试论植物作用对热带岩溶发育的影响——以广西弄岗自然保护区为例
ON THE EFFECT OF PLANT ACTIVITIES UPON THE TROPICAL KARST DEVELOPMENT CASE HISTORY OF THE LONGANG NATURE CONSERVATION REGION
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摘要: 鼻岗自然保护区位于广西南部龙州与宁明县交界,是我国目前保存较好的热带岩溶季节性雨林保护区。区内为上泥盆统至下二叠统碳酸盐岩。岩溶地貌以典型的热带切割较深的峰丛洼地为主。岩溶水以地下河迳流形式向左江和明江排泄。 本区热带雨林发育,复盖率达90％,植株密,林冠高。热带植物对岩溶发育的作用,主要是:1)林区气候受树木的影响,年降水量较外围多200—400毫米,相对湿度偏大22％,从而促进地下水的循环和溶蚀作用。2)大量的植物残体枯枝落叶使土壤中腐植质含量较高,并含有较丰富的微生物,所产生的有机酸和其它酸类,对岩石能起腐蚀作用。3)植物根系发达,主根粗壮,常沿岩石裂隙向纵深生长,常导致岩石的破碎崩解,有利于加强导水性能和溶蚀作用。4)林区岩溶水水化学受地质和生物因素的影响,其类型为重碳酸钙型水,一般不含侵蚀性CO_2,方解石饱和指数Slc>O。但个别点侵蚀性CO_2含量较高,而SlcAbstract: The Longang Nature Conservation Region is situated along the borders of Longzhou and Ningming counties, south Guangxi. It is at present a well protected tropical karst region with seasonal-rain forest. Geologically this region is characterized by carbonate rocks of Upper Devonian to Lower Permian. The karst feature is typified by deeply cut tropical peak-cluster depressions. Karst water drains to Zuojiang and Mingjiang rivers in the form of subterranean runoff. Tropical-rain forest is developed, cov...
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