 cm and 50 cm deep on the soil profile with the ∈3b1g tablet the largest; (2) corrosion rates are affected obviously by lithology, the higher the CaO content the larger the corrosion rate, so the fewest the ∈2a3 tablet in CaO content(32.64 %), the smallest the corrosion rate of the ∈2a3 tablet; (3) the corrosion rate is larger under forestland than that under grassland, which proving the land type is of effect on corrosion rate. It will be benefit to karstification if the vegetation successes consequently towards forest from grass.
-
Key words:
- concentration of soil CO2 /
- content of soil organism /
- lithology /
- land use type
-
[1] 李大通,黄汉铎,黄萍益,等.中国可溶岩类型图(1∶400万)［M］.北京:地图出版社,1985. [2] 袁道先,蒋忠诚.IGCP379“岩溶作用与碳循环”在中国的研究进展［J］.水文地质工程地质,2002,(1):49-51. [3] 何师意,徐胜友,张美良.岩溶土壤中的CO2浓度、水化学观测及其岩溶作用关系［J］.中国岩溶,1997,16(4):319-323. [4] 刘再华,何师意,袁道先.土壤中的CO2及其对岩溶作用的驱动［J］.水文地质工程地质,1998,(4):42-45. [5] 章程,谢运球,吕勇,等.不同土地利用方式对岩溶作用的影响—以广西弄拉峰丛洼地岩溶系统为例［J］.地理学报,2006,61(11):1181-1188. [6] 夏青,姜光辉,李科,等.桂林峰丛洼地岩溶动力系统CO2特征及变化规律［J］.地质科学情报,2007,26(5):79-82. [7] 邓艳,覃星铭,蒋忠诚,等.表层岩溶动力系统中土壤水分及其岩溶效应［J］.应用生态学报,2009,20(7):1586-1590. [8] 何师意,潘根兴,曹建华.表层岩溶生态系统碳循环特征研究［J］.第四纪研究,2000,20(4):383-390. [9] 罗健,贾勇军,胡毅军,等.亚高山表层岩溶泉域土壤溶蚀速率季节变化及碳汇量估算——以重庆金佛山水房泉流域为例［J］.中国岩溶,2011,39(4):443-448. [10] 朱真.影响碳酸盐岩比溶蚀度、比溶解度因素探讨［J］.广西地质,1997,10(3):37-44. [11] 袁道先,蔡桂鸿.岩溶环境学［M］.重庆:重庆科学技术出版社,1988:62. [12] Jiang zhongcheng, Yuan daoxian. CO2 source-sink in karst processes in karst areas of China［J］. Episode, 1999,22(1):33-35. [13] 蒋忠诚,覃小群,曹建华,等.中国岩溶作用产生的大气CO2碳汇的分区计算［J］.中国岩溶,2011,30(4):363-367. [14] 曹建华,杨慧,康志强.区域碳酸盐岩溶蚀作用碳汇通量估算初探:以珠江流域为例［J］.科学通报,2011,56(26):2181-2187. [15] 章程.不同土地利用下的岩溶作用强度及其碳汇效应［J］.科学通报,2011,56(26):2174-2180. [16] 蓝芙宁,王文娟,覃小群,等.土地利用和覆被变化对岩溶区土壤CO2浓度的影响［J］.中国岩溶,2011,30(4):449-455. [17] 朱明秋,梁彬,陈宏峰,等.湘西大龙洞岩溶流域农业生态环境与治理措施［J］.中国岩溶,2005,24(3):220-226. [18] 梁永平,王维泰,段光武.鄂尔多斯盆地周边地区野外溶蚀试验结果讨论［J］.中国岩溶,2007,26(4):315-320. [19] 龚自珍,黄庆达.碳酸盐岩岩块野外溶蚀速度试验［J］.中国岩溶,1984,10(2):17-26. [20] 潘根兴,曹建华,何师意,等.土壤碳作为湿润亚热带表层岩溶作用的动力机制:系统碳库及碳转移特征［J］.南京大学学报,1999,22(3):49-52. [21] 谢芳,傅瓦利,王晓阳,等.重庆中梁山碳酸盐岩溶蚀速率对季节的响应研究［J］.中国岩溶,2010,29(4):410-413. -
点击查看大图
计量
- 文章访问数: 2307
- HTML浏览量: 406
- PDF下载量: 1505
- 被引次数: 0
下载:
