摘要
本文就森林土壤分类、立地分类和质量评价、生态系统中养分和水分循环以及林木肥效与生物固氮等问题的研究进展作了简要介绍。
This article briefly discusses some important questions in forestsoils research in recent years. (1) Classification of forest soils is a pre-requisite for any type of forest management. The primary goal of most cl-assification systems in the past has been to accurately evaluate sites in ter-ms of their potential volume production of wood; more recently, classific-ation systems based on a variety of relevant site features, is to determinewhich factors have significant influence on growth processes. This has re-sulted in the development of a number of more advanced systems of eval-uation, some of which approaches total site classification. (2) Forest siteclassification and forest site quality evaluation have been developing tosome quantitative aspects. Methods for estimation of site quality includedirect estimation of site index (site index curves, site index comparisonsbetween species, growth intercept) and indirect estimation of site index(mensurational methods, plant indicators, physiographic site classification.synecological coordinates, soil-site evaluation, soil surveys). More rece-ntly, site index and soilsite evaluation become the most widely acceptedmethods for estimating site quality. (3) Nutrient cycling and hydrologi-cal cycle in forest ecosystems: tensiometers and neutron scattering are nowwidely accepted methods for measurements of soil moisture; the importanceof nutrient cycling are recognized in forestry, and nutrient cycling hasbeen studied in varying degrees of detail for a number of forest ecosys-tem types in recent years. Ion exchanger and ion selective electrode arenow widely accepted methods to determine nutrients in the forest soils.(4) Fertilization on forest lands and biological nitrogen fixation:effec-tive and economical use of fertilizers in forest land largely depends on anunderstanding of the properties of various fertilizer materials and theirreactions in forest soils. Fixation of atmospheric nitrogen by microorgan-isms is probably the most important pathway for this element to enter theforest ecosystem.
出处
《世界林业研究》
CSCD
北大核心
1990年第2期23-30,共8页
World Forestry Research
