对我国森林立地分类与评价问题的几点看法

本文首先回顾了国内一些学者近期有关森林立地分类和评价方面学术争论的要点,然后提出我国立地分类和评价应遵循的原则和方法,并着重论述在一个局部地区应如何抓住地形和土壤这两大因素在立地类型划分和评价中的重要性。     

森林分类经营的指标体系和技术标准

在简述林业分类经营背景的基础上,提出了林业分类经营的原则,重点提出了商品林和公益林分类指标体系和技术标准,最后探讨了国有林场的分类经营。     

林木种子的发芽技术

依据林木种子的生理、形态特征、解剖结构 ,在通常采用的 6种发芽方法中 ,选择适合于种子特征 (形态、生理 )的发芽方法 ,经 10 0个树种、 30 0 0多个种批的发芽验证 ,总结了 4类种子的发芽要点、技术条件 ,给出了 10 0个树种发芽率的最高值 ,为绿化造林、苗木培育的种子发芽提供参考依据     

我国实施森林分类经营中存在的问题

森林分类经营是当前林业界的热点问题之一，国家林业局已将其作为总体推进林业发展的龙头工作和全面推进林业政策的“牛鼻子”工程，但在实施森林分类经营中还存在着一些问题。诸如：林业观念问题、两类林的划分问题、公益林生态效益补偿机制等问题，本文就以上这些问题予以初步探讨。     

河北绣线菊属植物研究

作者在编写《河北灌木志》绣线菊属时,对采于河北境内的本属植物标本进行了分类与分布研究。现知河北原产17种3变种,其中1新种,2河北新分布记录种,1河北新分布记录变种。编制了分种检索表;指出了相近种的区别点;简略记述了适生条件及分布区域。     

Tree crop based agroforestry in Nigeria: a checklist of crops intercropped with cocoa

A survey of cocoa farmers in Bendel, Ogun, Ondo and Oyo States of Nigeria, carried out in 1985, showed that almost all the farmers intercropped other crops with cocoa. The intercrops included food crops such as plantain (92.3), cocoyam (85.7%), cassava (51.3%), yam (41.3%), maize (38.9%), melon (31.4%), cowpea (28.6%) and pineapple (26.0%) and tree crops such as oil palm (71.5%), kola (67.3%), coffee (41.0%), coconut (7.9%) and citrus (7.2%). Other crops are ewe-iran (Sarcophrynium brachystachys) and ewe-gbodogi (Megaphrynium macrostachyum) (45.2%), african walnut (Tetracarpidium conophorum) (42.2%), aligator pepper (Aframomum melegueta) (31.6%), and iyere (Piper guinense) (20.2%). Guava, mango, pawpaw and vegetables such as celosia, okra and solanum occur in cocoa plots at rather low frequencies. As many as six or more other crops can be intercropped with cocoa at the same time.     

甘肃自然保护区生态旅游资源的类型及综合评价

从自然保护区生态旅游发展的战略出发,分析了甘肃自然保护区生态旅游资源的类型,探讨了自然保护区生态旅游资源评价的目的和内容,以层次分析的定量方法为主,结合定性分析对甘肃自然保护区的生态旅游资源进行了科学的评价,分析了甘肃自然保护区生态旅游资源的价值和特点,在此基础上提出了甘肃自然保护区生态旅游资源开发的方向.     

Monophyly and infrageneric variation of Corispermum L.(Chenopodiaceae),evidence from sequence data psbB-psbH,rbcL and ITS

Corispermum is one of the most problematic taxonomic genera in Chenopodiaceae.To understand the phylogeny and infrageneric variation of Corispermum,we sequenced the nuclear ribosomal ITS region and two chloroplast DNA regions(rbcL and psbB-psbH) of 22 species and three varieties of Corispermum and the related genus Agriophyllum.Several representative species of Salsola,Suaeda,Chenopodium,Kalidium and Camphorosma served as outgroups.Our phylogenetic trees confirm that the tribe Corispermeae is monophyletic,Corispermum and Agriophyllum have a close relationship.Corispermum is demonstrated to be monophyletic,and contains at least four clades which,consequently,are served as the foundation of the infrageneric sectional variation of Corispermum,in terms of a combination of molecular data and morphological characters.The evolution of morphological characters for fruit wing and apex,two important characters in generic classification,is consistent with the sectional division of Corispermum,especially to the East Asian and Chinese taxa.