sitka spruce

In this paper, spatial and terporal variation process and law of unsaturated soil water on soil profile and horizontal direction under Sitka spruce forest in North Wales were approached using the tensionmeter technique.

本文论述了北威尔士北美云杉林〔Ｐｉｃｅａｓｉｔｃｈｅｎｓｉｓ（Ｂｏｎｇ）Ｃａｒｒ〕土壤非饱和水在土壤剖面上的垂直和水平方向的时空变化过程及规律。

Development and current status of art program applied to medicine in North America;

北美医学美术专业的发展和现状

The Development Of Car-sharing In North America;

北美小汽车共用的发展状况

Physiological indices of Plantago virginica at different population densities and their significance of adaptation to environments;

北美车前不同种群密度下的生理指标及其适应意义

Fractal Analysis of Distribution Patterns of Plantago virginica and P. asiatica.;

北美车前(Plantago virginica)和车前(P.asiatica)分布格局的分形分析

Influences of Population Density of Plantago virginica on Its Morphological Characters of Underground and Aboveground Organs;

北美车前的种群密度对地上和地下器官形态的影响

Analysis of Main Factors Affecting the Rooting Ability of Sequoia sempervirens Cuttings;

北美红杉扦插生根的影响因素分析

Study on Rootage Ability of Various Individuals Inter-inarching of Sequoia sempervirens;

北美红杉不同个体间插穗生根能力的研究

Growth Response of Sequoia sempervirens Seedlings to N Nutrients;

北美红杉幼苗对不同供N水平的生长反应