Different responses of ecohydrological processes in the re-vegetation area between the dip and anti-dip slope in a karst rocky desertification area in southwestern China
Different responses of ecohydrological processes in the re-vegetation area between the dip and anti-dip slope in a karst rocky desertification area in southwestern China
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DOI：
10.1007/s11104-020-04821-9
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发表时间：
2021-01
期刊：
影响因子：
4.9
通讯作者：
Wenjie Xiao;Yan Yang;Xiuyang Jiang;Zhili He;Xiaogang Zou;Xianhui You;Yunyue Yang;Z. Zeng
中科院分区：
文献类型：
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作者：
Wenjie Xiao;Yan Yang;Xiuyang Jiang;Zhili He;Xiaogang Zou;Xianhui You;Yunyue Yang;Z. Zeng
研究背景石漠化是一个经济、社会和环境问题，是指人类活动和人为活动使植被和土壤覆盖的喀斯特地区变成石质景观的过程。不同类型的土壤覆盖物对喀斯特石漠化地区重新植被过程中生态水文过程的影响尚不清楚。方法和目的利用2017年1月至2019年12月的月降水水化学资料和岩溶水溶解无机碳（DIC）δ 13 C值，分析了岩溶水溶解无机碳（DIC）δ 13 C值的变化规律。这揭示了不同土壤覆盖条件下δ 13 CDIC对岩溶槽谷倾斜/反倾斜斜坡水化学过程的控制机制。结果水化学变化受气候、土壤和植被的控制，具有明显的季节性。研究区δ 13 CDIC值（-16.88 ‰ ~-3.49 ‰）高于理论值（-14.00 ‰）。此外，还观察到降雨加速了喀斯特槽谷的土壤侵蚀（R2=0.7），人类活动（外源酸）导致DIC流失。斜坡，土壤，裸露的岩石覆盖上的倾斜的斜坡上的不同，反倾斜的slope.ConclusionsIn这项研究中，我们发现，不同的植被恢复方案和处理措施之间的倾斜和反倾斜的斜坡，应实施不同的植被恢复。水土资源特别是土壤的保护是石漠化地区生态恢复的关键。
BackgroundRocky desertification is an economic, social, and environmental problem, which refers to the processes and human activities that transform a karst area covered by vegetation and soil into a rocky landscape. The effects of different types of soil cover on ecohydrological processes during the revegetation of areas undergoing karst rocky desertification remain unclear. Taking different measures for different ecohydrological situations will benefit re-vegetation in karst rocky desertification areas.Methods and aimsMonthly/heavy rainfall hydrochemical data and the δ13C of dissolved inorganic carbon (DIC) in karst water samples from January 2017 to December 2019 were obtained. This revealed the controlling mechanisms on hydrochemical processes by δ13CDICunder different soil cover conditions in the dip/anti-dip slopes of a karst trough valley in Ganxi Town, Chongqing City, southwestern China.ResultsHydrochemical variations are controlled by climate, soil, and vegetation and show clear seasonality. The δ13CDICvalues (−16.88‰ to −3.49‰) in the study area were higher than the theoretical value (−14.00‰). In addition, it was observed that rain accelerated soil erosion (R2=0.7) in the karst trough valley and human activities (exogenous acid) resulted in DIC loss. The slopes, soil, and bare rock cover on the dip slope were different from that on the anti-dip slope, leading to the difference in their re-vegetation statuses.ConclusionsIn this study, we found that different vegetation restoration schemes and treatment measures should be implemented between the dip and anti-dip slope. The protection of soil and water resources, especially soil, is the key to ecological restoration in rocky desertification areas.