| 典型岩溶断陷盆地溶蚀速率对海拔高度和土地利用方式的响应 |
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| 引用本文：柯静,邓艳,岳祥飞,梁锦桃,李旭尧,曹建华,吴松.2021.典型岩溶断陷盆地溶蚀速率对海拔高度和土地利用方式的响应[J].地球学报,42(3):407-416. |
| DOI：10.3975/cagsb.2020.072901 |
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| 作者 | 单位 | E-mail | | 柯静 | 中国地质科学院岩溶地质研究所, 自然资源部岩溶生态系统与石漠化治理重点实验室,自然资源部/广西岩溶动力学重点实验室 | ke_jingst@163.com | | 邓艳 | 中国地质科学院岩溶地质研究所, 自然资源部岩溶生态系统与石漠化治理重点实验室,自然资源部/广西岩溶动力学重点实验室 | dydesk@karst.ac.cn | | 岳祥飞 | 中国地质科学院岩溶地质研究所, 自然资源部岩溶生态系统与石漠化治理重点实验室,自然资源部/广西岩溶动力学重点实验室 | | | 梁锦桃 | 中国地质科学院岩溶地质研究所, 自然资源部岩溶生态系统与石漠化治理重点实验室,自然资源部/广西岩溶动力学重点实验室
桂林理工大学环境科学与工程学院 | | | 李旭尧 | 中国地质科学院岩溶地质研究所, 自然资源部岩溶生态系统与石漠化治理重点实验室,自然资源部/广西岩溶动力学重点实验室
桂林理工大学环境科学与工程学院 | | | 曹建华 | 中国地质科学院岩溶地质研究所, 自然资源部岩溶生态系统与石漠化治理重点实验室,自然资源部/广西岩溶动力学重点实验室 | | | 吴松 | 桂林理工大学环境科学与工程学院 | |
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| 基金项目:国家重点研发计划课题(编号: 2016YFC0502506);广西重点研发计划项目(编号: 桂科AB110004);基本科研业务费专项经费(编号: JYYWF20182003) |
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| 中文摘要:采用标准溶蚀试片法, 研究典型岩溶断陷盆地内不同海拔高度区域(中山区、平坝区和河谷区)6种土地利用方式下(弃耕地、草地、灌木地、松树林地、柏树林地及其他林地)的试片溶蚀速率, 并分析其影响因素。结果显示: 土下0–60 cm的试片平均溶蚀速率按大小排列顺序为: 松树林地((3.98±0.41) mg·cm–2·a–1)>草地((3.59±0.45) mg·cm–2·a–1)>弃耕地((3.16±0.42) mg·cm–2·a–1)>灌木林地((2.90±0.44) mg·cm–2·a–1)>其他林地((2.21±0.18) mg·cm–2·a–1)>柏树林地((2.16±0.28) mg·cm–2·a–1); 从土下5 cm到土下60 cm, 试片平均溶蚀速率逐渐增加; 试片溶蚀速率随海拔升高呈增加趋势, 与海拔呈极显著正相关(R=0.328, p<0.01)。以6种土地利用的土下试片平均溶蚀速率计算得出研究区平均岩溶碳汇强度为12.80 tCO2·km–2·a–1, 林地、耕地、草地下岩溶年碳汇量为11 613.11 tCO2·a–1, 约为珠江流域岩溶年碳汇量的0.38%。影响不同土地利用下试片溶蚀速率的主控因子各不相同; 降水、土壤有机质为试片溶蚀速率随海拔高度变化的主控因子; 土壤水分、土壤CO2为试片溶蚀速率随土壤深度变化的主控因子。该研究成果可为区域石漠化治理、生态修复工作和碳汇效应研究提供参考依据。 |
| 中文关键词:溶蚀速率 土地利用方式 海拔高度 影响因素 岩溶断陷盆地 |
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| The Response of the Karst Dissolution Rate to Altitude and Land Use Types in Typical Karst Faulted Basin |
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| Abstract:This research aims at revealing the response of the karst dissolution rate to altitude and land use types in typical karst faulted basin and exploring the effects of soil factors on karst dissolution rate. In this study, six different land use types (abandoned cultivated land, grassland, shrub land, pine forest land, cypress forest land, other forest land) with different altitudes (Zhongshan area, Pingba area and Valley area) were chosen in Xiaojiang River Basin of Yunnan Province as a case study to investigate karst dissolution in typical karst faulted basin. Standard dissolution test, correlation analysis, regression analysis and other statistical methods were used to compare the karst dissolution rates under different land use types, altitudes and soil depths, then determine the influence factors. The results show that the average karst dissolution rate of 0–60 cm under the soil was in order of pine forest land ((3.98±0.41) mg·cm–2·a–1) > grassland ((3.59±0.45) mg·cm–2·a–1) > abandoned cultivated land ((3.16±0.42) mg·cm–2·a–1) > shrub land ((2.90±0.44) mg·cm–2·a–1) > other forest land ((2.21±0.18) mg·cm–2·a–1) > cypress forest land ((2.16±0.28) mg·cm–2·a–1); from 5 cm to 60 cm under the soil, the average karst dissolution rate increased sequentially. And the karst dissolution rate had a very significant positive correlation with altitude (R=0.328, p<0.01). According to the preliminary estimation results of karst carbon sink in the study area, the average karst carbon sink intensity was 12.80 tCO2·km–2·a–1; the annual carbon sinks under the forest land, cultivated land and grassland totaled 11 613.11 tCO2·a–1, which was about 0.38% of the annual karst carbon sink in the Pearl River Basin. For the influence factors, the karst dissolution rate under each land use was different due to the different main control factors; Precipitation and soil organic matter were the main controlling factors for the karst dissolution rate with altitude; the soil moisture and soil CO2 were the main controlling factors affecting the karst dissolution rate in different soil depths. The research results can provide reference for regional rocky desertification control, ecological restoration and carbon sink research. |
| keywords:karst dissolution rate land use types altitude influence factors karst faulted basin |
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