| 桂西南岩溶山地优势植物种群动态及其对岩溶作用的影响 |
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| 关键词:karst Excentrodendron hsienmu population structure and dynamics karstification dynamic system |
| 基金项目:中国科学院西部行动计划项目(编号:KZCX2-XB2-08-02); 国家科技支撑计划(编号:2006BAC01A10); 中国科学院“西部之光”人才计划; 广西科学基金(编号:桂科基0575116); 国家自然科学基金项目(编号:30069005) |
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| Dynamics of Dominant Population and Its Influence on Karstification in Southwest Guangxi, China |
| In order to restore the vegetation in karst degradation areas, we should conduct research on vegetation succession and karst dynamic mechanism. The Excentrodendron hsienmu community is distributed in the primary forest of karst areas across the transitional zone of north tropic to south subtropic, southwestern Guangxi, southeastern Yunnan, and northern Vietnam, centering in Guangxi. In this paper the authors studied the population dynamics of Excentrodendron hsienmu in the process of vegetation succession and its effects on karstification dynamics of the environment based on seven field plots in Nonggan National Park of Guangxi, aiming to understand the interaction between the succession development in this seasonal rain forest and the karst base, hence to find methods to protect this endangered species and seek ways to restore the vegetations in degradation areas nearby."Spatial replacing temporal" approach was employed in the authors' studies to analyze the E. hsienmu population structure and dynamics and try to prove the mutual action between the karst dynamic process and the vegetation development. The results show: ① In the pioneer communities where big individual trees were absent but saplings and seedlings were abundant, the survival curve was convex approximating to linear, the population structure was initially expanding, the trend of E. hsienmu population structure evolved from initial increase to expanding growth and then to stable balance. ② In climax communities where the number of individual plant appeared rationally within each size class with high proportion of seedling and sapling but less big trees, the survival curves were concave or linear but fractured, the population structure was expanding or stably balanced, but broken. ③ Strong karstification was correlated to developed root systems of mature vegetation; the epikarst spring water properties reflected the vegetation effect on karstification in which concentrations of free CO2, HCO-3 are questionable, but pH value, Ca2+ and hardness of water decrease gradually in the process of vegetation development and succession, revealing the improvement of water quality. |
| LI Xian-kun,JIANG Zhong-cheng,HUANG Yu-qing,XIANG Wu-sheng,LÜ Shi-hong,YE Duo,SU Zong-ming.2008.Dynamics of Dominant Population and Its Influence on Karstification in Southwest Guangxi, China[J].Acta Geoscientica Sinica,29(2):253-259. |
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