川中丘陵区桤柏混交林土壤有机质的时空动态  

Spatial and temporal dynamics of soil organic matter of the mixed plantations of alder and cypress in the hilly areas of central Sichuan Basin

作　　者：吴鹏飞[1] 朱波[2] 

机构地区：[1]西南民族大学生命科学与技术学院,四川成都610041 [2]中国科学院成都山地灾害与环境研究所,四川成都610041

出　　处：《西南农业学报》2008年第4期1024-1028,共5页Southwest China Journal of Agricultural Sciences

基　　金：中国科学院知识创新工程项目(KZCX3-SW-330);国家重点基础研究发展计划(2003CB415202);西南民族大学项目

摘　　要：本文对川中丘陵区的10、15、20、25a桤（Aluns cremastogyne）柏（Cupressus funebris）混交林（MPAC）和30a纯柏林的土壤（0-15cm和15～30cm）土壤有机质（SOM）的时空间分布特征的研究，结果表明：①不同年龄段SOM的空间分布的差异性也各不相同，在15a左右各样地的SOM含量无显著地差异（P〉0．05），20a阶段差异极显著（P〈0．01），25a时仅有亚表层存在显著差异，30a纯柏林阶段无显著差异（P〉0．05）；②在桤柏混交林的生长过程中，SOM含量在158之前显著增加（P〈0．01），15a后呈缓慢下降趋势；30a纯柏林阶段，0—15cm和15—30cm的SOM含量分别比10a的显著增加了80．38％和78．42％，但比15a的显著下降了29．16％和53．37％。SOM动态表明桤柏混交林的土壤肥力在空间上存在异质性，且随人工林的发育呈现先增加后下降的变化趋势。The investigations were conducted on thel 0,15,20 and 25-year-old mixed alder （Aluns cremastogyrne ） and cypress （ Cuprezsus funebr/s） plantations and a 30-year-old pure cypress plantation, developed from the mixed plantations, in Hilly Area of Central Sichuan Basin, to estimate the temporal and spatial distributions of soil organic mater （SOM）. The results showed that： （i） the spatial distribution of SOM among different sites at the same age stage were not significant （ P 〉 0.05 ） before 15-year-old, but significant at 20-year-old age stage （ P 〈 0. 01 ） ,and not significant （P 〉0.05 ） again after 25-year-old age stage; （ii） During the development of the mixed plantations,the SOM contents increased sharply （ P 〈 0.01 ） from 10- to 15 -year-old, and declined gradually from 15- to 30 -year-old ; The SOM contents, in 0 - 15 cm and 15 -30 cm layers of the 30-year-old pure cypress plantation,were 80.38 % and 78.42 % higher than that of the 10-year-old mixed plantations,respectively ,but 29.16 % and 53.37 % lower than that of 15-year-old mixed plantations. The temporal and spatial dynamics of SOM in the mixed alder and cypress plantations indicated that soil fertility was heterogeneous in the Hilly Area of Central Sichuan Basin, and changed with the development of the mixed alder and cypress plantations.

关 键 词：川中丘陵区 桤柏混交林 纯柏林 土壤有机质 时空动态 

分 类 号：S714.2[农业科学—林学]