摘要
用土钻法研究了杉木(Cunninghamialanceolata)、火力楠(Micheliamaclurei)纯林和混交林的细根分布,用分解袋法研究了杉木和火力楠细根的分解,计算了3个林分中细根分解的N,P,K,Ca,Mg的归还量。活细根的垂直分布以火力楠纯林层次性最强,混交林次之,杉木纯林最差。火力楠细根的养分含量比杉木细根高,而C/N比低。火力楠细根年分解率比杉木快,火力楠为57.7%,而杉木为32.78%。细根分解的养分归还量多少顺序依次为:火力楠纯林、杉木火力楠混交林和杉木纯林。混交林中,细根分解的N,P,K,Ca和Mg归还量分别为枯枝落叶的33.38%,5.82%,269.33%,34.12%和376.08%。细根在3个林分的物质循环和周转中起着不可忽视的作用。
Soil corer was used to investigate the distribution of fine
root and a traditional method of nylon litter bag to measure the decomposition in pure
Cunninghamia lanceolata and Michelia macclurei var Sublanea ,and the mixed
plantations.Nutrient returns of N,P,K,Ca and Mg in the above three plantations were estimated
based on the decomposition experiment.The vertical distribution of live fine root for pure
M.macclurei stand was the most superficial,the mixed stand was intermediate,pure
C.lanceolata was the least.The fine root of M.macclurei decomposed more quickly than that
of C.lanceolata because of its higher original nutrient content and lower C:N ratio.Nutrient
return from fine root was largest in pure M.macclurei ,the mixed stand intermediate,and pure
C.lanceolata the least.In the mixed stand,returns of N,P,K,Ca and Mg from fine root
decomposition were 33 38%,5 82%,269 33%,34 12% and 376 08% of that from decomposition
of leaf and twig litter respectively.It is suggested that fine root plays an important role in
nutrient cycling of the stands.
出处
《生态学报》
CAS
CSCD
北大核心
1999年第3期342-346,共5页
Acta Ecologica Sinica
基金
中国科学院重中之重项目
中国科学院‘陆地生态系统痕量物质生态过程’开放实验室资助