Ponderosa Pine Seed Source Test in Nebraska in the Central Great Plains of the United States

Ponderosa pine (Pinus ponderosa Laws) has been planted widely in the Great Plains for wind breaks. A 1968 study recommended using material from south-central South Dakota and north-central Nebraska. A second test to further delineate seed sources (families) from numerous collection sites in this region was established in 1986. This paper reports results for survival, height, diameter, and D2H (diameter squared X height) measurements at 15 years. Results identify a wide range of suitable families within the region. A majority of the tested sources performed well, thus verifying the original recommendations.

博华广场

博华广场坐落于静安雕塑公园与自然博物馆旁,在构思这座60层的高品质办公楼时,来自美国的开发商汉斯,对设计团队提出的规划愿景是要充分发掘静安区丰富的城市肌理,为该区域未来的开发树立可持续设计的典范。Gensler的设计团队充分利用了项目独一无二的地理位置、现有的公共交通网络,以及邻近的公园景观资源,克服了相邻轨道交通建设对建筑设计与施工进度带来的巨大挑战。创新性的幕墙设计方案,降低了传统幕墙对周边建筑以及居民的影响。