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俞元春, DING Ai-fang, YU Yuan-chun, MENG Lei, LI Shu-feng
江苏林业科技,2001,28(3):14~17,-0001,():
-1年11月30日
采用孔洞根系生长法,研究了土壤中不同形态铝含量的变化及对杉木、马尾松根系生长的影响。结果表明:土壤中加入铝离子后,土壤pH下降,活性铝含量明显增加,孔洞中林木根系表现为明显的铝中毒症状;加入钙离子后,土壤pH升高,土壤中活性铝含量显著下降,根系生长得到改善;1a后,与原孔洞中土壤相比,土壤中总铝含量降低,交换态铝含量有所降低,腐殖质铝含量升高。
孔洞根系生长法, 酸性土壤, 铝形态, 迁移, 林木根系生长
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俞元春, YU Yuan-chun, DING Ai-fang, HU Jia, MENG Lei
南京林业大学学报,2001,25(2):39~42,-0001,():
-1年11月30日
研究了中国南方主要酸性土壤类型在模拟酸雨影响下土壤酸化和其缓冲性能及盐基的迁移特征,结果表明,酸雨淋洗引起土壤pH降低,盐基离子淋失,随着酸雨溶液pH的降低,土壤酸化趋势加剧,盐基淋失量增加,红壤对酸雨的缓冲性能好于砖红壤。淋出液中K+,Na+,Ca2+,Mg2+含量加上淋洗后土壤交换性K+,Na+,Ca2+,Mg2+含量大于原土壤中交换性K+,Na+,Ca2+,Mg2+总量,说明在酸雨淋洗下,土壤中某些矿物发生风化溶解,释放盐基进入土壤。
模拟酸雨, 酸性土壤, 酸化, 盐基离子, 迁移
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【期刊论文】Effects of Different Types of Chinese Fir Stands on Nu-trient Status of Soils*
俞元春, YU YUAN-CHUN and ZHANG HUAN-CHAO
Pedosphere 5 (1): 45-55, 1995,-0001,():
-1年11月30日
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.
broad-leaf tree,, Chinese fir,, mixed stand,, soil nutrient status
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俞元春, Zhang Yinlong, Yu Yuanchun, Zhang Jinchi
南京林业大学学报,1999,23(2):57~61,-0001,():
-1年11月30日
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。
天然林保护, 生态环境价值, 生态价值补偿机制, 水土流失潜在风险评价
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俞元春, Fang Yanming, Yu Yuanchun
南京林业大学学报,1999,23(2):31~36,-0001,():
-1年11月30日
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。
长江中下游, 生物多样性, 现状, 对策
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