分析了长江中下游湘、赣、鄂、皖四省的森林植物多样性现状和潜在危机。统计结果表明，该区植物（包括种子植物、蕨类植物和苔藓植物）物种多样性水平估计为1万种，具古老性、特有性、稀有性和复杂性等特点。该区生物多样性现状是不容乐观的，物种、基因和生态系统诸层次的多样性均受不同程度的破坏，它对经济持续发展、环境保护等方面有潜在的负面影响。提出了该区生物多样性保护的若干对策。

从森林生态环境价值的角度，说明了天然林的生态环境价值远大于其实物形态的经济价值，并大于人工林的生态环境价值；提出了建立森林生态环境补偿机制是实施天然林保护工程的保障，森林生态环境质量评价是实施天然林保护工程的一项基础工作，并构建出区域水土流失潜在风险评价的指标体系框架和评价方法。最后提出了确定天然林保护对象的三个因素即生态脆弱性，天然林保护目标和社会经济因素。

Vector analysis technique and ecological sequential comparison methods were adopted to study tree growth response to the micronutrients, B, Mo, Cu, Zn, Fe, and Mn, in soils derived from various parent materials in the fcrest area of Taibu Lake region in southeast China. The results showed that the dry weight of individual current. year needle of Chinese fir (Cunninghamia lanceoIata) grown on the soil derived from granite parent rock was increased by 8% and 13% in comparison with that grown on the soils derived from sandstone and ash-tuff parent rock, respectively. And such dry weight of loblolly pine (Pinus taeda) grown on the soil derived from sandstone parent rock was increased by 21% in comparison with that on the soil derived from ash-tuff parent rock. One of the reasons for those results was that micronutrients content in the soil derived from ash-tuff parent rock were not sufficient to meet the requirement of the growth of Chinese fir and loblolly pine, i.e., micronutrients in soil were deficient and/or induced deficient. The amounts of Cu, Zn. Fe. and Mn uptake by Chinese fir and lobtolly pine were in agreement with the contents of available micronutrients in soil respectively, except for B and Mo. Meanwhile, there might exist an "antagonism" between the uptake of B versus Mo by trees, although more studies are needed to confirm it. Regression analysis indicated that amount of a soil available micronutrient was correlated to the type of parent material and its total amount in the forest floor, except for B. The F test identified that the correlation of each; equation reached the significant level to different extents, respectively. The t test confirmed that amount of available forms was mainly depended on the type of parent material for Mo, Cu, Zn and Mn but on the forest floor for Fe. There was a feedback effect of forest stand on the amount of soil available micronutrients. The ability of accumulating available micronutrients in soil was better by the sawtooth oak(Quercus acutissima) stand than by the Chinese fir stand(except for B). The ability of accumulating available Zn, Fe, Mn and Mo in soil was better by the Chinese fir stand than by the loblolly pine stand, while as for available B and Cu, by the latter was better than by the former. When discussing the effect of forest stand on the amount of soil available micronutrients, not only the amount of micronutrient in the forest floor and the parent materials but also the amount of micronutrient taken up by current-year needles have to be considered.

研究了北亚热带25a生栓皮栎林、杉木林、火炬松林、毛竹林和5年生2代杉木萌芽林土壤中B、Mo、Cu、Zn、Fe、Mn 的有效含量、在土壤剖面中的分布规律、影响其有效性的土壤因子以及不同林分对土壤微量养分含量的影响。结果表明，在该地区的森林土壤中，有效B，Mo，Cu的平均含量均低于各自临界值，有效Zn平均含量接近临界值，Fe，Mn 含量丰富；有效微量养分在土壤剖面中的分布因林分和元素种类而异；影响微量元素有效性的主要土壤因子为有机质和有效磷含量；不同林分对土壤有效微量元素含量有显著影响，栓皮栎林土壤中有效微量养分含量最高，2代杉木萌芽林最低，其余林分居中且基本接近。

The effects of different types of Chinese fir stand, including those with various composition (pure and mixed), in various cropping systems (first and continuous cropping system) and at different ages, on the nutrient status of soils in the hilly regions of southern Anhui Province were studied by means of ecological sequential comparison Oil the basis of similar climate and soil type. The work was carried out in the XiaoXi Fbrest Farm Of Jingxian County and the Caijaqiao Forest Farm of Jingde County, where the soil is parayellow soil derived from phyllite and sandstone. The results revealed that with the increase of age, Chinese fir pure stand could accumulate organic matter and nitrogen in the soil but it resulted in decreasing of soil pH and base ions (especially Ca2+) compared to its mixed stand with broad-leaf trees such as Chinese sassafras. In order to improve the soil fertilityl it would be better to mix Chinese fir with broad-leaf trees when afforestation. In the management of Chinese fir pure stand, base compounds and phosphates should be added to the soil for maintaining soil fertility and raising forest productivity.