吉林大学学报(地球科学版)
吉林大學學報(地毬科學版)
길림대학학보(지구과학판)
JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION)
2015年
1期
232-239
,共8页
表层岩溶带%水化学成因%同比例溶解线%岩溶作用强度%广西马山弄拉
錶層巖溶帶%水化學成因%同比例溶解線%巖溶作用彊度%廣西馬山弄拉
표층암용대%수화학성인%동비례용해선%암용작용강도%엄서마산롱랍
epikarst zone%cause of water chemistry%equivaleng dissolution line%karstification intensity%Nongla,Mashan,Guangxi
常见的碳酸盐岩主要有灰岩和白云岩,两者的岩溶作用机理不同,因而常形成不同的地貌格局。在我国西南地区,若在小范围内有灰岩和白云岩出露时,往往在山体陡峭的部位出露质纯层厚的灰岩,而山间平原多出露白云岩。这种地层组合结构致使表层岩溶带的发育具有独特的双重岩性结构。基于兰电堂表层岩溶系统的研究,发现绝大部分水样的水化学类型均为 HCO3 Ca·Mg 型,其主要阳离子 Ca2+和Mg2+质量浓度的季节动态变化趋势不明显,但对短期降水稀释效应及森林植被 CO2效应的响应则非常迅速。将降水量小且比较均匀的8、9、10及12月水样的ρ(Ca2+)和ρ(Mg2+)关系曲线定义为"同比例溶解线",并用其判别不同降水条件下泉水化学成分差异的成因。另外,为了研究次生森林生态功能逐步恢复条件下岩溶作用强度的变化趋势,对近10年来弄拉表层岩溶泉水化学组分进行分析对比,发现岩溶水化学中主要阴、阳离子浓度均有增加趋势,也进一步佐证了森林植被的岩溶效应。
常見的碳痠鹽巖主要有灰巖和白雲巖,兩者的巖溶作用機理不同,因而常形成不同的地貌格跼。在我國西南地區,若在小範圍內有灰巖和白雲巖齣露時,往往在山體陡峭的部位齣露質純層厚的灰巖,而山間平原多齣露白雲巖。這種地層組閤結構緻使錶層巖溶帶的髮育具有獨特的雙重巖性結構。基于蘭電堂錶層巖溶繫統的研究,髮現絕大部分水樣的水化學類型均為 HCO3 Ca·Mg 型,其主要暘離子 Ca2+和Mg2+質量濃度的季節動態變化趨勢不明顯,但對短期降水稀釋效應及森林植被 CO2效應的響應則非常迅速。將降水量小且比較均勻的8、9、10及12月水樣的ρ(Ca2+)和ρ(Mg2+)關繫麯線定義為"同比例溶解線",併用其判彆不同降水條件下泉水化學成分差異的成因。另外,為瞭研究次生森林生態功能逐步恢複條件下巖溶作用彊度的變化趨勢,對近10年來弄拉錶層巖溶泉水化學組分進行分析對比,髮現巖溶水化學中主要陰、暘離子濃度均有增加趨勢,也進一步佐證瞭森林植被的巖溶效應。
상견적탄산염암주요유회암화백운암,량자적암용작용궤리불동,인이상형성불동적지모격국。재아국서남지구,약재소범위내유회암화백운암출로시,왕왕재산체두초적부위출로질순층후적회암,이산간평원다출로백운암。저충지층조합결구치사표층암용대적발육구유독특적쌍중암성결구。기우란전당표층암용계통적연구,발현절대부분수양적수화학류형균위 HCO3 Ca·Mg 형,기주요양리자 Ca2+화Mg2+질량농도적계절동태변화추세불명현,단대단기강수희석효응급삼림식피 CO2효응적향응칙비상신속。장강수량소차비교균균적8、9、10급12월수양적ρ(Ca2+)화ρ(Mg2+)관계곡선정의위"동비례용해선",병용기판별불동강수조건하천수화학성분차이적성인。령외,위료연구차생삼림생태공능축보회복조건하암용작용강도적변화추세,대근10년래롱랍표층암용천수화학조분진행분석대비,발현암용수화학중주요음、양리자농도균유증가추세,야진일보좌증료삼림식피적암용효응。
Limestone and dolomite are common carbonate rocks. Because of their different karstification mechanism,the different landscape would be formed.In Southwest of China,dolomite locates on the different classes of karst basis level of erosion,while the pure limestone locates at upper the mountain.So,the epikarst zone has a duality structure because of the special strata combination. Based on the mornitoring to discharge and hydrochemistry of Landiantang epikarst spring,Nongla, Guangxi,it is found that the hydrochemical type of most water samples is HCO3 Ca · Mg.The variation trend of the Ca2 + and Mg2 + is not very clear in seasonal timescale.But it is more sensitive to short-term precipitation dilution and CO2 effect of forest vegetation.“Equivaleng dissolution line ”(EDL)is defined by the relationship between concentration of Ca2 + and Mg2 + .In this paper,EDL can be used to distinguish the causes of the differences of spring hydrochemistry under different precipitation conditions.In addition,based on the analysis on nearly ten years data of the hydrochemistry and discharge data of Landiantang epikarst spring, it is shown that spring discharge and major ions concentration in karst water are all increased under the situation of vegetation restoration.All of above is further evidence of the vegetation effect in karst process.