摘要
文章对泡桐各器官营养元素含量及其吸收循环规律进行了研究。揭示了泡桐在大生育周期和年生育期内的养分吸收循环规律：①泡桐对营养元素的吸收量随树龄的增大而增加；②泡桐各器官对营养元素吸收多少依次为叶＞枝＞花＞干＞根；③泡桐对各营养元素吸收量的多少依次为Ｎ＞Ｋ＞Ｐ；④泡桐各器官对营养元素有选择吸收作用；⑤泡桐营养元素的吸收主要集中在７月底之前；⑥泡桐营养元素的循环率为６７３４％。
The nutrient element content,uptake and cycling of each Paulownia organ are studied in the paper.Results are highlighted as following: 1)Nutrient uptake of Paulownia increases with the increase of tree rings; 2)the amount of nutrient uptakes from different organs of Paulownia follow the order of foliage>branches>flowers>stems>roots; 3)the uptakes of different nutrient elements follow the sequence of N>K>P; 4)different organs of Paulownia show selective uptake and retension of nutrient elements; 5)annual nutrient uptake of Paulownia mainly concentrates between the period of initial growth and the end of July;and 6)the circulation ratio of nutrient is 67.34%.
出处
《资源科学》
CSCD
北大核心
1999年第2期62-70,共9页
Resources Science
基金
中国科学院封丘农业生态开放实验站开放基金
关键词
泡桐
营养元素
循环率
营养吸收
Paulownia
Nutrient element
Circulation ratio
