传真通信实现方式及其基本组成

本文以INTERNET网络传真机系统为对象，论述了系统的实现方法，并介绍了实现系统时所用到的一些关键技术。     

金沙江干热河谷台湾珍珠番石榴引种试种初报

台湾珍珠番石榴经在元谋金沙江干热河谷引种试验,表现速生、早结、丰产、抗逆性强,果大质优,供果期长,适应性强。     

武夷山风景名胜区景观空间格局研究

景观结构又称景观空间格局 ,是大小和形状不一的景观嵌块体在景观空间上的排列 (伍业钢等 ,1992 )。景观结构决定着景观功能 ,而功能的改变最终将从结构的变化中反映出来 ,因此 ,景观空间格局研究是景观生态学三大核心问题的核心 (贾宝全等 ,2 0 0 1)。景观异质性是景观最重要的属性之一 (Formanetal .,1986 ;Risseretal.,1984 ;Turner,1987) ,而景观空间格局既是景观异质性的具体体现者 ,同时又是多种生态过程在不同尺度上作用的最终结果 (贾宝全等 ,2 0 0 1)。景观空间格局及其变化和发展是自然、生物和社会要素相互作用的结果 ,影响着…     

油茶林生物量与养分生物循环的研究

对不同发育期油茶林生物量与养分的生物循环进行了研究。结果表明，从幼龄期至盛果期油茶林生物量逐步积累，盛果期生物量达到１６．１３９ｔ／ｈｍ２，其中经济生物量为１．７９８ｔ／ｈｍ２；不同发育期油茶林分的生产力不同，盛果期油茶林太阳能利用率最高，为０．２％；不同发育期油茶林光合产物在各器官的分配比例不同；不同发育期油茶林系统大量元素（Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ）的吸收量、存留量、归还量及输出量不同。并提出了油茶林系统施肥的监界量。     

不同产量类型雷竹林的激素、氨基酸及营养成分分析研究

通过对不同产量类型雷竹林植株及竹笋激素的分析,认为GA3和ABA调控着雷竹鞭侧芽的萌发,也就是影响着竹林的产量,而IAA和CTK对雷竹鞭侧芽的萌发没有明显的调控作用,但影响着竹笋的生长发育;通过对氨基酸含量的分析认为高、中、低雷竹林竹笋的氨基酸含量基本相同,但覆盖雷竹林的春季竹笋氨基酸含量明显下降;通过对竹笋营养成分的分析,得出蛋白质、N、P、K含量从高、中、低产林呈下降趋势,并还认为竹林中适当增施N肥有利于笋产量的提高。     

Function and value of water conservation in different age classes of Acacia mangium plantations

For this paper, we studied the water-holding capacity of canopy, vegetation layer under canopy and litter layer, the water-holding capacity and permeability of soil as well as their changes with growth of stands in Acacia mangium plantations of three different age classes (four-, seven-and 11-year-old). Results show that total water-holding above ground in the order of 11-year stand age (52.86 t/hm²)>seven-year stand age (41.90 t/hm²)>seven-year stand age (25.78 t/hm²), the increment tendency increased with stand age. Similar sequence also obtained on the water-holding capacity and permeation capacity of soil (0–40 cm). The total water-storage capacity both above ground and soil in four-year-old, seven-year-old and 11-year-old of A. mangium plantations were 2,023.0, 2,158.4 and 2,260.4 t/hm², respectively, and the all value of water conservation were 1,372.70, 1,474.42 and 1,549.91 yuan (RMB)/hm², respectively. Therefore, A. mangium plantation had a good ability to modify soil structure and good water conservation function. __________ Translated from Journal of Soil and Water Conservation, 2006, 20(5): 5–8, 27 [译自: 水土保持学报]     

立交匝道中桩及边桩坐标计算的新方法

以安楚高速公路某一立交匝道测设数据为例 ,给出坐标计算公式及编程思路 ,节省了坐标计算的时间及提高了计算数据的精度 ,为立交匝道放样提供了方便     

Post-fire habitat restoration of sables during winter season in northern slope of the Great Xing＇an Mountains

Habitat loss and fragmentation have been associated with the decline of endangered species. In 1987, a catastrophic fire in the northern Great Hing＇an Mountains of China, where the main habitat of sables （Martes zibellina） is located, aggravated the loss and fragmentation of the forest landscape. Due to restricted distribution and low population density, sables were listed in the national first-grade protected species in China. The objective of this paper was to identify to what extent the habitat of sables had been restored 13 years after the fire. Based on the behavioral data, which came from field survey information by radio-tracking, GPS （Global Positioning System） and forest inventory data, suitability habitat maps were derived using the Ecological Niche Suitability Model （ENSM）. In addition, the habitat structure was analyzed with selected landscape indices. Although forest cover mostly had been restored by 2000, the results indicated that, compared to the pre-fire situation, the areas of suitable habitat had been reduced significantly, especially those of less suitable, marginally suitable and moderately suitable designation. Fragmentation was aggravated, and suitable patches were found to be further isolated with the exception of those in most suitable areas. The ratio of the patch perimeter to area in unsuitable, moderately suitable and suitable areas decreased, while the ratios within other suitability types increased. Moreover, the percentage of soft boundaries decreased slightly, which can influence the redistribution of sables. The results above indicated that the suitable habitat had deteriorated, and the restoration of the sables＇ habitat remained to be done.     

Effects of VA mycorrhizae and Frankia dual inoculation on growth and nitrogen fixation of Hippophae tibetana

Through biological inoculation technology, the joint symbiosis of Tibetan seabuckthorn (Hippophae tibetana) in pure culture was identified and the effects of dual inoculation with Frankia and mycorrhizal fungi on the host plants in pot cultures were investigated. The results obtained from the comparative study showed that H. tibetana could form nodules and VA mycorrhiza both in pot and pure cultures. VA mycorrhizae and Frankia can stimulate the growth and the nitrogen fixation ability of host plants, respectively, yet the stimulation of the dual inoculation on the growth and nitrogen fixation ability of the host plants was more significant (p<0.05): stronger nitrogen-fixing ability, higher VA mycorrhizal development and better growth of seedlings in VAH and HR16 dual inoculation.     

温度调控对北方盆栽蓝莓开花的影响

以北方盆栽蓝莓美登和北蓝为研究对象,通过人为温度控制,促使盆栽蓝莓提前开花。研究表明,盆栽美登(Blomidon)在需冷量达到1200h,盆栽北蓝(Northern blue)在需冷量达到1000h情况下,可以通过温度调控,打破盆栽蓝莓休眠期,达到提前开花的目的。