高黎贡山南段2种森林类型的土壤特性研究

对设于高黎贡山自然保护区南段中山湿性常绿阔叶林的5块样地和季风常绿阔叶林3块样地的土壤进行了调查研究,结果表明:2种森林类型主要有黄红壤、黄壤、黄棕壤、棕壤4种土壤。样地土壤的有机质等养分含量丰富,而土壤盐基饱和度较低。中山湿性常绿阔叶林样地的土壤养分含量、阳离子交换量明显高于季风常绿阔叶林。2块中山湿性常绿阔叶林样地的土壤总孔隙度大于50%,通透性尚好,其余样地土壤通透性稍差,样地土壤的交换性能较好。     

车载超低容量喷雾机液位自动检测装置的研究

目前喷雾机的药箱一般内置于喷雾机罩内,不易观察其液位的情况,给施药人员带来很多不便。基于这些实际问题而设计出一套液位自动检测及报警的控制模块,即当药箱液位低于设定的阀值时报警装置启动,提示药液不足以进行药箱的换接,从而避免漏喷或施药量不足。     

自然保护区森林病虫害防治工作探讨

简述了自然保护区病虫害发生现状及防治工作中存在的问题，分析了自然保护区面临着大气污染及酸雨、气候变暖、外来生物入侵、森林火灾、人为干扰等一系列潜在危险性因素的威胁，提出了自然保护区病虫害防治工作的指导思想、原则和防治策略。     

Zum saisonalen Auftreten der Baumwolleule,Spodoptera littoralis (Boisd.) (Lep., Noctuidae) und ihrer Kernpolyedrose (NPV) in verschiedenen Distrikten Ägyptens

Infection rates of the nuclear polyhedrosis virus (NPV) in the cotton leafworm,Spodoptera littoralis larvae were assessed from 1985 through 1986 in clover fields at El-Behiera, El-Fayoum and El-Gharbia governorates. Infection rates of the pathogen were highest near the end of spring when the cotton leafworm larval populations were increasing. For the different governorates, the percentages of virus infection were almost higher in 1985-season than in 1986. El-Fayoum-larval population was the most infected by NPV followed by El-Gharbia and El-Behiera-populations, respectively. There was a positive correlation between infection rates of NPV on one hand, and density of larva and ambient temperature on the other.     

Chemical composition,antioxidant and antibacterial activities of extracts from <Emphasis Type="Italic">Schinus molle</Emphasis> wood branch growing in Egypt

In the present work, for the first time, the chemical components of essential oils (EOs) and extracts from wood branch (WB) resulted from the tree pruning wastes of Schinus molle L. grown in Egypt were evaluated for their antioxidant and antibacterial activities. EOs, methanol (ME), dichloromethane (DCME) and water (WE) extracts as antioxidant and antibacterial activities were measured. Total phenolic and flavonoid contents as well as analysis of extracts by gas chromatography–mass spectrometry (GC–MS) were reported. The major components in EOs were α-elemol, β-pinene, and α-phellandrene, in ME were 6-(4-chlorophenyl)-3-cyano-4-(N-benzylpiperazino)-2H-pyran-2-one, and 2-naphthalene methanol, decahydro-α,α,4a-trimethyl-8-methylene, in DCME were 12-methyl-E,E-3,13-octadecadien-1-ol, and 1,2-benzenedicarboxylic acid, dioctyl ester, and in WE were β-eudesmol, and (Z,Z,Z)-9,12,15-octadecatrienoic acid, 2,3-dihydroxypropyl ester. The highest total antioxidant activity was found with EOs (90 ± 1.23 %) and WE (86.30 ± 1.40 %). The lowest IC₅₀ values of 13.11 ± 3.00, and 12.66 ± 2.15 μg/mL were found with WE and EOs, respectively. EOs and WE were observed to have good antibacterial activity against Bacillus subtilis, Bacillus cereus, Staphylococcus aureus, Escherichia coli, Sarcina lutea, Pseudomonas aeruginosa, and Micrococcus luteus. In conclusion, the Schinus molle L. WB EOs and extracts might, indeed, be used as a potential source for pharmaceutical or food industries.     

黄土高原丘陵区定西县生态环境建设存在的问题和发展对策

对黄土高原丘陵区定西县生态环境建设的成果及生态修复工程存在的问题进行了阐述，并针对存在的问题提出了整个黄土丘陵区生态治理的发展对策。     

西藏色季拉山种子植物区系分析

色季拉山有种子植物1391种,隶属于491属,103科。其中裸子植物3科,9属,16种;被子植物100科,482属,1375种。色季拉山种子植物属的区系成分以温带成分为主,达324属,占总属数的73 4%,在植物区系的组成中居重要位置。种的区系成分以中国特有种占比例最大(573种,占总种数的41 49%),它们多是构成色季拉山优势植被类型的建群种和优势种的主要成分。类平均聚类分析表明,色季拉山种子植物区系与纬度偏北的太白山、中条山、太行山和太岳山植物区系比较接近,与纬度相近的庐山、木林子、神农架等植物区系差异较大。     

文山松毛虫幼虫耐饥饿及灯诱试验

文山松毛虫幼虫耐饥饿饲养和灯诱试验的结果表明 :文山松毛虫各龄幼虫均有一定的耐饥饿能力 ,且随龄期的增大而增强 ,但饥饿能显著影响下一代的虫口数量 ;文山松毛虫 5～ 6龄幼虫有较强的趋光性     

松材线虫病综合防治技术研究

1996－1999年在浙江省富阳市，新昌县等地开展了松材线虫病的综合防治技术研究，明确了松褐天牛补充营养，携带和传递松材线虫特性，研究出新型松褐天牛引诱剂（M99），并取得应用预测和防治松褐天牛的显著效果，采用松材线虫早期诊断，病木伐除清理，引诱监测，化学防治等综合防治技术扑灭了一个松材线虫病新发生地，建立了6700hm^2的综合防治示范林，总结出包含有八章五十一款的“浙江省松材线虫病工程治理技术规程”。     

我国城市森林建设初探

基于城市森林的内涵和功能以及城市森林建设的理论和法律依据,结合我国目前城市森林建设现状及存在的问题,提出了我国城市森林建设的思路和对策。