热带作物学报2011，Vol.32Issue(1)：1-6,6.DOI:10.3969/j.issn.1000-2561.2011.01.001
不同树龄橡胶树枯落物养分归还比较
Nutrient Return in Fallitter of Hevea brasisiliensis at Different Age
摘要
Abstract
The account of fallitter and its content of mineral elements(N, P, K, Ca and Mg) of rubber trees(Hevea brasisiliensis) of clone PR107 at different ages from 4yr to 28yr , were determined, and the characters of falliter decomposing in different season and the effect of aging on decomposition and nutrient return of falliter were also analyzed. The main results showed that: (l)the average nutrient content, biomass and nutrient return of fall leaf were 0.841％, 2357.7(4a)～7392.3(24a)kg/hm2, and 147.4～498.6 kg/hm2, which were 1.69, 1.5～8.2, and 6.8-37 times than that of in fallbranch, respectively. During its 30 years productive period of rubber tree, the total biomass of fall leaf was almost 143 t/hm2, contributing onto mineral elements 6.01 t/hm2, and the fallbranch was 75 t/hm2,contributing onto mineral elements 1.94/hm2. Thereinto, the total N, P, K, Ca and Mg return from fallitter were 3.17, 0.14, 1.13, 3.04 and 0.48 t/hm2, respectively. (2)With increaseing of rubber trees' age, the biomass return of fallitter was increased accordingly. While the return for the 4-year-old tree , it was only 151.4 kg/hm2.a, that for the 24-year-old reached the highest, biggest biomass return with 431.40 kg/hm2.a at 24-year-old,. The order of mineral elements return was: N＞Ca＞K＞Mg＞P. (3)The return ratio of rubber tree was only 1.32％, at 4-year-stage,and became higher gradually along with age increaseing. It had the highest of 36.55％ at 24-year-old stage. In general, its order was: Mg＞Ca＞N＞K＞P.关键词
年龄/橡胶树/枯落物/养分归还Key words
Age/ Rubber tree/ Faflitter/ Nutrient return分类
农业科技引用本文复制引用
曹建华,陶忠良,赵春梅,蒋菊生,谢贵水..不同树龄橡胶树枯落物养分归还比较[J].热带作物学报,2011,32(1):1-6,6.基金项目
农业部科研所基本业务费项目"橡胶林生态系统数字化技术研究"(No.xisywfzx2008-23) （No.xisywfzx2008-23）
海南省自然科学基金项目"橡胶林生态系统养分循环及动态模拟研究"(No.070835). （No.070835）
