四川省2种生境条件下黑麦草种子生产性能的研究

对四川省的丘陵区(洪雅)和中山地区(汉源)2种生境条件下的黑麦草种子生产性能进行了研究分析,结果表明,试验两地的种子产量和质量均有显著差异.其中,洪雅点种子产量为244.0 kg/hm2,汉源点的种子产量为532.8 kg/hm2.两样地的种子质量相比,汉源点的发芽势、发芽率、四唑染色数和四唑脱氢酶均高于洪雅点.两地的种子产量与其构成因素的相关性基本一致,均呈显著相关;相关性强弱依次为:每生殖枝种子数>生殖枝数>每生殖枝小花数>分蘖数>每生殖枝小穗数>千粒重.每生殖枝种子数对种子产量贡献最大.     

红树林海岸生物多样性专项库的设计

为了加强对红树林生态环境保护的宣传力度，增强图书馆对外服务的功能，满足对红树林海岸生物多样性信息编目、分类等资料管理需求，采用目前先进的Web技术、数据库技术、数据处理技术构建了红树林海岸生物多样性信息管理系统，较为详细地讨论了构建专项库的意义以及关键技术。     

珠海市淇澳岛红树林引种扩种问题的探讨

文章论述了珠海淇澳岛引种扩种红树植物的重要意义；分析了引种无瓣海桑对红树资源的恢复，物种多样性和林分质量的提高，乡土植物的天然更新和扩散，大米草的控制等作用；并探讨了无瓣海桑引种对生态的影响。最后还提出了红树林引种扩种需要加强的措施。     

论攀西地区野生经济真菌生态习性及其与林业建设的关系

四川省攀西地区自然条件优越，植被类型多样，林地资源充足，茵物资源丰富，有着发展经济真菌的优越条件，特别是近年来的林业工程建设为野生经济真菌的生产提供了基本物质基础，为其扩大生产创造了条件。文章列出了该地区常见的有重要经济价值的食药用真菌（分别归入22科、36属）及其生态习性，指出在林业工程建设中应对经济真菌生产给予足够的重视，并提出了相应的策略。     

广州市红树林资源现状及其保护利用对策

概述了广州红树林资源现状,分析了广州市红树林资源保护工作中急需解决的主要问题,并提出解决问题的相关建议。     

海南岛清澜港红树树种适应生境能力与水平分布*

红树植物的器官形态变异反映了它们对于不同潮间带生境的适应能力，灰色聚类分析结果表明杯萼海桑、海桑、正红树属于适应潮间带生境能力强的种类，木榄、海莲属于适应潮间带生境弱的种类。适应能力强者在低、中潮滩组建群落，适应能力低者在高、中潮滩组建群落。随潮间带淤积升高，适应能力强者不断向外占领裸滩，适应能力弱者不断侵入适应能力强者的迹地。     

红树植物地面反射光谱特征研究

结合使用野外便携式光谱仪对九龙江口红树林保护区白骨壤、秋茄、桐花树3种红树植物的叶冠表观光谱的测量结果,系统分析比较了红树植物叶冠反射光谱特征及其差异;并在一个潮间带底质遥感信息处理平台上对研究地点进行基于表观光谱特征的白骨壤和秋茄的SPOT卫星遥感图像分类;最后讨论了红树光谱研究中存在的问题。     

Severe hail damage to mangroves at Port Curtis, Australia

A hailstorm in October 1994 was found to have moderately or severely impacted on 5.3% of the mangrove forests in Port Curtis. All mangrove species showed evidence of hail damage, including the three most common species (Rhizophora stylosa, Ceriops tagal and Avicennia marina). Physical effects of hail damage included stripping of leaves from plants, holes punched through leaves, bruising to bark, divots removed from bark, branch and plant death. Speciesspecific differences in vulnerability to the effects of hail were observed with C.tagal experiencing relatively higher mortality rates than the other two common mangrove species. A delayed pattern of mortality was observed in two species _ C.tagal and A.marina. Alterations to mangrove community structure included: (1) reductions in stem density, stem diameter and basal area, (2) reductions in canopy cover (based on a photographic index of foliage projective cover) and (3) changes in relative abundance of species in mangrove zones. Recovery was observed in some stands but others had not recovered to prehail levels of canopy cover two years after the hailstorm. Recovery had occurred by regeneration of fresh leaves but no recruitment of young plants had been observed during the study. The forests in the impact area were dominated by either Ceriops tagal or Rhizophora stylosa with Avicennia marinaas a subdominant in places. C.tagal dominated forests within the impact area were relatively more severely affected (41.8% in the severe category) than R.stylosa dominated communities (only 17.4% in the severe category). This indicated that C.tagal dominated forests were more vulnerable to the effects of hail damage than R.stylosa dominated forests. In addition, hailimpacted C.tagal dominated forests represented a relatively high percentage of the area of C.tagal dominated forests in Port Curtis (44.3%). This percentage was much higher than hailimpacted R.stylosa dominated forests in Port Curtis (2.7%). These two factors – relatively severe impact on C.tagal communities and a relatively higher percentage affected within the Port Curtis area – illustrate that hailstorms, as a form of natural disturbance, are an important influence on the forest ecology of mangrove ecosystems in this region.     

Vegetation and its relation to soil nutrient and salinity in the Calabar mangrove swamp,Nigeria

The study examines vegetation – environment relationships. Vegetation measurements included species frequency, density, diameter and tree height, while environmental measurements were soil particle size distribution, acid properties (pH, Al, SO₄), nutrient cations (Ca, Na, Mg, K), organic carbon, nitrogen, phosphorus and chloride content. Nypa fruticans was the dominant species in the A stratum (> 3 m tall) while Rhizophora mangle was dominant in the B stratum (1–3 m tall). The C stratum (< 1 m tall) was dominated by mangrove, Nypa and Raphia saplings. Silt was dominant and the most variable particle size fraction. A principal components analysis of the soil data indicated the first three dominant components influencing the vegetation were salinity, nutrient and soil texture. Tree height and density correlated highly with the salinity and soil texture gradients (P < 0.01), while basal area correlated with salinity and nutrient gradients (P < 0.01). While Avicannia africana in the A stratum was influenced largely by the salinity and soil texture gradients. Nypa fruticans in the B stratum was influenced by salinity and nutrients.     

Spatially Explicit Evaluation of Local Extractive Benefits from Mangrove Plantations in Bangladesh

Mangroves worldwide provide a wide range of ecosystem services utilized directly and indirectly by local peoples. Between 1966 and 2001, Bangladesh established approximately 148,000 ha of mangrove plantations in coastal areas within the Barisal and Chittagong Divisions. Though erosion and human encroachment and conversion have removed over two-thirds of these stands, the Forest Department has continued to undertake new plantation activities.

To investigate how and to what degree people directly utilize these mangroves, I conducted 340 household surveys across eight coastal villages located in close proximity to established plantations. The predominant direct use of the mangrove plantations by local rural communities is the extraction of detritus and nonmain stem material (e.g., limbs, leaves) for combustible fuel. This study uses household foraging distances to estimate and map net value densities based on reported market prices of extracted goods. The average extractive value of mangrove plantations is Tk 2,300 ha^?1 yr^?1, ranging among the villages from 300 to Tk 27,400 ha^?1 yr^?1, with values concentrated closer to the village. Cost-benefit analyses suggest that direct use values alone have justified the establishment and management of previously planted stands. However, other indirect values must be taken into account if these areas are to merit additional plantations.