小兴安岭南坡4种林分类型枯落物水文特性研究

对小兴安岭南坡的红松林、落叶松人工林、杨树林和白桦林的枯落物储量、持水量、吸水速率等水文特征参数进行调查分析研究及其持水特性试验,结果表明,红松林下枯落物储量最大53.89 t/hm^2,其后依次为杨树林42.66 t/hm^2、落叶松人工林30.54 t/hm^2、白桦林最小20.03 t/hm^2。在这4种林分枯落物中,红松林的有效拦蓄量为最大,相当于14.56 mm的降雨。经数据分析拟合,得到林下枯落物未分解层和半分解层吸水速率与浸水时间之间存在显著的负指数相关性（R〉0.99）。     

南方优质米加工的降碎措施

南方优质米加工易碎,成本高,不利企业竞争.针对优质米生产加工中易产生碎米的原因,可从稻谷的品种、栽培、收购、储存、加工工艺和设备优化等方面入手,采取有效措施降低碎米率.     

南果北贮试验

北方土窑洞具有低而稳定的温度和适宜的湿度，有减轻柑桔褐斑病和“枯水”的良好效果，可将这两类贮藏期生理病害的损失率由２５％～５０％减少到５％～１０％。柑桔适当早采（提前７ｄ左右），可以提高贮藏保鲜的质量，减少贮期病害的发生。     

热带南亚热带地区优良珍贵阔叶树种选择与发展

分析了优良珍贵阔叶树的用途、适应性、经济效益、生态效益和社会效益等因素，探讨热带、南亚热带地区优良珍贵阔叶树种的选择，并提出发展优良珍贵阔叶树种时存在的问题和应对措施。     

华南虎哺乳期母幼行为的初步研究

对梅花山华南虎繁育研究所内 4号母虎及其所产幼虎的母幼行为进行了初步研究 ,着重描述了华南虎母幼的各种行为 ,并对其中的一些行为作了初步探讨。母幼间接触的部位主要是头部等感官较敏感区域 ,通过各种接触是建立母幼友好、亲昵关系的主要途径。母虎主要通过哺乳、舔、嗅等行为与幼虎接触 ,其次是拱、衔、护幼行为等 ;而幼虎主要是通过吮乳、舔、嗅闻与母虎接触 ,其次是叫等方式     

宁南山区退耕还林(草)存在的问题及可持续发展途径

宁南山区在实施退耕还林 (草 )工程中 ,针对在总体目标中的综合治理及治理目的等问题 ,结合宁南山区退耕还林 (草 )工作的实际 ,探讨性地提出适地适树适生境、充分发挥现代科技的作用、严格计划生育政策以及建全政策保障体系等建议。     

南方集体林区林权制度改革研究

系统分析南方集体林区存在的产权问题,提出改革的主要内容:1)林权明晰化包括明确林地所有权主体,完善林地所有权的委托代理关系;构建经营权的委托代理关系,明确所有者与经营者之间的权利与义务;科学界定林地使用权和林木所有权主体.2)林权的安全性包括改革林地征用补偿制度;建立公益林征用(管制占用)补偿制度;改革商品林采伐限额制度;改革不合理的林业税费政策.3)林权的市场化运作包括降低交易成本;加强森林资源资产评估工作;提升林权交易需求的动力机制;激活林权交易市场的供给机制.     

浅析现代都市建筑群对中国江南园林的影响

作者从天际轮廓线、视觉通廊、空间格局等方面分析了现代都市建筑对江南园林的影响,并提出了一些合理化建议,以期得到城市规划、园林管理部门以及社会各界的广泛关注。     

Capacity of Stem Water Conductivity for Two Eucalyptus (Eucalyptus urophylla) Plantations in South China

The sap flux density (SFD) was used as a measure of water capacity through stems of eucalyptus in this paper. It was found that daily SFD increased with daily vapor pressure deficit (VPD) in nonlinear regression Y = AX³ + BX² + CX + D (R² = 0.702 1, n = 135, p = 0.01) at both sites (Hetou and Jijia) in the Leizhou Peninsula, Guangdong Province, China, where Y was daily SFD, X was mean daily VPD, A, B, C, D were constants. But extremely high VPD might limit stem water conductivity. The environmental factors, such as air vapor pressure deficit (VPD), solar radiation (RAD), etc., were the main determinants of SFD for E. urophylla plantations. The upper threshold of diurnal SFD was 51.55–55.65 mL•cm^–2•h^–1 under the selected extremely high environmental conditions.     

Truffle abundance and mycophagy by northern flying squirrels in eastern Washington forests

Although much is known about truffle abundance and rodent mycophagy in mesic Douglas-fir forests in the Pacific Northwest, few data are available for dry interior montane forests dominated by ponderosa pine (Pinus ponderosa), Douglas-fir (Pseudotsuga menziesii), and grand fir (Abies grandis). Our objective was to quantify the relationship between the abundance and diversity of ectomycorrhizal fungal sporocarps in the soil and in the diets of northern flying squirrels (Glaucomys sabrinus) in low-elevation forests of the eastern Washington Cascades. We randomly sampled four stands each of three cover types: dry open ponderosa pine, mesic young mixed-conifer forest, and mesic mature mixed-conifer forest. We sampled the soil for hypogeous sporocarps during the spring of 1999 and 2000. We collected fecal pellets from 318 flying squirrels live-trapped during the fall of 1997–2000. We sampled 2400 m² of soil surface and found truffles in 40% of 600 plots. Total biomass collected was 609 g. Spring truffle biomass on a kg/ha basis averaged 1.72 in open pine, 3.56 in young, and 4.11 in mature forest. Twenty-two species were collected across all cover types, with all but three species belonging to the Basidiomycotina. Eleven dominant species accounted for 91–94% of truffle biomass in each cover type. Four dominant species accounted for 60–70% of spring truffle biomass: Gautieria monticola, Hysterangium coriaceum, Rhizopogon parksii, and R. vinicolor. Truffle assemblages, richness and total biomass differed among cover types: richness and biomass were highest in young and mature mixed-conifer forest, and lowest in open ponderosa pine forest. Fall squirrel diets were composed of 23 genera or groups of fungi, plus about 22% plant material. Rhizopogon was the most abundant genus in the diet, followed by plant material, then Gautieria, Leucogaster, Alpova, and Hysterangium. Diets in different cover types were similar in the composition, richness, evenness, and the ratio of fungus to plant material. Diet richness varied over the study period. Nineteen truffle genera were detected in fall fecal samples versus 12 in spring soil samples. Management of low-elevation dry forest to maintain or restore stable fire regimes might reduce truffle diversity at stand scales by simplifying stand composition and structure; but, such management might increase long-term beta and landscape truffle diversity and persistence by reducing the occurrence of high-intensity fires and stabilizing inherent fire disturbance regimes.