| 石漠化治理对岩溶地下水水化学和溶解无机碳稳定同位素的影响 |
| 摘要点击 1797 全文点击 1236 投稿时间：2014-11-10 修订日期：2014-11-30 |
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| 中文关键词 石漠化治理 岩溶 水化学 溶解无机碳 土地利用 |
| 英文关键词 rocky desertification treatment karst water chemistry dissolved inorganic carbon land use |
| 作者 | 单位 | E-mail | | 肖时珍 | 贵州师范大学中国南方喀斯特研究院, 贵阳 550001
西南大学地理科学学院, 重庆 400715
国家喀斯特石漠化防治工程技术研究中心, 贵阳 550001 | xiaoshizhen@gznu.edu.cn | | 熊康宁 | 贵州师范大学中国南方喀斯特研究院, 贵阳 550001
国家喀斯特石漠化防治工程技术研究中心, 贵阳 550001 | xiongkn@163.com | | 蓝家程 | 贵州师范大学中国南方喀斯特研究院, 贵阳 550001
国家喀斯特石漠化防治工程技术研究中心, 贵阳 550001 | | | 张晖 | 贵州师范大学中国南方喀斯特研究院, 贵阳 550001
国家喀斯特石漠化防治工程技术研究中心, 贵阳 550001 | | | 杨龙 | 贵州师范大学中国南方喀斯特研究院, 贵阳 550001
国家喀斯特石漠化防治工程技术研究中心, 贵阳 550001 | |
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| 中文摘要 |
| 以贵州关岭-贞丰花江岩溶石漠化综合治理示范区不同土地利用类型和不同石漠化治理模式的5个泉点为研究对象,分析泉水水化学特征及溶解无机碳(DIC)稳定同位素(δ13 CDIC)的分布和变化,揭示石漠化治理的岩溶效应和水质效应. 结果表明,研究区地下水水化学类型为重碳酸-钙型(HCO3-Ca),人类活动干预相对较少的水井湾、戈贝和毛家湾泉水的水质较好,而受农业活动影响较多的吊井和谭家寨泉水主要离子浓度和电导率都较高,水质相对较差; 泉水pH值、方解石饱和指数(SIc)和二氧化碳分压(pCO2)对土地利用或石漠化治理反应敏感,表现为水井湾、吊井、谭家寨和戈贝泉水中的pH值和SIc小于毛家湾泉水,相反pCO2明显大于毛家湾泉水; 水井湾、毛家湾、戈贝泉水中的(Ca2++Mg2+)/HCO3-当量比接近1:1,以碳酸风化碳酸盐岩为主,吊井和谭家寨泉水中(Ca2++Mg2+)相对HCO3-明显偏高,主要是因为受到农业活动强烈影响,可能有硫酸和硝酸参与了碳酸盐岩的溶蚀; 此外,雨季由于生物旺盛,泉水中的δ13 CDIC值较旱季偏轻; 不同泉水中δ13 CDIC平均值大小顺序为吊井(-12.79‰) < 水井湾(-12.48‰) < 戈贝(-10.76‰) < 毛家湾(-10.30‰) < 谭家寨(-6.70‰),反映了石漠化和农业施肥影响下的地下水的δ13 CDIC值偏重,石漠化治理后泉水的δ13 CDIC值则偏轻. |
| 英文摘要 |
| Five springs representing different land-use types and different karst rocky desertification treatment models were chosen at the Huajiang Karst Rocky Desertification Treatment Demonstration Site in Guanling-Zhenfeng Counties in Guizhou, to analyze the features of underground water chemistry and dissolved inorganic carbon isotopes (δ13 CDIC) and reveal the effect of rocky desertification treatment on karstification and water quality. It was found that, the underground water type of the research area was HCO3-Ca; the water quality of the springs which were relatively less affected by human activities including Shuijingwan Spring (SJW), Gebei Spring (GB), and Maojiawan Spring (MJW) was better than those relatively more affected by human activities including Diaojing Spring (DJ) and Tanjiazhai Spring (TJZ), the main ion concentrations and electrical conductivity of which were higher; pH, SIc and pCO2 were sensitive to land-use types and rocky desertification treatment, which could be shown by the higher pH and SIc and lower pCO2 in MJW than those in the other four springs; (Ca2++Mg2+)/HCO3- of SJW, MJW and GB were nearly 1:1, dominated by carbonate rock weathering by carbon acid, while the (Ca2++Mg2+) of DJ and TJZ was much higher than HCO3-, suggesting that sulfate and nitrate might also dissolve carbonate rock because of the agricultural activities; δ13 CDIC was lighter in wet season because of the higher biological activities; the average δ13 CDIC was in the order of DJ (-12.79‰)13 CDIC would be heavier after rocky desertification and lighter after the rocky desertification are treated and controlled. |
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