长白山阔叶红松林群落的细根现存量及养分内循环  

Fine Root Mass and Internal Nutrient Cycling in a Broad Leaved-Korean Pine Forest Community of the Changbai Mountain

作　　者：王存国[1,2] 韩士杰[1] 周玉梅[1] 张军辉[1] 张岩[1] 徐媛[1,2] 王树堂[1,2] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院研究生院,北京100049

出　　处：《林业科学》2012年第3期148-153,共6页Scientia Silvae Sinicae

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-416);国家自然科学基金重点项目(40930107)

摘　　要：细根（直径≤2mm）是植物吸收水分和养分的重要器官,细根通过呼吸作用和周转过程向土壤输送有机质（Jackson et al.,1997;王政权等,2008）。细根生物量虽然仅占植物体总生物量的5%左右,但由于细根生长和周转迅速,其生长量可占森林初级生产力的50%～75%（Nadelhoffer et al.,1992）。Since fine roots are an important nutrient source and sink in terrestrial ecosystems, fine root mass, the contents of C, N, P and K, as well as their ratios, are crucial information for understanding forest ecosystem nutrient cycling. Biomass, neeromass, and C, N, P, K contents in fine roots in the different soil layers were investigated in a broadleaved Korean pine forest community of the Changbai Mountain during growing season （June to October）. Significant seasonal changes in fine root biomass and necromass were observed, with the highest fine root biomass of 6.00 t.hm2 occurred in August and the highest necromass of 2. 16 t.hm2 in September. The K content in live fine roots and N content in dead fine roots also exhibited significantly seasonal changes, with the highest K content of 7.17 mg＇g1 in September and the highest N content of 14.44 mg.g in August. The fine root biomass, necromass, and N, K and N： P in live fine roots in 0 10 cm soil layer were higher than those in 10 20 cm soil layer, but the C： N ratio was opposite. There was no significant difference in nutrients of dead fine roots between 0 10 cm and 10 20 cm soil layer. The P and K contents in live fine roots were significantly higher than those in dead fine roots, and the internal cycling rates were 7. 26% and 33.11% , respectively. No significant difference in C and N contents was found between live fine roots and dead fine roots.

关 键 词：阔叶红松林 细根现存量 养分内循环 

分 类 号：S718.54[农业科学—林学]