basal area meaning in English
底面积；基域。
Examples
- Numerous small rounded dark brown or black necrotic patches in green leaves ; patches often in groups or rows close to midrib or major lateral veins , towards centre or basal areas of leaflects ; petioles green and healthy
缺锰的马铃薯叶片：叶片上有大量深褐色或黑色坏死小圆斑，叶的主脉或大部分侧脉附近有条状斑纹，向叶中部和基部扩散，叶柄正常并保持绿色。 - Form . taxus chinensis var . mairei is protecting plant in the first class , which is a precious and endangering plant in china in this paper , the quantitative characterics of form . taxus chinensis vsr . mairei population including age structure , spatial distribution pattern , growth dynamics of tree basal area , niche characterics , fractal dimension and competition between specises were studied using methods of mathematics ecology from the angle of population ecology of form . taxus chinensis var . mairei , then the prent state and the endangering causes were analysed . this research offers gist to protecting and enlarging the crude resourse of form . taxus chinensis vsr . mairei population , afforesting plantation and sustainable utilize for us
本文从南方红豆杉种群生态学的角度、主要应用数学生态学的方法探讨南方红豆杉种群的数量特征，包括南方红豆杉种群年龄结构、种群空间格局(探讨分布格局动态规律与生境相互关系) 、不同立地条件下种群优势度增长趋势、生态位宽度、生态位相似比例、生态位重叠、空间占据能力及种间竞争等，分析其目前现状及濒危原因，期望为南方红豆杉野生资源的保护和扩大、营造人工林及可持续利用提供理论基础，也为濒危植物种群生态学的研究提供参考。 - The growth dynamics of tree basal area of form . taxus chinensis var . mairei population in different altitude were discussed using the liu - logistic model , and the results showed that the altutide of 790 meters is more suitable to the survive of form . toms chinensis var . mairei population than 990 meters . plot sampling was selected and dynamic analysis was used to study the height structure of taxus chinensis var . mairei population , and the quadrate picture of height structure and the curve of survival rate were drew
运用改进模型对南方红豆杉种群在不同海拔梯度的种群优势度增长进行了探讨，表明海拔790m处的南方红豆杉具有较大的环境容纳量，但增长速度不快，海拔990m处的南方红豆杉种群环境容纳量不高，但具有较大的增长速度，这可能与群落的发育阶段不同有关，两地海拔均为南方红豆杉适宜的生长海拔高度，相比而言，海拔790m的珍稀濒危植物南方红豆杉种群数量特征的研究高度更宜于南方红豆杉种群的生长。 - Taxus chinensis vsr . mairei population is very oblivious from seeding stage to mature tree stage . the patterns were consistant with the ecological and biological characteristics of form . taxus chinensis var . mairei which were valuable and rare and in severe danger . in this paper , logistic model and liu - logistic model were proposed to approach the growth dynamics of tree basal area of form . taxus chinensis var . mairei population
南方红豆杉幼苗表现为较强的聚集分布，除与种子的散布有关外，生境条件的差异是重要原因之? ，其它发育阶段表现为明显的随机分布，表明它在自然群落中分布的概率很小，反映了南方红豆杉珍稀濒危的生态生物学特性和特征。 - Yellow - green or yellow chlorosis or brown necrosis in basal areas of older and expanding leaves ; margins curled downwards and leaf expansion irregular and suppressed ; chlorosis and necrosis spreading into interveinal areas of older leaves ; youngest leaves distorted , necrotic and failing to expand ; petioles truncated ; death of stem growing point
西葫芦缺硼:老叶和正展开叶的基部黄绿色或黄化或变褐坏死,边缘向下卷曲和叶片展开不规则和抑制,色斑和坏死斑散布在老叶叶脉间,心叶扭歪、坏死、无法展开,茎生长点枯死