亚高山岷江冷杉林粗木质残体对土壤碳氮磷化学计量比的影响  

Effects of coarse woody debris on soil C:N:P stoichiometry in a subalpine Abies faxoniana forest

作　　者：郑冰倩 曹瑞 王壮 王芝慧 武启骞 杨万勤 ZHENG Bingqian;CAO Rui;WANG Zhuang;WANG Zhihui;WU Qiqian;YANG Wanqin(College of Forest and Biotechnology,Zhejiang A&F University,Hangzhou 311300,China;School of Life Sciences,Taizhou University,Taizhou 318000,Zhejiang,China)

机构地区：[1]浙江农林大学林业与生物技术学院,杭州311300 [2]台州学院生命科学学院,浙江台州318000

出　　处：《应用生态学报》2024年第11期2975-2982,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(32071554,31570445)资助。

摘　　要：为探究粗木质残体分解如何影响土壤碳和养分平衡,本文以亚高山岷江冷杉林为研究对象,以离粗木质残体至少1 m处无粗木质残体覆盖土壤为对照,研究了10~30、30~50 cm径级和Ⅰ~Ⅴ腐解等级岷江冷杉粗木质残体下0~10 cm土壤有机碳、氮、磷含量及其化学计量比特征。结果表明:粗木质残体显著提高土壤有机碳(114.1%~412.2%)、氮(0.1%~198.0%)含量及碳氮比(61.7%~117.1%)、碳磷比(379.6%~931.1%)和氮磷比(206.3%~532.6%),显著降低土壤磷含量(28.1%~70.9%)。粗木质残体对土壤有机碳、氮、磷含量的显著影响取决于腐解等级和径级。Ⅲ和Ⅳ腐解等级的大径级粗木质残体下土壤有机碳和氮含量显著高于小径级粗木残体质下土壤。Ⅲ腐解等级的大径级粗木质残体下土壤磷含量显著高于小径级粗木质残体下土壤。大径级粗木质残体下土壤碳氮磷生态化学计量比与粗木质残体碳氮磷含量的相关性显著。大径级粗木质残体在分解中后期更有利于维持土壤养分。To elucidate the regulatory effects of decaying coarse woody debris on soil carbon and nutrient balance,we measured soil organic carbon,nitrogen,and phosphorus contents and stoichiometric ratios in the topsoil(0-10 cm)beneath Minjiang fir(Abies faxoniana)coarse woody debris of decay classesⅠ-Ⅴ,with diameter of 10-30 cm and 30-50 cm in a subalpine coniferous forest.Areas without coarse woody debris situated at least 1 m away from the debris were set as control.The results showed that decaying coarse woody debris significantly increased contents of soil organic carbon(114.1%-412.2%)and nitrogen(0.1%-198.0%),as well as C/N(61.7%-117.1%),C/P(379.6%-931.1%)and N/P(206.3%-532.6%)in soils,but significantly udecreased soil phosphorus content by 28.1%-70.9%.The effects of coarse woody debris on soil organic carbon,nitrogen,and phosphorus content varied with decay classes and diameters.The content of organic carbon and nitrogen in soils beneath large diameter coarse woody debris at decay classesⅢandⅣwere significantly higher than those beneath coarse woody debris with small diameter.Soil phosphorus content beneath large diameter coarse woody debris at decay classⅢwas significantly higher than that beneath small diameter.Moreover,ecological stoichiometric ratios in soils beneath large diameter coarse woody debris exhibited significant correlations with organic carbon,nitrogen,and phosphorus content of coarse woody debris.In conclusion,retaining larger diameter coarse woody debris with medium to highly decayed classes on the forest floor is beneficial for soil nutrient balance.

关 键 词：岷江冷杉 粗木质残体 土壤养分 生态化学计量比 

分 类 号：S714.2[农业科学—林学]