期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
秃杉持续生长力的探讨 被引量:5
1
作者 孙志刚 陈强 +6 位作者 苏俊武 许彦红 刘永刚 王庆华 刘云彩 周筑 孙宏 《安徽农业科学》 CAS 2019年第5期116-119,共4页
[目的]探讨秃杉生长特点及其持续生长力,为我国大径级用材林培育树种选择及秃杉大径材培育提供科学参考。[方法]通过对秃杉自然分布区天然林及周边人工林的调查,从秃杉的长寿性、枝叶空间分布、根系连生、中幼林施肥效应、单株和林分生... [目的]探讨秃杉生长特点及其持续生长力,为我国大径级用材林培育树种选择及秃杉大径材培育提供科学参考。[方法]通过对秃杉自然分布区天然林及周边人工林的调查,从秃杉的长寿性、枝叶空间分布、根系连生、中幼林施肥效应、单株和林分生长力等方面探讨了其生长力。[结果]秃杉寿命达上千年,数百年生仍然生机勃勃,其主干圆满通直,侧枝细而柔软,下部枝条易向下倾钭生长,增大了光合作用面积,部分秃杉下部侧枝还能向树冠间的空隙处旋转生长,根系连生形成庞大的根系群体结构和菌根,保障了秃杉的生长力,10余年生以后不施肥树高和胸径年平均生长量仍可达0.82 m和1.95 cm,年龄在24~50年的优良木,平均树高和胸径年均生长量达0.71 m和1.72 cm,100年生以内平均胸径年均生长量仍然可达1 cm以上,人工林的蓄积量在21~30年达443.56 m^3/hm^2,51~60年达1 231.43 m^3/hm^2。[结论]秃杉的速生时间达50~100年,是一个速生阶段持续性特别长的树种,是培育大径材的理想树种。 展开更多
关键词 秃杉 大径材 持续生长力 空间分布 连生根系
下载PDF
What Life Is and How It Originated
2
作者 William Day 《Journal of Philosophy Study》 2013年第10期895-904,共10页
This paper refutes the mechanistic interpretation of cellular dynamics and contends that the life-giving principle is sustained growth a biological system and is uninterrupted growth balanced in a dynamic state by syn... This paper refutes the mechanistic interpretation of cellular dynamics and contends that the life-giving principle is sustained growth a biological system and is uninterrupted growth balanced in a dynamic state by synthesis and dissolution. The process began by an oxidation/reduction reaction on the surface of pyrite energized photovoltaically by sunlight. Hydrogen sulfide was oxidized, carbon dioxide was reduced, and phosphate on the surface of the pyrite was a reactant. The first organic compounds were sulfides and phosphoglycerates. These organophosphates were at the center of the energy cycle of all life where the dehydration of a relatively unreactive "low-energy" two-phosphoglycerate transforms it into the "high-energy" phosphoenolpyruvate. Life began as a growth process and continues to grow ceaselessly out of necessity. It cannot discontinue the life-giving energy flow without irreparable loss of the process. All forms of life past and present were and are stabilized systems in which the growth process is contained in metabolic turnover. 展开更多
关键词 origin of life life principle metabolic turnover
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部