石林的盛典——伊春小兴安岭石林国家地质公园揭碑开园侧记

金秋九月，伊春市汤旺河区人民迎来了一个大喜的日子，伊春小兴安岭花岗岩石林国家地质公园将在这里举行隆重的揭碑开园仪式。     

喀斯特荒漠化是一种地质—生态灾难

ＫＤＮ是一种ＧＥＯＬ－ＥＣＯＬ灾难,是发生潮湿的碳酸盐岩区的土壤侵蚀、土地退化与生态系统凋萎,致使人类很难生活在其中。ＫＤＮ是我国四大ＧＥＯＬ－ＥＣＯＬ灾害中最难整治、最难摆脱贫困的地区。本文按国际公认的原则为准,认定“石山化”≠ＫＤＮ,从地质结构性气候、物候和生态系统多因子厘定了ＫＤＮ术语,认定人为扰动与人口超载是其产生的序参量。其过程最迟也是３００多年前明清朝代屯垦开始,近半个世纪加速衰竭,森     

四川长宁石林地质遗迹景观资源特征及开发建议

长宁石林地质遗迹景观资源丰富,类型多样。最具代表性的景观资源是岩溶地貌,有溶洞、石林、天坑、漏斗、地缝、暗河、瀑布等,并有其他多种配套景观资源。这些地质景观资源具有重要的地学科研和美学观赏价值,具有较大的开发潜力。     

The effect of acid deposition on base cation cycling in a karstic-forested catchment： Evidence from strontium isotopes

Bedrock weathering and atmospheric deposition are the two primary sources of base cations （K^＋, Na^＋, Ca^2＋ and Mg^2＋） to forest ecosystems. Therefore, the key problem is to understand the relative inputs from these two sources and the cycling in the ecosystem. This study focuses on the effects of acid deposition on cation cycling in a small-forested karstic catchment in Guizhou Province. Sr isotope ratios were used as a tracer for understanding the transport process between the different cation pools： rock, soil, surface water, atmospheric deposition and plant. The samples of wet deposition, total deposition, throughfall, surface and ground waters, vegetation, and soil were monthly collected. The exchangeable Sr^2＋ and Ca^2＋ in soil samples were extracted by using 1 M ammonium acetate. The leaf-tissue samples were ashed at 550℃, and the residue was digested in ultrapure HClO4 and HNO3. All water samples were filtrated through 0.45 μm aperture filter paper. Base cation concentrations and Sr isotopic composition were analyzed for all the samples. The results show that acid deposition （average pH 4.9） frequently occurred in the studied region. Cation abundance follows an increasing manner from rainwater, throughfall, to surface water or ground water samples, suggesting that acid deposition at first eiuviates Ca^2＋ , Mg^2＋ and Sr^2＋ from leaf, then the exchangeable cations from soil, and at last cations accumulate in surface water or ground water.     

贵州喀斯特地区生态环境恶化的人为因素分析

贵州是喀斯特强烈发育的省区。由于人类活动的影响，近年来贵州喀斯特地区的生态环境出现了日益恶化的趋势，严重影响可持续发展甚至西部大开发战略的顺利实施。本阐述了喀斯地区生态环境恶化的现状，深入探讨了人为因素对喀斯特地区生态环境恶化的影响，为防止喀斯特地区生态环境进一步恶化提供科学依据。     

路南石林形态计量分析

从流域地貌结构的角度，分析了路南石林形态的相似性和差异性，并根据对石林形态测量的数据，借助于SPSS软件，运用多元统计学的方法，对石林形态进行计量分析，从而揭示了石林形态大小的内在本质规律-石林的高度与宽度的比值符合P-Ⅲ型曲线分布模型。